Updated on 2022/09/25

写真a

 
UEMICHI, Akane
 
Affiliation
Faculty of Science and Engineering, School of Creative Science and Engineering
Job title
Associate Professor(tenure-track)

Concurrent Post

  • Faculty of Science and Engineering   Graduate School of Creative Science and Engineering

Research Institute

  • 2020
    -
    2022

    理工学術院総合研究所   兼任研究員

Education

  • 2011.04
    -
    2013.11

    University of Tsukuba   Graduate School of Systems and Information Engineering   Doctoral Program in Engineering Mechanics and Energy  

  • 2009.04
    -
    2011.03

    University of Tsukuba   Graduate School of Systems and Information Engineering   Master's Program in Engineering Mechanics and Energy  

  • 2005.04
    -
    2009.03

    University of Tsukuba   College of Engineering Systems  

Degree

  • 2011.03   University of Tsukuba   Master (Eng.)

  • 2013.11   University of Tsukuba   Ph.D.

Research Experience

  • 2020.04
    -
    Now

    Waseda University   Faculty of Science and Engineering   Associate professor

    Department of Modern Mechanical Engineering

  • 2019.03
    -
    2020.03

    Tokyo University of Agriculture and Technology   Graduate School of Engineering   Assistant Professor

  • 2014.04
    -
    2019.03

    The University of Tokyo   Department of Mechanical Engineering   Assistant Professor

  • 2013.12
    -
    2014.03

    JSPS   Fellow(PD)

  • 2012.04
    -
    2013.11

    JSPS   Fellow (DC2)

Professional Memberships

  •  
     
     

    SOCIETY OF AUTOMOTIVE ENGINEERS OF JAPAN

  •  
     
     

    JAPAN SOCIETY OF ENERGY AND RESOURCES

  •  
     
     

    The Japan Society of Mechanical Engineers

  •  
     
     

    Combustion Society of Japan

  •  
     
     

    The Society of Instrument and Control Engineers

 

Research Areas

  • Control and system engineering   Energy System Mechanics

  • Fluid engineering   Fluid-induced vibration

  • Thermal engineering   Energy equipment and system modeling

Research Interests

  • Energy System Mechanics

  • Fluid interaction vibration

  • Distributed energy system

  • Combustion

Papers

  • Practical Method for Optimizing Capacities of Private Generators Installed in Hospital Buildings During Power Outages

    Akane Uemichi, Naoki Kaito, Yudai Yamasaki, Shigehiko Kaneko

    Journal of Energy Resources Technology   145 ( 2 ) 022105  2023.02

    Authorship:Lead author, Corresponding author

     View Summary

    Abstract

    In stand-alone operations, on-site generators must balance and meet demand at any time for second-by-second fluctuations in output and load demand. However, the previous optimization tool for private generator configuration in hospital buildings did not consider demand sufficiency. Herein, this qualitative electricity problem was solved by proposing a new optimization method that considers the balance of power supply and demand in the stand-alone operation of on-site generators during power outages. As a demand sufficiency condition, a power balance simulator obtained available configurations of private generators that can be operated within the standard alternating current (AC) frequency range of 49-51 Hz. We also compared case study results by applying these constraints to the findings of previous studies. The same case study from a previous paper reported that the optimal amount of photovoltaic systems installed is approximately the upper limit (set at 600 m2 in this calculation) and the optimal solution. In contrast, the optimization results with additional constraints to keep frequency fluctuations within specified limits yielded an optimal value of much less than the previous optimization; one case study showed that the optimal installation amount of photovoltaics was 0 m2. On the other hand, the key equipment in this study was the emergency diesel generator. The emergency generator compensates for power shortages and balances supply and demand under the power outage. The result suggests that case studies with demand-satisfying conditions tend to select equipment configurations that effectively improve the expected power-shortage rate.

    DOI

  • Oscillating Frequencies Generated by Combustion Oscillation in a Combustor Tube Fueled by Natural Gas and a Hydrogen Mixture

    Akane Uemichi, Kan Mitani, Yudai Yamasaki, Shigehiko Kaneko

    Journal of Pressure Vessel Technology   144 ( 4 )  2022.08  [Refereed]

     View Summary

    <jats:title>Abstract</jats:title>
    <jats:p>From previous combustion oscillation experiments using a simulated gas turbine combustor, oscillation frequencies around 350 Hz were measured in only natural gas-fired, and around 200 and 400 Hz were measured in the case of hydrogen-containing fuel. In this study, the axial gas column vibration mode was assumed, and the method to reproduce the change of oscillating frequency due to the difference of fuel was investigated. In the previous study, the temperature distribution in the combustor was divided into only two regions, and there were problems in terms of parameter estimation for modeling the flame dynamics. Therefore, the transfer matric method that incorporates a linear temperature gradient was employed. Also, the temperature distributions obtained from computational fluid dynamics, and experiments were reduced to one dimension to reproduce the difference in combustion characteristics due to the difference in fuel composition; four methods were proposed, the axial representative temperatures. The Nyquist plot method was used to calculate up to 10 combinations of resonant frequency and growth rate simultaneously. Furthermore, the oscillation frequency was determined in which the resonance frequency with the growth rate was maximum. As a result, the value of the oscillating frequency obtained differed depending on creating the representative temperature distribution.</jats:p>

    DOI

  • A power balance simulator to examine business continuity in hospital facilities due to power outages in a disaster

    Akane Uemichi, Ryo Oikawa, Yudai Yamasaki, Shigehiko Kaneko

    Journal of Energy Resources Technology     1 - 21  2021.12  [Refereed]

    Authorship:Lead author

     View Summary

    <title>Abstract</title>
    In hospitals, the energy supply is the key to ensuring modern medical care even during power outages due to a disaster. This study qualitatively examined whether the supply-demand balance can be stabilized by the private generator prepared by the hospital building during stand-alone operations under disaster conditions. In the nanogrid of the hospital building, the power quality was examined based on the AC frequency, which characterizes the supply-demand balance. Gas engine generators, emergency diesel generators, photovoltaic panels, and storage batteries were presumed to be the private generators in the hospital building. The output reference values for the emergency diesel and gas engine generators were set using droop control, and the C/D controller enabled synchronized operation. In addition, to keep the AC frequency fluctuation minor, the photovoltaic panels were designed to suppress the output fluctuation using storage batteries. As a result of case studies, the simulator predicts that the frequency fluctuation varies greatly depending on the weather conditions and the fluctuation suppression parameters, even for the same configuration with the same power generation capacity. Therefore, it is preferable to increase the moving average time of the output and reduce the feedback gain of the storage battery to suppress the output fluctuation from the photovoltaics. However, there is a tradeoff between suppressing the output fluctuation and the minimum required storage capacity. Furthermore, since the photovoltaics' output varies with the weather, other private generators' capacity and control parameters significantly impact power quality. The simulator proposed in this study makes it possible to study each hospital's desirable private generator configuration.

    DOI

  • Development of the mathematical model for the prediction of friction loss in turbocharger bearing components

    坂上聡, 上道茜, 山崎由大, 金子成彦, 窪山達也, 森吉泰生

    日本機械学会論文集(Web)   84 ( 865 ) 18 - 00127-18-00127  2018

     View Summary

    <p>It is required to examine the characteristics of turbochargers for automobiles using one-dimensional simulation from the viewpoint of estimating total engine performance. In this study, a mathematical model to predict mechanical loss generated in a turbocharger is proposed. Friction works generated in a journal bearing and a thrust bearing are modeled, separately. As for the calculation of the friction work with the thrust bearing, the thrust force is calculated from the fluid force which is formulated analytically and calculated numerically based on one-dimensional flow taking account of relevant boundary conditions. According to the developed model, the friction work generated in a journal bearing is larger than that in a thrust bearing. Difference of thrust force and flow rate of oil has less impact on the friction works in a turbocharger. Finally, calculated total friction work based on the model proposed in the present study is compared with that obtained from the oil temperature method.</p>

    DOI CiNii J-GLOBAL

  • Development of Multi-Objective Optimization Tool to Determine Amount of Distributed Power Generation Equipment Considering Economy, Environment, and Resiliency

    Uemichi Akane, Yagi Masaaki, Yamasaki Yudai, Kaneko Shigehiko

    Journal of Japan Society of Energy and Resources   39 ( 6 ) 6 - 18  2018

     View Summary

    To strengthen energy resiliency, a multi-objective optimization tool was developed, which can calculate optimum amounts to install distributed power generators as private power generation equipment which is available not only during an emergency situation but also during a normal situation. As distributed power generation equipment, cogeneration systems, photovoltaic system, and storage batteries were considered. The tool was developed based on our previous study and two objective functions were applied; one is the expected value of electric power shortage ratio after disasters as an index of the energy-resilience and the other is the total cost as an indicator of economic and environment. Then, case studies were performed considering several sizes and gas-supply pressure type of hospitals. As a result, reasonable Pareto-optimal solutions were obtained. For comparison, a case of an equivalent hospital only installed emergency generators were calculated, and the solution was plotted on the same plane of the objective functions. Therefore, the expected value of the power shortage rate after disasters was 32%. On the other hand, in all the case of the obtained optimal solutions, the expected value could be reduced to less than 20%. In addition, the total cost could also be reduced.

    DOI CiNii J-GLOBAL

  • Evaluation of residential power supply by photovoltaics and electric vehicles

    Takuya Higashitani, Takashi Ikegami, Akane Uemichi, Atsushi Akisawa

    Renewable Energy   178   745 - 756  2021.11

     View Summary

    Electric vehicles (EVs) and vehicle-to-home (V2H) technologies are expected to be used as domestic electricity storage systems, thereby promoting the self-consumption of photovoltaic (PV) power. The purpose of this study was to evaluate the profitability of V2H installation, the optimal facility configuration and the energy performance of V2H, while considering a diversity of household types and storage facility options. We optimized the facilities and operation strategy of a residential energy system under many scenarios with different electricity demand profiles, automobile usage patterns and available areas for PV installation. The results showed that a V2H system should generally be installed instead of a stationary battery (SB), but combining a V2H system with a SB is more economical for households with long EV absence times. Additionally, V2H is profitable for households with short EV absence times, large available areas for PV installation and high electricity demand. Furthermore, V2H exhibits superior energy independence and energy-saving effects for households whose annual PV generation exceeds the yearly household electricity demand.

