Updated on 2024/04/20

写真a

 
YAMAMOTO, Katsuhiro
 
Affiliation
Faculty of Science and Engineering
Job title
Professor Emeritus
Degree
工博(早大) ( 早稲田大学 )

Research Experience

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    Waseda University Faculty of Science and Engineering   Professor

Committee Memberships

  • 2003
    -
    2004

    （社）日本ガスタービン学会  理事

  • 2003
    -
    2004

    ターボ機械協会  理事

  • 2003
    -
    2004

    （社）可視化情報学会  副会長

  • 2003
    -
    2004

    Gas Turbine Society of Japan  director

  • 2003
    -
    2004

    Turbomachinery Society of Japan  director

  • 2003
    -
    2004

    Visualization Society of Japan  vice-president

  • 2002
    　
    　

    （社）日本機械学会  流体工学部門編集委員会委員長

  • 2002
    　
    　

    Japanese Society of Mechanical Enginners  Chairperson of Editorial Board of Fluid Engineering Division

  • 2000
    -
    2001

    日本ウォータージェット学会  会長

  • 2000
    -
    2001

    Water Jet Technology Siciety  president

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Professional Memberships

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    （社）日本フルードパワーシステム学会

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    （社）日本ガスタービン学会

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    ターボ機械協会

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    （社）可視化情報学会

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    日本ウォータージェット学会

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    （社）日本機械学会

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    Fluid Power System Society

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    Gas Turbine Society of Japan

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    Turbomachinery Society of Japan

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    Visualization Society of Japan

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    Water Jet Technology Siciety

  • 　
    　
    　

    Japanese Society of Mechanical Enginners

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Research Areas

  • Mechanics and mechatronics / Fluid engineering

Research Interests

  • 流体関連振動

  • 高速液体噴流

  • 非定常気液二相流

  • 流体過渡現象

  • Mechanics & Control Engineering

  • Fluid Engineering

  • Flow Induced Vibration

  • Unsteady Gas-Liqui Two Phase Flow

  • Fluid Transients

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Awards

  • ターボ機械協会賞（論文賞）

    2005  

 

Research Projects

  • 市街地道路の交通流解析

  • 軸方向水流中の弾性回転軸の振動問題

  • 高速流体噴流に関する研究

    科学研究費補助金

  • 流体過渡現象に関する研究

    共同研究

  • Trafic flow in urban area

  • Vibration of flexible roter in axial water flow

  • High-Speed Water Jet

    Grant-in-Aid for Scientific Research

  • Fluid Transients

    Cooperative Research

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Misc

  • Impingement of Supersonic Impulse Water Jet on Solid Material

    Yamamoto Katsuhiro, Noguchi Taro

    Transactions of the Visualization Society of Japan   28 ( 11 ) 78 - 85  2008

    　View Summary

    A piston impact against a water column which is filled in a convergent nozzle can produce a high-speed impulse water jet. We analyze the behavior of such water jets with velocity of 500 m/s class in the atmosphere and its impingement on rigid wall by CIP method. The computational results are compared with the jet photograph taken by colored Schlieren method and deformation of aluminum specimen with the jet impact. Then, collision and break up of the water jets as well as shock waves around the jet are well simulated. As for the impingement of the water jet on a solid wall, it is shown that the aluminum crater is made mainly with water hammer pressure due to the jet impact. The computational result gives an explanation for the experimental fact that the crater gets deeper as the specimen is put far from the nozzle.

    DOI CiNii

  • Influence of small amount of air on fluid transients in horizontal pipeline (Part1 In case of concentrated air in a part of pipeline)

    Fuminori ETOH, Satoshi KAMEYAMA, Kazutishi ARAI, Katsuhiro YAMAMOTO

    Proc. of 23th IAHR Simposium on Hydraulic Machinery and System    2006

  • Influence of small amount of air on fluid trasients in holizontal pipeline(Part2 In case of distributed air bubbles along pipeline)

    Satoshi KAMEYAMA, Fuminori ETOH, Kazutoshi ARAI, Katsuhiro YAMAMOTO

    Proc. of 23th IAHR Simposium on Hydraulic Machinery and System    2006

  • Influence of small amount of air on fluid transients in horizontal pipeline (Part1 In case of concentrated air in a part of pipeline)

    Fuminori ETOH, Satoshi KAMEYAMA, Kazutishi ARAI, Katsuhiro YAMAMOTO

    Proc. of 23th IAHR Simposium on Hydraulic Machinery and System    2006

  • Influence of small amount of air on fluid trasients in holizontal pipeline(Part2 In case of distributed air bubbles along pipeline)

