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This research has investigated the above-mentioned process resulting in cavitation erosion step by step.

Research Project

Project/Area Number 09450372
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 船舶工学
Research InstitutionThe University of Tokyo

Principal Investigator

KATO Hiroharu  The University of Tokyo, Environmental & Ocean Eng., Prof., 大学院・工学系研究科, 教授 (00010695)

Co-Investigator(Kenkyū-buntansha) MAEDA Masatsugu  The University of Tokyo, Environmental & Ocean Eng., Assistant, 大学院・工学系研究科, 助手 (60219277)
KOMURA Takashi  The University of Tokyo, Environmental & Ocean Eng., Assistant, 大学院・工学系研究科, 助手 (10010894)
SATO Tohru  The University of Tokyo, Environmental & Ocean Eng., Assoc.Prof., 大学院・工学系研究科, 助教授 (30282677)
MIYATA Hideki  The University of Tokyo, Environmental & Ocean Eng., Prof., 大学院・工学系研究科, 教授 (70111474)
YAMAGUCHI Hajime  The University of Tokyo, Environmental & Ocean Eng., Assoc.Prof., 大学院・工学系研究科, 助教授 (20166622)
Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥14,100,000 (Direct Cost: ¥14,100,000)
Fiscal Year 1998: ¥5,400,000 (Direct Cost: ¥5,400,000)
Fiscal Year 1997: ¥8,700,000 (Direct Cost: ¥8,700,000)
Keywordscavitation / Erosion / Prediction / Impact Pressure / Bubble Collapse / Sheet Cavitation / Cloud Cavitation / 壊食 / クラウド / 気泡 / 衝撃力 / 蒸発 / ホログラフィ
Research Abstract

In terms of the total volume of sheet cavity, which turns into the total vapor volume of initial cloud cavity, it is necessary to know evaporation rate at the sheet cavity surface which is vapor/liquid interface. Thus, the evaporation rate at cavity surface has been predicted by measuring the temperature distribution along a sheet cavity generated in high temperature and high pressure water where the thermodynamic effect due to evaporation appears more clearly.
Using a high speed video, the whole cavity behavior has been observed in detail. The frequency of cloud cavity shedding and the size and shape of the clouds have been measured. Also, a laser holography technique has been applied to measure the number and size of the bubbles in a could cavity.
Cavitation impact force sensors developed and fabricated by ourselves have been used to measure the impactive forces due to collapse of cloud cavities. A high speed video has been taken at the same time with frame rate of 40,500 fps. Behavior of cloud cavity collapse has been investigated in detail with correlation to the time history of the impact force taken into account.

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (23 results)

All Other

All Publications (23 results)

  • [Publications] 金野祥久,加藤洋治,他: "キャビテーション壊食量の推定法(第2報 : 気泡群崩壊による衝撃力頻度分布計測の信頼性評価)" 日本造船学会論文集. 184号. 15-26 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 多賀谷義典,加藤洋治,他: "シートキャビテーションに対する熱的影響に関する研究,ターボ機械" ターボ機械. Vol.26. 513-521 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 川並康剛,加藤洋治,他: "キャビティ内の気泡分布について" 第9回キャビテーションに関するシンポジウム講演論文集. 131-13〓 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 多賀谷義典,加藤洋治,他: "キャビティ内温度降下量の計測" 第9回キャビテーションに関するシンポジウム講演論文集. 83-86 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Y.Kawanami,H.Kato,et al.: "Three-Dimensional Characteristics of the Cavities Formed on a Two-Dimensional Hydrofoil" Proc.3rd Int.Symp.on Cavitation, Grenoble. Vol.1. 191-196 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Hiroharu Kato: "Complex Structure on Sheet-Cloud Cavitation" Proc.8rd Intern.Conf.on Pumps and Fans, Tsinghua University, Beijing. 1-12 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Akihisa Konno, Hiroharu Kato, Hajime Yamaguchi and Masatsugu Maeda: "Prediction of Cavitation Erosion" (2nd Report : Validation of Measured Impulsive Force by Cavitation Bubble Collapse) , J.Soc.Nav.Archi.Japan, (Japanese). Vol.184. 15-26 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Yoshinori Tagaya, Hiroharu Kato, Hajime Yamaguchi, Masatsugu Maeda: "A Study of Thermal Effect on Sheet Cavitation" J.Turbomachinery Soc.Jpn.Vol.26, No.9. 513-521 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Yasutaka Kawanami, Hiroharu Kato, Hajime Yamaguchi, Masatsugu Maeda: "Bubble Distribution in a Cloud Cavity" Proc.9th Symposium on Cavitation, Sendai, 1997. 131-134 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Yoshinori Tagaya, Hiroharu Kato, Hajime Yamaguchi, Masatsugu Maeda: "Measurement of Temperature Depression in Cavity" Proc.9th Symposium on Cavitation, Sendai, 1997. 83-86 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] No.5 : Yasutaka Kawanami, Hiroharu Kato and Hajime Yamaguchi: "Three-Dimensional Characteristics of the Cavities Formed on a Two-Dimensional Hydrofoil" Proc.3rd Int.Symp.on Cavitation, Grenoble 1998 (English). Vol.1. 191-196 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] No.6 : Hiroharu Kato, Complex Structure on Sheet-Cloud Cavitation: Proc.8rd Intern.Conf.on Pumps and Fans, Tsinghua University, Beijing, 1998 (English). 1-12 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 金野祥久, 加藤洋治, 他: "キャビテーション壊食量の推定法 (第2報:気泡群崩壊による衝撃力頻度分布計測の信頼性評価)" 日本造船学会論文集. 184号. 15-26 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 多賀谷義典, 加藤洋治, 他: "シートキャビテーションに対する熱的影響に関する研究, ターボ機械" ターボ機械. Vol.26. 513-521 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 川並康剛, 加藤洋治, 他: "キャビティ内の気泡分布について" 第9回キャビテーションに関するシンポジウム講演論文集. 131-134 (1997)

    • Related Report
      1998 Annual Research Report
  • [Publications] 多賀谷義典, 加藤洋治, 他: "キャビティ内温度降下量の計測" 第9回キャビテーションに関するシンポジウム講演論文集. 83-86 (1997)

    • Related Report
      1998 Annual Research Report
  • [Publications] Y.Kawanami, H.Kato, et al.: "Three-Dimensional Characteristics of the Cavities Formed on a Two-Dimensional Hydrofoil" Proc.3rd Int.Symp.on Cavitation, Grenoble. Vol.1. 191-196 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Hiroharu Kato: "Complex Structure on Sheet-Cloud Cavitation" Proc.8rd Intern.Conf.on Pumps and Fans, Tsinghua University, Beijing. 1-12 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 多賀谷義典、加藤洋治、他: "キャビティ内温度降下量の計測" キャビテーションに関するシンポジウム(第9回). 83-86 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 川並康剛、加藤洋治、他: "クラウド・キャビテイ内の気泡分布について" キャビテーションに関するシンポジウム(第9回). 131-134 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Y.Kawanami, H.Kato,et al.: "Three-dimensional characterstics of the cavities formed on a two-dimensional hydrofoil" 3rd Int.Symposium on Cavitation. (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] Y.Kawanami, H.Kato,et al.: "Evaporation rate at sheet cavity interface" 3rd Int.Symposium on Cavitation. (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] A.Konno, H.Kato,et al.: "Observation of cavitaion bubble collapse by high-speed video" 3rd Asian Symposium on Visualization. (1998)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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