    DOI

  • Multiple-input multiple-output control of diesel combustion using a control-oriented model

    Yudai Yamasaki, Ryosuke Ikemura, Motoki Takahashi, Shigehiko Kaneko, Akane Uemichi

    International Journal of Engine Research   20 ( 10 ) 1005 - 1016  2019.12  [Refereed]

     View Summary

    In this study, a multiple-input multiple-output feedforward controller for use with multiple-point fuel injection systems is applied to a diesel engine using an original control-oriented model. The target-tracking performance of this multiple-input multiple-output feedforward controller was then tested in terms of how well the controller adjusts the fuel delivery ratios to the pilot injection, pre-injection, main fuel injection, and the main fuel injection timing, and controls the in-cylinder peak pressure and its timing. Control experiments are conducted at different engine outputs and speeds while changing the targets of the in-cylinder peak pressure and its timing. The controller is able to track the varying targets within an acceptable error included in the original model. The calculation time, which is almost double that of a single-input single-output controller, is sufficiently fast to derive the applicable inputs.

    DOI

  • Combustion oscillation characteristics of hydrogen-rich fuel

    Akane Uemichi, Ippei Kanetsuki, Shigehiko Kaneko

    Lecture Notes in Mechanical Engineering     371 - 376  2019  [Refereed]

     View Summary

    In this study, combustion oscillation characteristics of hydrogen-rich fuel were investigated. The experimental results fueled by mixture of natural gas and hydrogen show that hydrogen-rich combustion influences on the oscillating fre-quencies. In the case of only natural gas, the single oscillating frequency around 350 Hz is obtained, and in the hydrogen-containing fuel case, the double oscillating frequencies around 200 and 400 Hz are measured. However, the latter oscillating frequencies could not be derived from the one-dimensional acoustic analysis. Therefore, to figure out these frequencies, the acoustic impedance was measured experimentally and the oscillating frequencies were re-calculated using the measured acoustic impedance as the acoustic boundary conditions. As a result, the 200, 350, and 400 Hz frequencies could be expressed using the acoustic impedances.

    DOI

  • Multi-objective optimization to determine installation capacity of distributed power generation equipment considering energy-resilience against disasters

    Akane Uemichi, Masaaki Yagi, Ryo Oikawa, Yudai Yamasaki, Shigehiko Kaneko

    Energy Procedia   158 ( - ) 6538 - 6543  2019  [Refereed]

     View Summary

    In 2017, the Mistry of Health, Labor, and Welfare in Japan added a requirement for domestic disaster base hospitals to install electric power generation equipment with a generation capacity at least 60% of usual demand for securing business continuity. In this study, we developed a multi-objective optimization tool for assisting the determination of the capacity of distributed generation equipment and contract plans considering energy-resiliency after a disaster. The selected objective functions are a total cost representing economy and environment, and an expected value of power shortage ratio after the catastrophe representing energy-resiliency. As a result, our developed tool could obtain the Pareto-optimal solutions for various size hospitals on the parameter plane of the two objective functions. As well as total costs, for all optimal solutions, the expected value of power shortage ratio under disaster situation resulted in less than 40% suggesting that the national requirement standard is satisfied. Then, the cluster analysis was carried out to grasp the tendency of optimal solutions. From the analysis of average value for each cluster, it is shown that the optimal introductory capacities of gas engine generators and storage batteries couple through the outage probabilities of gas supply. Furthermore, the optimal capacity of photovoltaic is much larger than the one assumed to install on the estimated rooftop area of the hospital building, which suggests that hospital can take an option to introduce more photovoltaics to an adjacent area if possible.

    DOI

  • Formation of ultra-lean comet-like flame in swirling hydrogen–air flow

    Akane Uemichi, Kento Kouzaki, Kazunori Warabi, Kohei Shimamura, Makihito Nishioka

    Combustion and Flame   196   314 - 324  2018.10  [Refereed]

     View Summary

    In this study, a hydrogen–air premixed flame in a partially tapered swirl burner in which a stable counterflow of unburned and burned gases is expected to be formed, was investigated. The experimental results indicate the formation of almost steady flames at equivalence ratios of as lean as 0.084, and the resulting ultra-lean flames in the swirling flow had a comet shape. Furthermore, the flame was numerically reproduced, and the mechanisms behind the phenomenon were identified by checking the balance among the chemical enthalpy through diffusion, heat flux by conduction, and transport of these parameters by convection. It was determined that the region around the tip of the flame head was almost dominated only by diffusion and heat conduction similar to a flame ball, but its formation mechanism was found to be essentially different from that of a flame ball because the comet-like flame can be numerically reproduced even without a radiative heat loss, in contrast to a flame ball.

    DOI

  • System design to reduce disaster risks by installing distributed power resources

    Akane Uemichi, Masaaki Yagi, Ryo Oikawa, Yudai Yamasaki, Shigehiko Kaneko

    Multiscale and Multidisciplinary Modeling, Experiments and Design   1 ( 1 ) 49 - 56  2018.03  [Refereed]

     View Summary

    Subsidy and social systems should be designed to effectively promote, for example, the introduction of a mechanical system. For an effective subsidy distribution, developing evidence-based decision-making methodologies is essential. We developed a tool that minimizes an objective function includes economic costs, environmental cost, and disaster risk to determine the amount of energy distributed by the equipment when installing in hospitals against disasters. Open data available on the Internet are used as simulation values herein. This simulation model optimizes six design values using a genetic algorithm based on the values (business site area, demand for heat and electricity, and maximum allowable loss) input by customers for their construction and visualizes the total cost. The tool allows to quantitatively assess the changes in the initial and running costs owing to equipment installation and the avoidable losses related to CO 2 emission reductions and disaster risks. In addition, the net present value (NPV) can be calculated using the obtained values for initial and running costs, thereby allowing to clearly estimate the return on investments after equipment installation. The opportunity profit can be calculated based on the difference between the NPV after 15 years assuming no risk and with disaster risks. A method to set this opportunity profit as a calculated subsidy amount is proposed herein. Decision support can be provided via these simulations to the customers and government subsidy system design engineers.

    DOI

  • Utilization of transport of species and heat release to a DRG-method-based reduction

    Kazuhiko Yamasaki, Sho Honya, Akane Uemichi, Makihito Nishioka

    Journal of Thermal Science and Technology   13 ( 2 ) JTST0029 - JTST0029  2018

     View Summary

    We propose a new DRG-based mechanism reduction method that considers heat release rate (HRR), transport of species, and reaction rate. In the original DRG method developed by T. Lu and C. K. Law, species importance is evaluated using only the reaction rate, and PSR is used for sampling. However, combustion phenomena are also affected by the transport of species and HRR, and sampling using PSR may be inadequate to produce a skeletal mechanism that can simulate a realistic flame. Therefore, in the proposed transport and heat DRG method, a 1D premixed flame is used for sampling, and species importance is evaluated relative to reaction rate, transport flux, and HRR. The proposed method was evaluated in ethylene/air and n-butane/air 1D premixed flame, and the laminar flame speed and flame structure were obtained using skeletal mechanisms created by three DRG methods, i.e., the original, transport, and transport and heat methods. In the case of the ethylene/air premixed flame, the transport and heat DRG method produced a smaller skeletal mechanism that well-reproduced the result of the detailed mechanism. In the case of n-butane/air premixed flame, smaller skeletal mechanisms were obtained in the region of relative error on laminar flame speed of 0.1–1.0% with the transport and heat DRG method.

    DOI CiNii

  • Effects of the multi diesel injection on natural-gas dual fuel engine

    SAKO Yutaro, YAMASAKI Yudai, UEMICHI Akene, KANEKO Shigehiko

    Transactions of the JSME (in Japanese)   84 ( 859 ) 17 - 00381-17-00381  2018

     View Summary

    <p>Dual fuel engines (DFE) suffer from considerably high total hydrocarbon emissions and low thermal efficiency due to its poor combustion at low loads. Also, further improvement of thermal efficiency is needed at high loads. Therefore, in this study, the effect of double diesel fuel injection on the combustion and exhaust emission characteristics of DFE using town gas 13A (natural gas) was investigated in the experiments and injection strategy was developed. The experiments were conducted using a single-cylinder engine and with a common rail injection system, varying the number of fuel injection and injection timings. In lower loads, the combustion of natural gas was activated by the double injection and both THC emissions and thermal efficiency were improved. By advancing the second injection timing, CA50 was shifted toward the top dead center and hence the thermal efficiency was improved. On the other hand, at higher loads, although the thermal efficiency slightly improved by the double injection, NOx emissions increased. It was suggested that the injection interval of double injection was appropriately selected and the injection timing was retarded so that the NOx emission can be suppressed while keeping the thermal efficiency high.</p>

    DOI CiNii

  • Examination of oscillation frequency for combustion oscillation considering acoustic boundary conditions

    上道茜, 金築一平, 金子成彦

    日本機械学会論文集(Web)   84 ( 861 )  2018

     View Summary

    &lt;p&gt;Hydrogen combustion is attracting attentions because of zero CO&lt;sub&gt;2&lt;/sub&gt; emission. Recently, a gas turbine which uses hydrogen-rich fuel is being developed. In our previous study, we examined the influence of hydrogen-containing ratio on combustion oscillation for fuel mixtures of hydrogen and town gas (13A) experimentally. In the experiment, pressure oscillations were measured by a sensor which is installed at the bottom of the combustor. It is found that two oscillation frequencies near 200 Hz and 400 Hz were simultaneously detected in the case of hydrogen-containing fuels, whereas single oscillation frequency around 350 Hz was observed in the case of only 13A fuel. To understand this difference of oscillating frequencies, we conducted acoustic analysis using one-dimensional different diameter acoustic model. However, this simplest model could not reproduce three types of oscillating frequencies obtained by the experiment. Besides, we used an acoustic impedance of the bottom of the combustion chamber as an acoustic boundary condition. The acoustic impedance is measured experimentally under the noncombustion (cold) condition and corrected by combustion temperature obtained by equilibrium calculation. As a result of applying the corrected acoustic impedance, the three types of oscillating frequencies could be reproduced by acoustic analysis. Furthermore, to express the difference among fuel mixtures, delay times, flame positions, and the mean temperature in the chamber were calculated by the CFD simulation. Consequently, it is found that the acoustic analysis result could reproduced the difference among fuel mixtures; hydrogen makes the oscillating frequencies a little higher, because temperature becomes higher and delay time becomes shorter.&lt;/p&gt;

    CiNii J-GLOBAL

  • Evaluation of damping effect of perforated plate on the first resonant wave height of liquid sloshing under pitching excitation utilized by CFD