    Satoshi KAMEYAMA, Fuminori ETOH, Kazutoshi ARAI, Katsuhiro YAMAMOTO

    Proc. of 23th IAHR Simposium on Hydraulic Machinery and System    2006

  • Transient Analysis of Gas-Liquid Two-Phase Flow in a Horizontal Pipeline using the Discrete Bubble Model

    Yusuke IMAI, Nao KOBAYASHI, Satoshi KAMEYAMA, Fuminori ETO, Kazutoshi ARAI, Katsuhiro YAMAMOTO

    Proc．of 7th International Symposium on Experimental & Computational Aerothermodynamics of Internal Flows   Vol.2   555 - 560  2005

  • Behavior of High-Speed Pulse Water Jets in the Atmosphere

    Naoaki TAKAICHI, Naoya SHIGEMORI, Katsuhiro YAMAMOTO

    Proc of Int.Conf.on Jets,Wakes and Separated Flows   ICJWSF-2005 JSME No.05-201   343 - 348  2005

  • Transient Analysis of Gas-Liquid Two-Phase Flow in a Horizontal Pipeline using the Discrete Bubble Model

    Yusuke IMAI, Nao KOBAYASHI, Satoshi KAMEYAMA, Fuminori ETO, Kazutoshi ARAI, Katsuhiro YAMAMOTO

    Proc．of 7th International Symposium on Experimental & Computational Aerothermodynamics of Internal Flows   Vol.2   555 - 560  2005

  • Behavior of High-Speed Pulse Water Jets in the Atmosphere

    Naoaki TAKAICHI, Naoya SHIGEMORI, Katsuhiro YAMAMOTO

    Proc of Int.Conf.on Jets,Wakes and Separated Flows   ICJWSF-2005 JSME No.05-201   343 - 348  2005

  • Transient Analysis of Free-Surface-Pressurized Flows by Slot Model with Ceiling : Effect of Up-Scaling on Transient Flow and Eigenvalue Problem

    ARAI Kazutoshi, YAMAMOTO Katsuhiro, FUKUMOTO Shigeru

    Turbomachinery   32 ( 12 ) 721 - 728  2004

    　View Summary

    To analyze transient free-surface-pressurized flows with entrapped air in a drainage system, a virtual slot model with ceiling have been proposed. Using this model, calculations for a reduced model and the actual size model are carried out to examine a scale effect on the transient flow. The results show that up-scaling the system causes the increase in compressibility of entrapped air so that the rate of pressure rise decreases. It is also confirmed that the partial differential equations for the modified slot model have real eigenvalues and then the initial value problem is well-posed when the velocity difference between air and water is not so large. The increase in the velocity difference yields a system having complex eigenvalues, however the well behaved numerical solutions can be obtained since the frictional term in the defferential equations suppress the numerical instability.

    DOI CiNii

  • Transient Analysis of Mixed Free-Surface-Pressurized Flows with Entrapped Air:Part1-Computational Model and Experiment,

    Kazutoshi ARAI, Katsuhiro YAMAMOTO

    Proc. of 4th ASME/JSME JointFluids Engineering Conference,   CD FEDSM2003-45266  2003

  • Transient Analysis of Mixed Free-Surface-Pressurized Flows with Entrapped Air:Part2-Similarity Law and Eigenvalue Problem

    Kazutoshi ARAI, Katsuhiro YAMAMOTO, Mitsuhiro SAITOU, Shigeru FUKUMOTO

    Proc. of 4th ASME/JSME Joint Fluids Engineering Conference,   CD,FEDSM2003-45267  2003

  • Behavior of High-Speed Pulsed Water Jet in Air and Its Drilling Effect on Metal

    Katsuhiro YAMAMOTO, Norihisa HANDA, Kazuyoshi HARADA, Makoto IWASE

    Proc. of 7th Pacific Rim International Conference on Water Jet Technology   CD  2003

  • Transient Analysis of Mixed Free-Surface-Pressurized Flows with Entrapped Air:Part1-Computational Model and Experiment,

    Kazutoshi ARAI, Katsuhiro YAMAMOTO

    Proc. of 4th ASME/JSME JointFluids Engineering Conference,   CD FEDSM2003-45266  2003

  • Transient Analysis of Mixed Free-Surface-Pressurized Flows with Entrapped Air:Part2-Similarity Law and Eigenvalue Problem

    Kazutoshi ARAI, Katsuhiro YAMAMOTO, Mitsuhiro SAITOU, Shigeru FUKUMOTO

    Proc. of 4th ASME/JSME Joint Fluids Engineering Conference,   CD,FEDSM2003-45267  2003

  • Behavior of High-Speed Pulsed Water Jet in Air and Its Drilling Effect on Metal

    Katsuhiro YAMAMOTO, Norihisa HANDA, Kazuyoshi HARADA, Makoto IWASE

    Proc. of 7th Pacific Rim International Conference on Water Jet Technology   CD  2003