    新木悠斗, 上道茜, 山崎由大, 金子成彦

    日本機械学会論文集(Web)   84 ( 861 )  2018

     View Summary

    &lt;p&gt;As a method for mining offshore gas fields, a floating production, storage and offloading (FPSO) system is attracting attention. However, sloshing in the oil-gas separator installed in FPSOs excited by sea waves is expected to cause significant difficulties. To suppress sloshing wave heights, one possibility may be to install perforated plates in a tank. In this study, a method is proposed for the accurate estimation of the first resonant wave height in the horizontal cylindrical tank with a perforated plate under pitching excitation in less time. To accomplish this purpose, the pressure loss due to the perforated plate in the open channel must be estimated accurately. Therefore, the pressure loss is modeled using steady CFD calculations considering the effects of the distribution of the flow velocity and the distribution of the inflow angle. The first order sloshing wave height is calculated in the theoretical analysis by substituting the pressure loss calculated in steady CFD. The wave heights determined using the pressure loss utilized by steady CFD are compared with the experimental value measured with a small-scale model. Using the method proposed in this study, the first resonant wave height of sloshing wave height is calculated accurately in less time.&lt;/p&gt;

    CiNii J-GLOBAL

  • Sloshing in a Horizontal Cylindrical Tank Subjected to Pitching Excitation and Damping Effects by Perforated Plates

    Hidemitsu Sakai, Akane Uemichi, Akihiro Takai, Yudai Yamasaki, Shigehiko Kaneko

    Journal of Pressure Vessel Technology, Transactions of the ASME   139 ( 4 )  2017.08  [Refereed]

     View Summary

    Natural gas is relatively clean, and its demand is currently increasing. In most cases, gas fields are located at the bottom of the sea. Therefore, floating production, storage, and offloading (FPSO) systems are now attracting considerable attention. This paper is related to the dynamical design of a FPSO system; in particular, it focuses on the free surface elevation induced by the waves in a horizontal cylindrical and axisymmetric liquid vessel with end caps. In this study, the theory of the wave height and resonant frequency in a horizontal cylinder subjected to pitching via external excitation is developed. Then, a theory taking into account the effect of perforated plates is introduced. A special discussion is made with regard to the number and location of the perforated plates and the effect of a partial opening in a perforated plate on the damping. Finally, the experimental data of resonant wave heights up to the third mode are shown in comparison to the theoretically derived results.

    DOI

  • Proposal of an Optimization Method for Installing Co-Generation Equipment Considering Business Continuity Planning Under Disaster Cases

    Nagao Hiroshi, Uemichi Akane, Yagi Masaaki, Yamasaki Yudai, Kaneko Shigehiko, Bando Shigeru

    Journal of Japan Society of Energy and Resources   38 ( 4 ) 10 - 23  2017  [Refereed]

     View Summary

    After the 2011 Great East Japan Earthquake, a business continuity planning, i.e., BCP, in a disaster case is attracting attentions in Japan. However, when a customer, i.e. a building owner actually would like to introduce energy generation devices such as a cogeneration equipment, there is no guideline to decide suitable device capacity based on the evaluation of economic efficiency and BCP as well as energy saving performance. This study proposes a method to optimize a plan for installing cogeneration equipment considering BCP under disaster risks simultaneously. We develop a simulation tool to decide an optimized planning of energy-generation equipment configuration. With this simulation tool, we performed case studies for different business cases such as a hospital and a hotel. The simulation results showed that the optimized installing plan can be an over-specification of equipment configuration under the assumption of disaster risks, which is never chosen under conventional definition. Then, we examined the economic performance of an energy generation equipment configuration by calculating a net present value from the viewpoint of BCP. This examination can give judgments of investment-return possibility and suitable subsidy price.

    DOI CiNii J-GLOBAL

  • Influence of mock reformed gas by over-rich SI combustion on HCCI combustion fuelled by methane

    MIYOSHI Masaki, YAMASAKI Yudai, UEMICHI Akane, KANEKO Shigehiko

    Transactions of the JSME (in Japanese)   83 ( 847 ) 16 - 00391-16-00391  2017

     View Summary

    <p>HCCI combustion is effective for improving thermal efficiency of a gas engine, but it has problems such as control of the ignition and combustion. To solve the problem, availabilities of dedicated EGR technique are considered to control its ignition and combustion. Dedicated EGR involves reforming fuel into H2 or CO by running a single or more cylinder with rich mixture and supplying the exhaust gas directly into other cylinders. In this study, the effect of dedicated EGR on methane HCCI combustion was investigated by experiments. As a result, when equivalence ratio of rich SI combustion or EGR ratios increase, the ignition timing of HCCI advances and combustion becomes steep. The advanced ignition timing is caused by an increase of H2 mole fraction in the intake gas. In addition, the possibility of controlling the ignition timing, which is strongly concerned with the thermal efficiency of a HCCI engine, by dedicated EGR was discussed. It was shown that the ignition timing linearly depends on H2 mole fraction in the intake gas.</p>

    DOI CiNii J-GLOBAL

  • 災害時の事業継続性を考慮したコージェネレーション機器導入計画最適化手法の提案

    長尾浩志, 上道茜, 八木正彰, 山崎由大, 金子成彦, 坂東茂

    エネルギー・資源   38 ( 4 ) 224  2017

    J-GLOBAL

  • Proposal of a decision scheme for installing a cogeneration system considering disaster risks

    Hiroshi Nagao, Akane Uemichi, Yudai Yamasaki, Shigehiko Kaneko

    Applied Thermal Engineering   114   1414 - 1423  2017  [Refereed]

     View Summary

    This paper proposes a scheme, called the disaster-risk-weighted damage inequality, for a customer to perform introductory planning for a distributed generation system considering business continuity planning in a disaster case. To calculate this inequality, the relevant disaster risks are surveyed and system operating simulations for target buildings such as a hotel, a hospital, a large-scale office, and a collective housing building are performed by solving a mixed integer linear programming problem under the assumption that a cogeneration system is installed as a distributed generation system. Next, we determined the probabilities of a disaster occurrence and business interruption due to a disaster, the initial cost of the equipment, the running cost, and the reduction in running cost due to a cogeneration system installation. The cogeneration system was found to effectively reduce the running cost. Finally, the suggested inequality is calculated and determined whether it is satisfied. The result showed that cogeneration system installation very effectively reduces the running cost for a hotel, a hospital, and a large-scale office, compared to the tolerable amount of loss that is preliminarily determined by a customer.

    DOI

  • Effect of Elevated-Pressure and Radiative Heat Loss on Rotating Counterflow Twin Flame

    日本燃焼学会誌 = Journal of the Combustion Society of Japan   57 ( 179 ) 60 - 70  2015.02  [Refereed]

    DOI CiNii

  • Combustion mechanism of ultralean rotating counterflow twin premixed flame

    Akane Uemichi, Makihito Nishioka

    Combustion Theory and Modelling   19 ( 1 ) 57 - 80  2015.01  [Refereed]

     View Summary

    In our previous numerical studies [Nishioka Makihito, Zhenyu Shen, and Akane Uemichi. “Ultra-lean combustion through the backflow of burned gas in rotating counterflow twin premixed flames.” Combustion and Flame 158.11 (2011): 2188–2198. Uemichi Akane, and Makihito Nishioka. “Numerical study on ultra-lean rotating counterflow twin premixed flame of hydrogen–air.” Proceedings of the Combustion Institute 34.1 (2013): 1135–1142]. we found that methane– and hydrogen–air rotating counterflow twin flames (RCTF) can achieve ultralean combustion when backward flow of burned gas occurs due to the centrifugal force created by rotation. In this study, we investigated the mechanisms of ultralean combustion in these flames by the detailed numerical analyses of the convective and diffusive transport of the main species. We found that, under ultralean conditions, the diffusive transport of fuel exceeds its backward convective transport in the flame zone, which is located on the burned-gas side of the stagnation point. In contrast, the relative magnitudes of diffusive and convective transport for oxygen are reversed compared to those for the fuel. The resulting flows for fuel and oxygen lead to what we call a ‘net flux imbalance’. This net flux imbalance increases the flame temperature and concentrations of active radicals. For hydrogen–air RCTF, a very large diffusivity of hydrogen enhances the net flux imbalance, significantly increasing the flame temperature. This behaviour is intrinsic to a very lean premixed flame in which the reaction zone is located in the backflow of its own burned gas.

    DOI

  • Effect of Elavated-Pressure and Radiative Heat Loss on Rotating Counterflow Twin Flame

    上道茜, 大崎靖雄, 西岡牧人

    日本燃焼学会誌   57 ( 179 ) 60 - 70  2015

     View Summary

    &lt;p&gt;The effects of elevated-pressure on rotating counterflow twin flame were numerically investigated. The range of pressure is from 1 to 8 atm. We performed numerical simulations with and without radiative heat loss. The loss was evaluated by using an optically thin model, which does not consider reabsorption of radiative energy. Without radiation, the leanest extinction limits reached ultralean conditions; the higher the pressure is, the leaner the extinction limits are. On the other hand, with radiative heat loss, the leanest extinction limits are shifted to richer condition as the pressure becomes higher; above 2 atm, the leanest extinction limits cannot reach ultralean condition. The response curves of the flame temperature to the equivalence ratio are distorted when radiative heat loss is considered. Under high pressure, the flame thickness is thinner and the heat release rate is enhanced mainly because of the increase of gaseous density in the both cases of with and without radiation heat loss. However, the temperature behind the flame zone much decreases due to the radiative heat loss in the high pressure case. This is because of increments of partial pressures of the radiative species and the length of the residence time of fluid in the backflow region of burned gas.&lt;/p&gt;

    DOI CiNii J-GLOBAL

  • Numerical study on ultra-lean rotating counterflow twin premixed flame of hydrogen-air

    Akane Uemichi, Makihito Nishioka

    Proceedings of the Combustion Institute   34 ( 1 ) 1135 - 1142  2013  [Refereed]

     View Summary

    Rotating counterflow twin premixed flame (RCTF) of hydrogen air was numerically simulated with detailed chemistry to explore the possibility of ultra-lean combustion. As a result, it was found that ultra-lean RCTF of equivalence ratio U = 0.052, which is far leaner than the generally-recognized flammability limit U = 0.10, is realized. It was also found that under ultra-lean conditions the flame temperature of RCTF largely exceeds the adiabatic flame temperature; e.g., at O = 0.06 the former is 1171 K, while the latter is 503 K. This increase of burned gas temperature is attributed to the so-called low Lewis number effect within the flammability limit, but under an ultra-lean condition some other mechanism to increase temperature is dominant. The 'pseudo local equivalence ratio' of burned gas of RCTF differs largely from that of the unburned gas due to the extraordinarily high concentration of H 2O. This suggests the possibility that the local condition at the reaction zone is much richer than the unburned gas, which brings about the large temperature increase. © 2012 The Combustion Institute.

    DOI

  • Ultra-lean combustion through the backflow of burned gas in rotating counterflow twin premixed flames

    Makihito Nishioka, Zhenyu Shen, Akane Uemichi

    Combustion and Flame   158 ( 11 ) 2188 - 2198  2011.11  [Refereed]

     View Summary

    Rotating counterflow twin premixed flames of methane-air were numerically simulated with detailed chemistry based on a similarity solution to explore the leanest extinction limit without preheating and to elucidate the mechanism of " ultra-lean" combustion. We focused on high rotation rate cases in which unrealistic backflow from infinity is allowed to occur since ultra-lean combustion was found to be realized in such a situation. It was found that the reaction zone is in the backflow zone, where the flame's apparent burning velocity is negative, and that the flame zone width is much smaller than that of a 1-D planar premixed flame due to an inversion of the convexity directions of the profiles of temperature and main species concentrations. The decrease of the flame width seems to make the flame less extinguishable. The equivalence ratio of the leanest flame obtained neglecting radiative heat loss is 0.32, while that obtained with an optically thin radiation model is 0.42, which is still much leaner than the ratio of 0.49 for a 1-D planar premixed flame generated using the same radiation model. © 2011 The Combustion Institute.

    DOI

  • Propagation characteristics of shock waves driven by gaseous detonation waves

    S. Kato, S. Hashimoto, A. Uemichi, J. Kasahara, A. Matsuo

    Shock Waves   20 ( 6 ) 479 - 489  2010.12  [Refereed]

     View Summary

    We experimentally investigated propagation characteristics of the shock wave driven by a gaseous detonation wave emerging from the open end of a cylindrical detonation tube. In the present study, we visualized the shock wave and exhaust flowfields using a shadowgraph optical system and we obtained peak overpressure in the tube axial direction and the continuous shape transformation of shock waves around the tube open end. We also obtained overpressure histories of the shock wave using piezo-pressure transducers within 201 m from the open end of the tube. We normalized and classified these results by four regions using non-dimensional pressure and distance which are independent of variety of mixture and tube diameter. In the vicinity of the open end of the tube, the shock wave is nearly planar and does not significantly attenuate, and the peak overpressure maintains approximately C-J pressure. Subsequently, the shock wave attenuates rapidly, transforming from quasi-spherical to spherical. Farther from the tube open end, the shock wave propagates with approximately sound characteristic so that the peak overpressure decreases proportional to 1/r. Eventually, the shock wave begins to attenuate more rapidly than ideal sound attenuation, which may be due to the viscous effect. © 2010 Springer-Verlag.

    DOI

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Books and Other Publications

  • Fluid Induced Vibrations: Classification and Lessons from Practical Experiences [3rd Edition]

    JSME( Part: Contributor)

    2018.11

Misc

  • 燃焼特性にこだわって振動解析をしてみる(研究ストーリー)

    上道 茜

    日本機械学会誌   123 ( 1214 ) 53 - 53  2020

    DOI CiNii

  • 災害拠点病院を対象とした災害時事業継続性向上のための分散型電源導入量の最適化

    上道茜, 山崎由大, 金子成彦

    オペレーションズ・リサーチ   65 ( 1 ) 41 - 48  2020  [Invited]

    Article, review, commentary, editorial, etc. (scientific journal)  

    CiNii J-GLOBAL

  • マイクロガスタービンの技術動向と開発事例 : 低カロリーガス対応マイクロガスタービンの開発 (特集 高効率ガスタービンの現状と将来)

    金子 成彦, 上道 茜

    電気評論   104 ( 4 ) 37 - 42  2019.04  [Invited]

    Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)  

    CiNii

  • Guideline for Manuscripts "Presen Hiroba" at the University of Tsukuba : Regular Inter-discipline Communications at a University

    科学技術コミュニケーション   ( 16 ) 77 - 89  2014.12  [Refereed]

    CiNii

  • "Presentation Competition of Graduate Students" at the University of Tsukuba : Science Communications at a University Festival

    Hisashi Ishida, Keiichi Zempo, Akane Uemichi

    科学技術コミュニケーション   ( 11 ) 63 - 73  2012.06  [Refereed]

    CiNii

  • The Launch Test of the Hybrid Rocket and Its Range Safety

    HABU Hiroto, WADA Eiichi, NIWA Takahiro, KONDO Yasuo, KAWAMURA Takafumi, MARUYAMA Shinya, OKAMURA Ayano, YAMASHINA Saera, NAGAI Yasuhito, NAKAMICHI Tatsuya, UEMICHI Akane, TANAKA Naruaki, KOBAYASHI Naoki, KASAHARA Jiro, MORITA Yasuhiro

    AEROSPACE TECHNOLOGY JAPAN, THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES   9   15 - 21  2010

     View Summary

    The educational hybrid-rocket was successfully launched and it also landed within the predicted area. Aerodynamic characteristics of the rocket designed by students of Tsukuba University were evaluated by the wind tunnel testing with the support of Tokai University. The flight path affected by the environmental condition, especially wind direction and velocity, was simulated with the original calculation program. The altitude of the rocket was measured with the optical equipment and the apex was 123 m although the calculation indicated 198 m. We expected that the insufficient filling or the...

    DOI CiNii J-GLOBAL

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Awards

  • R&D Encouragement Award

    2020.11   NF Foundation  

  • Outstanding Paper Award

    2019.03   Japan Society of Energy and Resources   Development of Multi-Objective Optimization Tool to Determine Amount of Distributed Power Generation Equipment Considering Economy, Environment, and Resiliency

    Winner: Akane Uemichi, Masaaki Yagi, Yudai Yamasaki, Shigehiko Kaneko

  • JSME Medal for Outstanding Paper

    2019.03   The Japan Society of Mechanical Engineers   Examination of oscillation frequency for combustion oscillation considering acoustic boundary conditions, Transaction of the JSME (in Japanese) Vol. 84, No. 861, 2018.

    Winner: Akane Uemichi, Ippei Kanetsuki, Shigehiko Kaneko

  • Best presentation award

    2018.09   Engine system devision of the JSME  

    Winner: Akane Uemichi

  • Best Presentation Prize

    2015.11   Combustion Society of Japan   Poster session on the Fifty-Third Symposium (Japanese) on Combustion

    Winner: Akane Uemichi, Yudai Yamasaki, Shigehiko Kaneko

  • 優秀修士論文発表者賞

    2011.03   筑波大学システム情報工学研究科構造エネルギー工学専攻  

    Winner: 上道茜

  • Miura award

    2011.03   The Japan Society of Mechanical Engineers  

    Winner: Akane UEMICHI

  • 第三学群長賞

    2009.03   筑波大学第三学群  

    Winner: 上道茜

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Research Projects

  • Investigation of combustion oscillation’s oscillating frequencies and dominant mode generated in a gas turbine combustor fueled by hydrogen-containing fuel mixture

    JSPS  KAKENHI

    Project Year :

    2022.04
    -
    2025.03
     

  • Development of a driver's physical condition prediction model that can consider dynamic changes in the thermal environment inside the vehicle

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

    Project Year :

    2021.04
    -
    2024.03
     

  • Development of a mathematical model to predict friction loss in turbocharger bearing

    Transmission Research Association for Mobility Innovation 

    Project Year :

    2021.04
    -
    2023.03
     

  • Proposal of a Practical Method to Secure Energy for Hospital under Emergency using Digital Twin

    Kajima Foundation  2022FY Research Grant

    Project Year :

    2022.04
    -
     
     

  • Modeling of combustion oscillation using acoustic impedance of as acoustic boundary conditions

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Early-Career Scientists

    Project Year :

    2019.04
    -
    2022.03
     

  • System design to introduce energy-saving equipment for reinforcement of resilience

    Japan Science and Technology Agency, Research Institute of Science and Technology for Sciety  Science of Science, Technology and Innovation Policy

    Project Year :

    2017.10
    -
    2022.03
     

    Akane Uemichi

  • Development of a Method to Determin Representative-Temperature Distribution to Express Combustion Characteristics for Combustion Oscillation Modeling

    Paloma Environment Technology Development Fundation 

    Project Year :

    2020.04
    -
    2021.03
     

  • Model Experiment Using Rijke Tube to Examine Combustion Oscillation Generated in Gas Turbine Combustor

    JKA 

    Project Year :

    2020.04
    -
    2021.03
     

    Akane Uemichi

  • Examination of Oscillating Frequencies Generated in Gas Turbine Combustor Fueled by Hydrogen-Rich Mixture

    Ono Charitable Trust for Acoustics

    Project Year :

    2020.04
    -
    2021.03
     

    Akane Uemichi

  • エンジンシステム制御のためのターボチャージャーモデルの構築〜摩擦損失予測のための軸受モデリング〜

    NSKメカトロニクス技術高度化財団  NSKメカトロニクス技術高度化財団研究助成

    Project Year :

    2019.03
    -
    2021.02
     

    上道茜

  • Development of a Novel Scheme for Introducing Distributed Generation System Based on Business Continuity Planning Considering Disaster Risks

    Siebel Energy Institute  Seed Grant

    Project Year :

    2017.04
    -
    2018.03
     

    Shigehiko Kaneko

  • Development of a Viewer for Combustion Process in Reciprocating Engine

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

    Project Year :

    2015.04
    -
    2018.03
     

    Uemichi Akane

     View Summary

    In this study, we focused on a microflow reactor (MFR) as a method to capture the ignition phenomenon occurring in a reciprocating engine and examined a method to easily estimate the ignition delay time. Specifically, we proposed an estimation method that combines ignition position information and ignition delay time using "Livengood - Wu integral." We conducted experiments using a mixed fuel of normal heptane and iso-octane, which is a standard fuel for evaluating knocking in engine. As a result of these experiments, it is possible to obtain an ignition photograph even with very lean premixture in MFR, that is difficult to obtain in other numerical calculations and experiments. This leads that it is possible to estimate the ignition delay time under the super lean burn condition.