  • On Maximum Pressure of Water Hammer with Column Separation

    Hiroaki TAKAKOSI, Sigeru HUKUMOTO, Ryo YAMAMOTO, Katsuhiro YAMAMOTO

    Proc. of 5th JSME-KSME Fluids Engineering Conference     1675 - 1680  2002

  • On Maximum Pressure of Water Hammer with Column Separation

    Hiroaki TAKAKOSI, Sigeru HUKUMOTO, Ryo YAMAMOTO, Katsuhiro YAMAMOTO

    Proc. of 5th JSME-KSME Fluids Engineering Conference     1675 - 1680  2002

  • Two-Fluid Model Approach for Transient Analysis of Free-Surface-Pressurized Flows

    ARAI Kazutoshi, HASEGAWA Youhei, YAMAMOTO Katsuhiro, SHIMIZU Shunsuke

    Transactions of the Japan Society of Mechanical Engineers. Series B.   67 ( 659 ) 1742 - 1748  2001

    　View Summary

    A new computational model is developed here to analyze the influence of entrapped air on free-surface-pressurized flows. A virtual slot with ceiling on the top of the pipe is introduced to treat a separated gas-liquid flow. This model is a modified model of Preissmann's and is applicable not only to open channel flow and closed conduit flow but also pressurized flow with entrapped air. Compared to experimental results using the model of 1/50 scale, the calculation results show that the entrapped air in horizontal pipe advances the time of pressure rising and makes the maximum value of pressure higher. The escape flow of entrapped air at dropshaft is caused by surface waves pushing the air in the horizontal pipe, and then the pipe slope affects the flow rate of air. The air compressibility has less effect on the transient separated air-water flow in the pipe.

    DOI CiNii

  • Transient Analysis for Mixed Free-Surface-Pressure Flows (Estimation of Entrapped Air by Lumped Parameter Model)

    YAMAMOTO Katsuhiro, ARAI Kazutoshi, ASAMIZU Takahiro

    Turbomachinery.   28 ( 6 ) 364 - 371  2000

    DOI CiNii

  • Drilling Characteristics of Ductile Metal by Submerged Water Jets

    Katsuhiro Yamamoto, Hideyuki Goto, Nobuyuki Yamaguchi, Kazuo Fukui, Tomotsuna Yokoyama

    Proc. of 6th Pacific Rim International Conference on Water Jet Technology     175 - 180  2000

  • Drilling Characteristics of Ductile Metal by Submerged Water Jets

    Katsuhiro Yamamoto, Hideyuki Goto, Nobuyuki Yamaguchi, Kazuo Fukui, Tomotsuna Yokoyama

    Proc. of 6th Pacific Rim International Conference on Water Jet Technology     175 - 180  2000

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Internal Special Research Projects

  • 高速ウォータージェットの流動構造の解明とその材料加工への応用

    2004  

    　View Summary

    　本年度は，水中の高速ウォータージェットと大気中の超高速パルス形ウォータージェットについてそれぞれ以下のような実験と数値解析を実施した．(1)キャビテーションジェット　高速キャビテーションジェットの加工能力におよぼすノズルキャップ形状の影響を調べるため，穴径0.155mmのオリフィス形ノズル出口に内径4mm,長さ5-40mmのノズルキャップを取り付け，吐出圧200MPa，噴射時間1200sでアルミニューム試験片による壊食実験を行った．また，キャビテーションジェットの流動特性を理論的に解明するため，大気圧下の静止水中に一定速度の水噴流を噴射したとき生じるノズル出口近傍の流れ場を非圧縮性粘性流れとして数値計算した．その結果，①質量欠損はノズルキャップ長さが10mm以上で急激に減少する，②キャビテーションによる試験片表面の損傷面積はキャップ出口からの距離が30mmを過ぎると，キャップ長さの増加と共に小さくなる，③円筒座標系でHSMAC法を適用し，噴流速度として実験値を与えると高周波の渦発生が認められたが，計算格子点に擬似的なキャビテーション気泡を配置すると計算可能な噴流速度は著しく低下する，こと等が分かった．(2)パルス形ウォータージェット　流速500m/s級の大気中超高速パルス形ウオータージェットを２次元直角座標系でCIP法により数値解析し，シュリーレン法による噴流写真などと比較した．その結果，①CIP法は高速な気中水噴流の挙動解析に有用なスキームである，②気液界面及び気中衝撃波などの不連続面においては1次精度の風上差分を一部併用することで，数値振動や数値拡散を容易に抑制できる，③ノズル出口の流速を一定とするとCumulation方式に，ノズル出口の流速を急激に増加させるとImpact-Extrusion方式に近い噴流が得られる，こと等が分かった．