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Presentations

  • 水素混焼ガスタービンで発生する燃焼振動の発振周波数の計算

    今井亮汰, 金子成彦, 上道茜

    日本機械学会関東支部第28期総会・講演会 

    Presentation date: 2022.03

    Event date:
    2022.03
     
     
  • 水素混焼ガスタービン燃焼器で発生する燃焼振動の研究

    上道茜  [Invited]

    日本機械学会関西支部第22回秋季技術交流フォーラム 

    Presentation date: 2021.09

    Event date:
    2021.09
     
     
  • 水素混焼焚きガスタービン燃焼器で発生する燃焼振動の共鳴周波数の検討

    上道茜, 呂逸凡, 草鹿仁, 金子成彦

    日本機械学会2021年度年次大会 

    Presentation date: 2021.09

  • Examination of resonant frequencies generated by combustion oscillation in a combustor fueled by a hydrogen–natural gas mixture and an upstream pipe

    Akane Uemichi, Yifan Lyu, Jin Kusaka, Shigehiko Kaneko

    ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE) 

    Presentation date: 2021

    Event date:
    2021
     
     

     View Summary

    A combustion oscillation experiment showed combustion oscillation frequencies of around 350 Hz when only natural gas was used as fuel and approximately 200 and 400 Hz when a hydrogen–natural gas mixture was used. To analyze the resonant frequency, two- and four-region models considering unburned and burned regions of the combustor were developed. The experimental frequencies of the 100% natural gas condition were successfully predicted. Conversely, the experimentally observed frequencies under the hydrogen–natural gas condition were not accurately predicted. A swirler-combustor model was then constructed to get closer to the actual configuration and shape of the experimental setup. However, the model could not reproduce the experimental value under the hydrogen–natural gas condition. A whole piping model was then developed by adding a casing and an air supply pipe to the combustor. The resonant frequencies under both the 100% natural gas and hydrogen–natural gas conditions were successfully calculated. The model reproduced the range and change tendency of the experimentally measured oscillation frequency.

  • Optimization of the capacities of private generators installed in a hospital building under the constraint of demand sufficiency during power outages

    Akane Uemichi, Naoki Kaito, Yudai Yamasaki, Shigehiko Kaneko

    American Society of Mechanical Engineers, Power Division (Publication) POWER 

    Presentation date: 2021

    Event date:
    2021
     
     

     View Summary

    It is essential to secure energy sources by installing a private power generator for business continuity in a power outage. The authors have developed an optimization tool to estimate the optimal amount of distributed power supply equipment using economic efficiency and resilience as two evaluation indicators. However, it is questionable whether the private generator in a hospital building can generate sufficient electricity to meet demands in case of a power failure, because demand has short cycle fluctuations on the order of seconds, and the private generator must respond to these fluctuations from time to time in the case of stand-Alone operation. The optimization tools we have developed in the past have not considered the balance between power output and load demand (demand sufficiency). Therefore, this paper proposes a new optimization method that considers balancing power supply and demand in private generators' independent operation during power outages. We narrowed the optimization constraints as demand sufficiency conditions: standard AC frequency range between 49 and 51 Hz. More practical optimal solutions are obtained by applying the new constraints to the multi-optimization. We also compare the case study results by applying these constraints to the results of previous case studies.

  • CFD analysis for the enhancement of adsorbing moisture by oscillating flow

    Atsushi Akisawa, Syu Sato, Akane Uemichi

    Refrigeration Science and Technology 

    Presentation date: 2020

    Event date:
    2020
     
     

     View Summary

    This study focuses on the fact that adsorbing moisture from the air is enhanced with oscillating flow induced by acoustic wave, which mechanism has not been clear yet. The objective is to investigate the mass transfer to adsorbent with oscillating flow by CFD. A pack of granular silica gel was modeled in CFD scheme. The air flow is assumed to be the sum of background uniform flow and oscillation flow. The CFD analysis predicted the behavior of adsorption over time with various velocity amplitude. With uniform flow, only the front particles of upstream side adsorb moisture. In contrast, the particles facing to the downstream side also adsorb moisture when oscillating flow exists. The results indicate that the oscillating flow going back and forth induces the enhancement to provide moisture from the downstream side to adsorbent particles.

  • Examination of oscillating frequencies generated by combustion oscillation considering temperature distribution in a combustor tube fueled by natural gas and hydrogen mixture

    Akane Uemichi, Kan Mitani, Yudai Yamasaki, Shigehiko Kaneko

    American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP 

    Presentation date: 2020

    Event date:
    2020
     
     

     View Summary

    A combustion oscillation experiment fueling a mixture of hydrogen and natural gas was performed. The results showed oscillating frequencies of around 350 Hz in the case of the town gas only, whereas oscillating frequencies of around 200 and 400 Hz were observed in the hydrogen-containing fuel case. We hypothesized that the oscillating frequencies shift may occur by changing the temperature-distribution inside the tube, which was caused by different combustion conditions with the fuel mixture. As a result, the possible oscillating frequencies of not only around 350 Hz but also around 200 and 400 Hz were obtained. Although three types of possible oscillating frequencies were obtained in our previous study, more detailed temperature distributions should be considered to clarify the effect of the changing fuel mixture composition. In this paper, representative one-dimensional temperature distributions were formed by the combination of measured and calculated temperature distributions in the combustion tube for the corresponding fuel mixture. To include the detailed temperature distributions, the acoustic network model was divided into enough small elements to express the temperature distributions, where each element was connected by the transfer matrix. Then, the possible oscillating frequencies were calculated, taking account of the influence of the temperature distributions.

  • Two-step design process of solar cooling systems combining optimization and operational simulations

    MOCHIZUKI Yui, UEMICHI Akane, AKISAWA Atsushi

    The Proceedings of Conference of Kanto Branch  The Japan Society of Mechanical Engineers

    Presentation date: 2020

    Event date:
    2020
     
     

     View Summary

    <p>To reduce carbon dioxide emissions, ZEB (Net Zero Energy Building), which aims to promote energy saving in buildings, has attracted attention. Particularly, solar cooling systems that use solar radiation as renewable energy for ZEB are an effective heat source. However solar cooling systems have not become widespread. Therefore, it is necessary to clarify the methodology to design and operate equipments in ZEB with solar cooling systems. In this study, a two-step design process of equipments including solar cooling system was proposed. First, optimizations of configuration of the equipments including an adsorption chiller using solar heat as a heat source is performed using a mathematical model. Then, TRNSYS simulations are performed using the optimization results to derive the operation of the equipments against air conditioning load. Applying the proposed method to a hospital of 5,000 m2 , the optimal configuration of the equipments was obtained minimizing the annual cost. Then, the results of the equipment operation analysis showed that the primary energy consumption could reduce by 43% for the building with a solar cooling system than that without a solar cooling system.</p>

  • A prediction model of mechanical loss in a turbocharger considering oil temperature distribution of bearing

    YAMAGISHI Rena, YAMASAKI Yudai, UEMICHI Akane

    The Proceedings of Mechanical Engineering Congress, Japan  The Japan Society of Mechanical Engineers

    Presentation date: 2020

    Event date:
    2020
     
     

     View Summary

    <p>Recently, the downsizing turbo is widespreading to satisfy the emission regulations of automobiles. It is necessary to develop the model to predict the mechanical loss in a turbocharger in the model-based development. In our previous research, a mathematical model with the mechanical loss caused by the bearings used in a turbocharger was developed. In the previous model, the friction loss is estimated by lubricant temperature, lubricant flow, thrust force and rotation of the turbocharger. The lubricant temperature applied in the previous model was the average temperature of the inlet and the outlet. However, the inner lubricant temperature is higher than the outer lubricant temperature in the journal bearing, then it is inappropriate to apply the average temperature. This research aimed to improve the accuracy of the previous model adding the prediction model of the lubricant temperature distribution in the journal bearing. We estimated the lubricant temperature distribution in the journal bearing by calculating the Reynolds equation and energy equation iteratively. The result revealed that the lubricant temperature distribution in the axis direction, and the predicted value came closer to the measured value than the previous model in case the supply lubricant temperature is low.</p>

  • Effects of changes in temperature distribution in a tube simulating a combustor on the acoustic impedance

    HIWATARI Jun, UEMICHI Akane, AKISAWA Atsushi

    The Proceedings of Conference of Kanto Branch  The Japan Society of Mechanical Engineers

    Presentation date: 2020

    Event date:
    2020
     
     

     View Summary

    <p>The previous studies to examine the influence of the fuel composition on combustion oscillation suggested that changes in combustion characteristics due to changes in fuel compositions, that is, hydrogen-containing ratio with city gas, influenced the acoustic boundary conditions on the upstream end of the combustor. To examine this suggestion, an experimental apparatus of a Rijke tube was manufactured, which is simulating a combustor of a gas turbine. Using this Rijke tube, the acoustic impedance was calculated by the two sensor method using experimentally-measured sound pressures. The result confirmed that the peak of absolute value of the acoustic impedance as the acoustic boundary condition shifted to higher frequency region due to high temperature distributions in the tube. However, in the previous study, the assumed temperature distributions were too simple. Therefore, in this study, we focused on the influence of a realistic temperature distribution along center-axis in the tube. To measure the temperature distribution in the tube, a new Rijke tube with 13 thermocouples were manufactured and the axis temperature distributions were obtained by the linearlyinterpolated measured temperatures. As a result, the calculated acoustic impedance almost corresponded to the previous method but the additional peak of the absolute value was found.</p>

  • Study on Estimating Heat Exchanger Parameters and Internal State of an Adsorption Chiller

    NAGASAKI Yoshiyuki, UEMICHI Akane, AKISAWA Atsushi

    The Proceedings of Conference of Kanto Branch  The Japan Society of Mechanical Engineers

    Presentation date: 2020

    Event date:
    2020
     
     

     View Summary

    <p>It is necessary to know the parameters of the heat exchangers such as condenser, evaporator and adsorbent beds implemented in an adsorption chiller in order to evaluate its performance by numerical simulations. The parameters are UA-value and thermal capacity. However, these values are not available generally for actual appliances. The objective of this study is to estimate the parameters based on the numerical simulations. The outlet temperature of the plant is compared with the simulated one, which defference is fed back to adjust the estimated parameter with iterations. The study investigated the performance of the estimation procedure and found that the estimated parameters converged to the true values. The results show that the 4 parameters of condenser and evaporator can be estimated simultaneously.</p>

  • Evaluation of residential power supply by photovoltaics and electric vehicles

    Takuya Higashitani, Akane Uemichi, Takashi Ikegami, Atsushi Akisawa

    ECOS 2020 - Proceedings of the 33rd International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems 

    Presentation date: 2020

    Event date:
    2020
     
     

     View Summary

    © ECOS 2020.All right reserved. Since electric vehicles (EV) have large capacities, EVs are expected to be home battery devices if they work with Vehicle-to-Home (V2H) to store photovoltaic (PV) surplus power. To design energy systems for residential areas including EV, V2H, and PV, it is essential to know the features of houses which can expect the benefit of V2H. The objective of this paper is to analyze the potential of installing V2H at each house level considering the variation of power demand and the EV absence schedule. First, mathematical models of the energy system were formulated to optimize equipment configurations or capacities, and their operation. Then, the sensitivity analysis on the price of V2H device was conducted to estimate the competitive price of V2H. Moreover, the effects of the maximum capacity of PV were also considered in the analysis. The results showed that households with higher power demand or the larger capacity of PV had a higher potential of installing V2H. Furthermore, the EV absence time had a greater impact on the installation of V2H when the power demand was lower, or the capacity of PV was larger.

  • Estimating the regional distribution potential capacity of introducing solid oxide fuel cells

    Ryo Abe, Akane Uemichi, Takashi Ikegami, Atsushi Akisawa

    ECOS 2020 - Proceedings of the 33rd International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems 

    Presentation date: 2020

    Event date:
    2020
     
     

     View Summary

    © ECOS 2020.All right reserved. This study focuses on the use of Solid Oxide Fuel Cell (SOFC) to large commercial buildings in Japan. This is a novel combined heat and power (CHP) application. SOFC has high power generation efficiency and is expected to be adopted by buildings with relatively smaller heat loads. The effect of CHP is determined by the energy demand of the building, and the energy demand varies not only by the building application but also by region. Therefore, in this study, the adoption of SOFC is analyzed by an optimization model considering energy demand for each region in the case of hospitals, hotels, retail stores and offices as typical commercial buildings. The regional distribution of potential SOFC is also discussed by aggregating them using Geographic Information System (GIS).

  • Simulation analysis of wood dryer using solar heat

    新井文浩, 上道茜, 秋澤淳

    日本太陽エネルギー学会講演論文集(CD-ROM) 

    Presentation date: 2019

    Event date:
    2019
     
     
  • Power generation performance of solar photovoltaic module adopting triangular pyramid shape with mirrors

    河野雅弘, 上道茜, 秋澤淳

    日本太陽エネルギー学会講演論文集(CD-ROM) 

    Presentation date: 2019

    Event date:
    2019
     
     
  • CFDを用いた振動流場におけるシリカゲル粒子の吸着挙動解析

    佐藤秀, 秋澤淳, 上道茜, 上田祐樹, 藤木淳平

    日本冷凍空調学会年次大会講演論文集(CD-ROM) 

    Presentation date: 2019

    Event date:
    2019
     
     
  • Multi-objective optimization of pipe routing to suppress vibration by inner fluid flow

    Yagi Masaaki, Fujishima Shuhei, Uemichi Akane, Kaneko Shigehiko, Takahashi Shiro

    The Proceedings of OPTIS  The Japan Society of Mechanical Engineers

    Presentation date: 2018

    Event date:
    2018
     
     
  • Combination of Multiple Combustion Modes in a Gas Engine System Using Dedicated EGR

    竹内智顕, 山崎由大, 上道茜, 金子成彦

    日本機械学会動力・エネルギー技術シンポジウム講演論文集(CD-ROM)  一般社団法人 日本機械学会

    Presentation date: 2018

    Event date:
    2018
     
     

     View Summary

    &lt;p&gt;Although HCCI combustion has high thermal efficiency, it has difficulties such as controlling its ignition timing and combustion. This study proposed a method to make HCCI combustion in gas engines possible, combining dedicated EGR, SI combustion, and HCCI combustion, i.e. multiple combustion modes engine system. In a DEGR system, one cylinder runs with a premixture of rich fuel and air to reform the part of its exhaust gas into hydrogen and carbon monoxide, which are introduced to other cylinders and promote combustion. In this study, the exhaust gas was introduced through a bypass from rich SI cylinder to HCCI cylinder. In the experiments, conditions of high thermal efficiency and combustion characteristics were investigated. It was revealed that DEGR made HCCI combustion possible on a condition that HCCI combustion was impossible. The more the DEGR rate was, the higher the thermal efficiency was, and the thermal efficiency reached a maximum value when the equivalent ratio of rich SI combustion was adjusted. We proposed the adjustment of premixed gas amount in Rich SI cylinder as a means of improving thermal efficiency, and it was successful.&lt;/p&gt;

  • ターボチャージャにおける機械損失モデルの構築

    坂上聡, 上道茜, 山崎由大, 金子成彦, 窪山達也, 森吉泰生

    内燃機関シンポジウム講演論文集(CD-ROM) 

    Presentation date: 2017.12

  • Study on the Blow-off Suppression Method of Jet Diffusion Flame by Adding Small Amount of Fuel

    成田大, 上道茜, 西岡牧人

    燃焼シンポジウム講演論文集 

    Presentation date: 2017.11

  • DRG-Method-Based Reduction through the Direct Interaction Evaluated from Heat Release and Transport of Species

    山崎一彦, 上道茜, 西岡牧人

    燃焼シンポジウム講演論文集 

    Presentation date: 2017.11

  • Study on Ultralean Premixed Swirling Flames of Mixture Fuels of Light Hydrocarbons and Hydrogen

    足立和輝, 山崎浩一, 上道茜, 西岡牧人

    燃焼シンポジウム講演論文集 

    Presentation date: 2017.11

  • 災害リスクを考慮したCGS・PV・蓄電池から構成される分散型電源導入計画

    八木正彰, 上道茜, 山崎由大, 金子成彦, 坂東茂

    エネルギー・資源学会研究発表会講演論文集(CD-ROM) 

    Presentation date: 2017.06

  • メタン・水素・空気予混合気の超希薄旋回火炎の実験的研究

    足立和輝, 上道茜, 西岡牧人

    日本機械学会関東支部総会・講演会講演論文集(CD-ROM) 

    Presentation date: 2017.03

  • MIMO Control of a Diesel Engine Using a Control-Oriented Model

    Y. Yamasaki, R. Ikemura, M. Takahashi, S. Kaneko, A. Uemichi

    SCC 2017, Aachen, Germany 

    Presentation date: 2017

    Event date:
    2017
     
     
  • 音響境界条件を考慮した燃焼振動発振周波数の検討

    上道茜, 金築一平, 金子成彦

    Dynamics & Design Conference (CD-ROM) 

    Presentation date: 2017

    Event date:
    2017
     
     
  • ピッチング加振を受ける水平円筒容器内スロッシングの共振波高に対する多孔板の減衰効果のCFDを用いた評価

    新木悠斗, 上道茜, 山崎由大, 金子成彦

    Dynamics & Design Conference (CD-ROM) 

    Presentation date: 2017

    Event date:
    2017
     
     
  • NOx prediction model for diesel engine control

    Takahashi M, Miura M, Ikemura R, Yamasaki Y, Uemichi A, Kaneko S

    COMODIA 2017 - 9th International Conference on Modeling and Diagnostics for Advanved Engine Systems 

    Presentation date: 2017

  • Prediction model of mechanical loss in turbocharger

    Sakagami S, Uemichi A, Yamasaki Y, Kaneko S

    COMODIA 2017 - 9th International Conference on Modeling and Diagnostics for Advanved Engine Systems 

    Presentation date: 2017

  • Combustion oscillation in gas turbine combustor for fuel mixture of hydrogen and natural gas

    Uemichi A, Kanetsuki I, Kaneko S

    American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP 

    Presentation date: 2017

  • Combustion and Exhaust Characteristics of a Methane-Fueled Rich SI Engine

    KAKIGI Sho, MIYOSHI Masaki, YAMASAKI Yudai, UEMICHI Akane, KANEKO Shigehiko

    The Proceedings of the National Symposium on Power and Energy Systems 

    Presentation date: 2017

     View Summary

    <p>Fuel reforming is one of effective methods to control HCCI combustion, and dedicated EGR is an apposite fuel reforming system for engines. In this research, the combustion and exhaust characteristics of methane-fueled rich SI engine were investigated by experiments in order to realize the HCCI engine with dedicated EGR. In the experiments, equivalence ratio and spark timing were the operation parameters, and in-cylinder pressure and exhaust gas composition were measured. As a result, it was proved that dedicated EGR enables the generation of H2 and CO without decrease of thermal efficiency. On rich SI combustion, an excessive advance of ignition timing causes misfire and instability of the engine. In addition, it was shown that thermal efficiency is one of the main performance indexes of the fuel-reforming cylinder, rather than the mole fraction of H2 and CO in the exhaust gas.</p>

  • Effects of the Multi Injection on a Natural-Gas Dual Fuel Engine

    SAKO Yutaro, YAMASAKI Yudai, UEMICHI Akene, KANEKO Shigehiko

    The Proceedings of the National Symposium on Power and Energy Systems 

    Presentation date: 2017

     View Summary

    <p>Dual fuel engines (DFE) suffer from considerably high total hydrocarbon emissions and low thermal efficiency due to its poor combustion at low loads. Also, further improvement of thermal efficiency is needed at high loads. Therefore, in this study, the effect of double diesel fuel injection on the combustion and exhaust emission characteristics of DFE using town gas 13A (natural gas) was investigated in the experiments. The experiments were conducted using a single-cylinder engine and with a common rail injection system, varying the number of fuel injection and injection timings. In lower loads, the combustion was activated by the double injection and both THC emissions and thermal efficiency were improved, especially when the MFB50 was advanced. On the other hand, at higher loads, although the thermal efficiency slightly improved by the double injection, NOx emissions increased. This was because the in-cylinder temperature increased too much as the MFB50 approached top dead center.</p>

  • マイクロフローリアクタを用いた予混合気着火遅れ時間の予測法の検討

    福田豊, 竹島康貴, 上道茜, 山崎由大, 金子成彦

    燃焼シンポジウム講演論文集 

    Presentation date: 2016.11

  • 水素を大量に含む燃料の燃焼振動現象

    金築一平, 上道茜, 金子成彦

    日本機械学会年次大会講演論文集(CD-ROM) 

    Presentation date: 2016.09

  • マイクロフローリアクターを用いた予混合気着火遅れ時間の推定

    福田豊, 上道茜, 山崎由大, 金子成彦

    日本機械学会年次大会講演論文集(CD-ROM) 

    Presentation date: 2016.09

  • Combustion instability under hydrogen-rich condition

    I. Kanetsuki, A. Uemichi, S. Kaneko

    36th Int. Symp. Combust., WIPP, Seoul, Korea (August 2016) 

    Presentation date: 2016.08

    Event date:
    2016.08
     
     
  • Development of a prediction method for combustion oscillation

    A. Uemichi, I. Kanetsuki, S. Kaneko

    Proc. 11st Int. Conf. Flow-induced vibration and noise, Hague, Netherland, (July 2016) 

    Presentation date: 2016.07

    Event date:
    2016.07
     
     
  • 過濃SI燃焼による筒内燃料改質がメタンHCCI燃焼に及ぼす影響

    三好正城, 山崎由大, 金子成彦, 上道茜

    日本機械学会動力・エネルギー技術シンポジウム講演論文集(CD-ROM) 

    Presentation date: 2016

    Event date:
    2016
     
     
  • ピッチング加振により励起される水平円筒容器内スロッシングと多孔板の減衰効果

    高居明弘, 酒井英充, 酒井英充, 上道茜, 金子成彦

    Dynamics &amp; Design Conference (CD-ROM) 

    Presentation date: 2016

  • 旋回流を用いたメタン空気超希薄予混合燃焼のメカニズムの研究

    蕨一実, 香崎謙人, 上道茜, 嶋村耕平, 西岡牧人

    燃焼シンポジウム講演論文集 

    Presentation date: 2015.11

  • Proposal of a Criterion for Combustion Oscillation Considering Fuel Flexibility

    Akane Uemichi, Riku Machida, Shigehiko Kaneko

    IGTC2015,International Gas Turbine Congress, Toranomon Hills Forum, Tokyo, Nov.15-20, 2015. 

    Presentation date: 2015.11

    Event date:
    2015.11
     
     
  • G0700201 Study on ignition characteristics of premixed gas with EGR or Dedicated EGR in a micro flow reactor

    HAYASHI Takuya, UEMICHI Akane, YAMASAKI Yudai, KANEKO Shigehiko

    Mechanical Engineering Congress, Japan 

    Presentation date: 2015.09

     View Summary

    Effects of large-amount dilutions of exhaust gas recirculation (EGR) and dedicated-EGR (DEGR) on the ignition characteristics of stoichiometric methane-air premixed air were experimentally studied by using a micro flow reactor. The flames were formed for various EGR/DEGR ratios and equivalence ratios Φ_A in the DEGR cylinder Stable flames and oscillating flames were observed; the combustion characteristics varied because the mixtures were highly diluted with EGR/DEGR gases. Their ignition temperatures were defined by the positions of the flames referred to a measured temperature profile in the quartz tube. Since EGR gas is composed of inert species such as N_2 and CO_2, the ignition temperatures of the premixed gas with EGR gas were higher than that without EGR gas; the EGR gas dilution interferes the ignition timing in reciprocating engines. On the other hand, the ignition temperature of the premixed gas with the dilution of DEGR gas whose equivalence ratios correspond to Φ_A = 1.6 and 1.8 were lower than that with EGR gas. This is because highly-reactive intermediate species such as H_2 and CO. Particularly, the ignition temperatures of the premixed gases highly diluted (40%) with DEGR gas of Φ_A = 1.6 and 1.8 were lower than that without EGR gas or DEGR gas. Therefore, it was found that gases with DEGR have potential for shorting the ignition delay.

  • 613 Combustion Oscillation in Gas Turbine Combustor Considered Pipe Arrangement

    MACHIDA Riku, UEMICHI Akane, KANEKO Shigehiko

    Dynamics and Design Conference : D & D 

    Presentation date: 2015.08

     View Summary

    Combustion oscillation is investigated experimentally and theoretically in order to predict combustion oscillation for various fuel mixture conditions. To grasp the characteristics of combustion oscillation, combustion experiments were performed in the mockup combustor of micro gas turbine combustor with high swirl number Sw=2.42. Experimental result shows that two types of oscillation were observed: one is piping oscillation whose frequencies are mostly under 100 Hz and the other is combustion oscillation whose frequencies are over 400 Hz. We also found that frequency suddenly shifts to higher frequency about 600 Hz when hydrogen ratio is large. This phenomenon is supposed to be processing vortex core (PVC) because of whirling of vortex core. Since RMS value of pressure due to combustion oscillations obtained by the experiments and calculated laminar flame speed has common characteristics, pressure interaction index was modified due to relationships among laminar flame speed, pressure, density, and heat release rate; the pressure interaction index can be described as a function of laminar flame speed. Then, we proposed the criterion of the growth rate for judgment of combustion oscillation occurrence based on n-z model. This modified criterion could be much successfully judged combustion oscillations than the previous model using the constant value of the pressure interaction index 0.05. However, the criterion is very sensitive about frequency.

  • Ultralean Hydrogen-Air Premixed Flame in Swirl Flow

    Akane Uemichi, Kento Kouzaki, Kazunori Warabi, Kohei Shimamura, Makihito Nishioka

    10th Asia-Pacific Conference on Combustion  (Jiuhua Resort & Convention Center, Beijing, China) 

    Presentation date: 2015.07

  • Characteristics of combustion oscillation observed in a micro gas turbine combustor fuelled by biomass gas

    S. Kaneko, R. Machida, A. UEMICHI, H. Hwang, T. Ono, R. Kitamura

    3rd Symposium on Fluid-Structure-Sound Interaction and Control  (Curtin University, Perth, Australia) 

    Presentation date: 2015.07

  • Proposal of an evaluate formula for combustion oscillation considered an effect of laminar flame speed

    Akane Uemichi, Riku Machida, Shigehiko Kaneko

    The 4th Korea-Japan Joint Symposium on Dynamics & Control  (Pusan, Korea) 

    Presentation date: 2015.05

  • Proposal of an Evaluate Formula for Combustion Oscillation Considered an Effect of Laminar Flame Speed

    Akane Uemichi, Riku Machida, Shigehiko Kaneko

    Proceedings of The 4th Korea-Japan Dynamics Symposium, May 21-22 

    Presentation date: 2015.05

    Event date:
    2015.05
     
     
  • Ultralean hydrogen-air premixed flame in swirl flow

    Akane Uemichi, Kento Kouzaki, Kazunori Warabi, Kohei Shimamura, Makihito Nishioka

    ASPACC 2015 - 10th Asia-Pacific Conference on Combustion 

    Presentation date: 2015

    Event date:
    2015
     
     
  • マイクロフローリアクターによる排気再循環を伴う予混合気の自己着火特性の把握

    林卓哉, 上道茜, 山崎由大, 金子成彦

    日本機械学会年次大会講演論文集(CD-ROM) 

    Presentation date: 2015

    Event date:
    2015
     
     
  • 配管を考慮したガスタービン燃焼器内で発生する燃焼振動

    町田陸, 上道茜, 金子成彦

    Dynamics & Design Conference (CD-ROM) 

    Presentation date: 2015

    Event date:
    2015
     
     
  • 微量燃料添加による疑似バイオガス噴流拡散火炎保持性能強化に関する研究

    鷲見祐典, 上道茜, 西岡牧人

    燃焼シンポジウム講演論文集 

    Presentation date: 2015

    Event date:
    2015
     
     
  • 旋回流を用いた超希薄水素空気予混合燃焼メカニズムの研究

    香崎謙人, 蕨一実, 上道茜, 嶋村耕平, 西岡牧人

    燃焼シンポジウム講演論文集 

    Presentation date: 2015

    Event date:
    2015
     
     
  • 旋回流中で形成される超過濃火炎

    上道茜, 山崎由大, 金子成彦

    燃焼シンポジウム講演論文集 

    Presentation date: 2015

    Event date:
    2015
     
     
  • 既燃ガスの逆流を利用した超低品位燃料の予混合燃焼に関する研究

    小曽戸誠知, 安田健太, 上道茜, 本澤尚史, 鍵屋慎一, 西岡牧人

    燃焼シンポジウム講演論文集 

    Presentation date: 2015

    Event date:
    2015
     
     
  • 旋回流中に形成される超希薄水素火炎

    上道茜, 香崎謙人, 蕨一実, 嶋村耕平, 西岡牧人

    日本伝熱シンポジウム講演論文集(CD-ROM) 

    Presentation date: 2015

    Event date:
    2015
     
     
  • 急拡大型旋回流バーナによる超希薄燃焼の研究

    蕨一実, 香崎謙人, 橋本一輝, 上道茜, 嶋村耕平, 西岡牧人

    燃焼シンポジウム講演論文集 

    Presentation date: 2014.11

  • 回転対向流双子火炎におけるプロパン空気超過濃燃焼

    上道茜, 山崎由大, 金子成彦

    燃焼シンポジウム講演論文集 

    Presentation date: 2014.11

  • I112 Study on Flame Stretch for Rotating Counterflow Twin Flame

    Kozaki Kento, Uemichi Akane, Nishioka Makihito

    Procee[d]ings of Thermal Engineering Conference 

    Presentation date: 2014.11

     View Summary

    Effect of flame stretch on CH_4/air ultra lean co-rotation counter flow premixed flame was investigated by numerical simulation. Counterflow twin flame and co-rotating counterflow twin flame were compared. The result shows that the flame stretch under ultra lean conditions is very small. In the case of ultra lean conditions of co-rotation counterflow twin flames, local burning velocity and radial velocity gradient at the flame front are very small. They are extremely small compared to those of non-rotating counterflow twin flames and ordinary lean co-rotating counterflow twin flames. In addition, the flow velocity at the flame front is also small. We could not determine whether co-rotating counterflow twin flame suffers the effects of flame stretch or not, since the flow fields of these flames are different significantly.

  • 208 The Research in the Characteristic of Combustion Oscillations in the Combustor of the Micro Gas Turbine

    MACHIDA Riku, HWANG Hosung, ONO Takuya, KITAMURA Ryohei, UEMICHI Akane, KANEKO Shigehiko

    Dynamics and Design Conference : D & D 

    Presentation date: 2014.08

     View Summary

    In this study, characteristics of combustion oscillation generated in gas turbine combustor are numerically and experimentally investigated. Numerical analyses are performed with two different methods: Combined EBU method and Comparison PDF Transport method. These numerical results provide important parameters such as delay time. Stability criterion for combustion oscillation is evaluated by the combination of numerical analysis technique and the evaluation formula proposed by Z. M. Ibrahim. Experimental conditions are selected to investigate the condition of combustion oscillation excitation mechanism by changing experimental parameter such as composition of the fuel, equivalence ratios and swirl numbers. As a result, with increasing the rate of hydrogen in fuel or the swirl numbers, combustion oscillation is likely to occur and combustion oscillation occur under the conditions of specific equivalence ratios in the experiment. Finally, experimental results are compared with numerical analyses. A trend of natural frequency to the change of equivalence ratio and the range of equivalence ratios which combustion oscillation occurs by the numerical analysis is in good agreement with those by the experiment.

  • 回転対向流双子火炎における火炎伸張に関する研究

    香崎謙人, 上道茜, 西岡牧人

    日本機械学会熱工学コンファレンス講演論文集(CD-ROM) 

    Presentation date: 2014

    Event date:
    2014
     
     
  • 超希薄条件の回転対向流双子火炎における圧力の影響

    上道茜, 大崎靖雄, 西岡牧人

    日本伝熱シンポジウム講演論文集(CD-ROM) 

    Presentation date: 2014

  • マイクロガスタービン燃焼器内で発生する燃焼振動の特性に関する研究

    町田陸, HWANG Hosung, 大野卓也, 北村遼平, 上道茜, 金子成彦

    Dyn Des Conf (CD-ROM) 

    Presentation date: 2014

  • 回転対向流双子火炎における超希薄燃焼メカニズムの解明

    上道茜, 西岡牧人

    燃焼シンポジウム講演論文集 

    Presentation date: 2013.11

  • 旋回流を用いたメタン‐空気超希薄予混合燃焼の研究

    相澤宏紀, 上道茜, 西岡牧人

    燃焼シンポジウム講演論文集 

    Presentation date: 2013.11

  • 旋回流を用いた超希薄条件における水素‐空気予混合燃焼の研究

    服部巧, 上道茜, 田中裕梨, 西岡牧人

    燃焼シンポジウム講演論文集 

    Presentation date: 2013.11

  • Numerical Study on Ultra-Lean Combustion by Using Stagnation Flow Swirl Burner

    Akane,Uemichi, Hiroki,Aizawa, Takumi,Hattori, Nishioka,Makihito

    Proceedings of the 24th International Colloquium on the Dynamics of Explosions and Reactive System 

    Presentation date: 2013.08

    Event date:
    2013.08
     
     
  • 旋回流を用いた超希薄条件における水素-空気予混合燃焼の研究

    服部巧, 上道茜, 田中裕梨, 西岡牧人

    燃焼シンポジウム講演論文集 

    Presentation date: 2013

    Event date:
    2013
     
     
  • 旋回流を用いたメタン-空気超希薄予混合燃焼の研究

    相澤宏紀, 上道茜, 西岡牧人

    燃焼シンポジウム講演論文集 

    Presentation date: 2013

    Event date:
    2013
     
     
  • 旋回流を用いた超希薄予混合燃焼の研究(第3報)―よどみ流型旋回バーナを用いた研究―

    相澤宏紀, 上道茜, 西岡牧人

    燃焼シンポジウム講演論文集 

    Presentation date: 2012.11

  • 旋回流を用いた超希薄予混合燃焼の研究(第4報)-水素空気回転対向流双子火炎の希薄可燃範囲の拡大-

    上道茜, 相澤宏紀, 西岡牧人

    燃焼シンポジウム講演論文集 

    Presentation date: 2012

    Event date:
    2012
     
     
  • 旋回流を用いた超希薄予混合燃焼の研究(第3報)-よどみ流型旋回バーナを用いた研究-

    相澤宏紀, 上道茜, 西岡牧人

    燃焼シンポジウム講演論文集 

    Presentation date: 2012

    Event date:
    2012
     
     
  • E115 Counterflow Flame of Premixed Gas and Burned Gas with Addition of Radicals

    Uemichi Akane, Nishioka Makihito

    Procee[d]ings of Thermal Engineering Conference 

    Presentation date: 2011.10

     View Summary

    Counterflow of methane-air premixed gas and burned gas with active radicals are calculated with detailed kinetics. It was found that the effects of addition of radicals on extinction limits and flame structure are not significant. There are small difference between addition and no addition of radicals. Furthermore, due to the strong radial-direction flow, added radicals are transported to radial direction by convection and diminished. Meanwhile, temperature of countering burned gas has a dominant effect on sustaining premixed flames. High-temperature burned gas affects weak flame and its extinction limits are extended. These results agree well with the results of counterflow flames of propane-air premixed gas and burned gas conducted by Darabiha et al. [Darabiha, N., et al., Combust. Sci. Tech., 60 (1988), 267.].

  • Numerical Study on Ultra-Lean Premixed Flame in Swirl Flow with Recirculating of Burned Gas including Active Radicals

    Akane Uemichi, Yasuo Kondo, Makihito Nishioka

    23rd International Colloquium on the Dynamics of Explosions and Reactive Systems 

    Presentation date: 2011.07

  • Study on the Effect of Premixed Gas Addition on the Anti-Blow-Off Performance of Jet Diffusion Flame

    Makihito Nishioka, Kosuke Miyazaki, Hiroki Takayama, Akane Uemichi

    23rd International Colloquium on the Dynamics of Explosions and Reactive Systems 

    Presentation date: 2011.07

  • Mechanism of Ultra-Lean Premixed Combustion in a Swirling Flow

    Akane Uemichi, Yasuo Kondo, Makihito Nishioka

    13th International Conference on Numerical Combustion 

    Presentation date: 2011.04

  • ラジカルを添加した燃焼ガスと予混合気の対向流火炎の研究

    上道茜, 西岡牧人

    日本機械学会熱工学コンファレンス講演論文集 

    Presentation date: 2011

    Event date:
    2011
     
     
  • 旋回流を用いた超希薄予混合燃焼の研究(第2報)-既燃ガス再循環によって強化されたメタン空気予混合火炎の火炎構造および燃焼メカニズムの解明-

    上道茜, 相澤宏紀, 西岡牧人

    燃焼シンポジウム講演論文集 

    Presentation date: 2011

    Event date:
    2011
     
     
  • 1-D and 2-D Ultra-Lean Flame Structure by Recirculation of Burned Gas in Swirling Flow

    Akane Uemichi, Makihito Nishioka

    8th Asia-Pasific Conference on Combustion 

    Presentation date: 2010.12

  • Ultra-Lean Combustion Using Burned Gas Recirculation Generated by Swirl Flow

    Uemichi Akane, Nishioka Makihito

    Proceedings, ... meeting of Japan Society of Fluid Mechanics 

    Presentation date: 2010.09

     View Summary

    Ultra-lean combustion has been attracting attentions because the emission of CO_2 and NOx would be very low if it realized. We simulated rotating counterflow twin premixed flames and succeeded in forming a further ultra-lean flame of φ=0.32. These flame structures are quite different from general 1-D premixed flame. There are additional stagnation points near the upstream end of the preheat zone due to the backward flow of the burned gas caused by the centrifugal force. In the case of ultra-lean combustion, reactive species of premixed gas are transported by diffusion over the stagnation po...

  • 1-D and 2-D Ultra-Lean Flame Structure by Recirculation of Burned GAs in Swirling Flow

    A., Uemichi, M., Nishioka

    Proceedings of the Eighth Asia-Pacific Conference on Combustion 

    Presentation date: 2010.01

    Event date:
    2010.01
     
     
  • 1次元および2次元数値計算による旋回流中超希薄予混合火炎の研究

    上道茜, 西岡牧人

    数値流体力学シンポジウム講演論文集(CD-ROM) 

    Presentation date: 2010

    Event date:
    2010
     
     
  • 旋回流を用いた超希薄予混合燃焼の研究

    上道茜, 近藤靖雄, 西岡牧人

    燃焼シンポジウム講演論文集 

    Presentation date: 2010

    Event date:
    2010
     
     
  • Steadiness of Oblique Detonation Waves around Spherical Projectiles

    Akane Uemichi, Sinpei Kato, Jiro Kasahara, Akiko Matsuo

    22nd International Colloquium on the Dynamics of Explosions and Reactive Systems 

    Presentation date: 2009.07

  • Study on Propagation Characteristics of the Shock Waves Driven by Gaseous Detonation Waves

    Sinpei Kato, Satoru Hashimoto, Akane Uemichi, Jiro Kasahara, Akiko Matsuo

    22nd International Colloquium on the Dynamics of Explosions and Reactive Systems 

    Presentation date: 2009.07

  • 極超音速飛行体まわりの斜めデトネーション波可視化実験研究

    上道茜, 加藤真平, 笠原次郎, 松尾亜紀子

    衝撃波シンポジウム講演論文集 

    Presentation date: 2009

    Event date:
    2009
     
     
  • 気体デトネーション駆動衝撃波の伝播特性に関する研究

    加藤真平, 上道茜, 笠原次郎, 亀田敏弘, 松尾亜紀子

    衝撃波シンポジウム講演論文集 

    Presentation date: 2009

    Event date:
    2009
     
     
  • New-Style Class of Water Rocket by Using Flight Simulation

    Masashi Miura, Yosuke Nambu, Masaaki Sugimoto, Akane Uemichi, Hajime Yokota

    51st UKAREN 

    Presentation date: 2007.11

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Syllabus

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Teaching Experience

  • Engineering thermo dynamics

    Waseda University  

    2020.09
    -
    Now
     

  • Mechanical engineering labratory Fundamentals

    Waseda University  

    2020.04
    -
    Now
     

  • Seminar

    Waseda University  

    2020.04
    -
    Now
     

  • Engineering practice

    Waseda University  

    2020.04
    -
    Now
     

  • Fundamental experiment 2A (Modern Mechanical Engineering)

    Waseda University  

    2020.04
    -
    Now
     

  • Mechanical engineering labratory Advanced

    Waseda University  

    2020.04
    -
    Now
     

  • 学生実験I「ガソリン機関の分解・組立」

    東京農工大学工学部機械システム工学科  

    2019.04
    -
    2020.03
     

  • Fluid Structure Interaction -Modeling and Design

    The University of Tokyo, The Graduate School of Engineering, Department of Mechanical Engineering  

    2015.04
    -
    2019.03
     

  • 初年次ゼミナール理科「未来のエネルギーを考える」

    東京大学教養学部  

    2015.04
    -
    2019.03
     

  • 機械力学制御演習[支援]

    東京大学工学系研究科機械工学専攻  

    2014.04
    -
    2019.03
     

  • 創造設計演習(メカトロ演習)

    東京大学工学部機械工学科  

    2014.04
    -
    2019.03
     

  • 機械工学総合演習第二(ガスエンジン実験)

    東京大学工学部機械工学科  

    2014.04
    -
    2019.03
     

  • GMSI-GSDM Summer Camp

    The University of Tokyo, The Graduate School of Engineering, Department of Mechanical Engineering  

    2014.04
    -
    2016.03
     

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Committee Memberships

  • 2022.05
    -
    Now

    一般社団法人ターボ機械協会  代議員

  • 2019.04
    -
    Now

    エネルギー・資源学会  オータムワークショップ幹事

  • 2019.04
    -
    Now

    東京都環境局  東京都低NOx・低CO2小規模燃焼機器認定委員会

  • 2015.01
    -
    2019.03

    日本燃焼学会  若手・女性コミュニティ創出タスクフォースメンバー

  • 2015.01
    -
    2015.11

    日本燃焼学会  第53回燃焼シンポジウム実行委員

  • 2014.04
    -
    2015.03

    日本自動車技術会  ガソリン機関部門委員会

  • 2013.12
    -
    2014.03

    日本燃焼学会  平成25年度先進的燃焼技術の調査研究委員会

  • 2013.01
    -
    2013.03

    日本燃焼学会  平成24年度先進的燃焼技術の調査研究委員会

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Media Coverage

  • 【インタビュー】専門性の川を越えて〜プロジェクト間連携の試み〜

    Internet

    Author: Other  

    科学技術イノベーション政策のための科学研究開発プログラム   POLICY DOOR  

    https://www.jst.go.jp/ristex/stipolicy/policy-door/interview-05.html  

    2022.03