• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Measurement of cavitation bubble cluster downstream of sheet cavity

Research Project

Project/Area Number 10650899
Research Category

Grant-in-Aid for Scientific Research (C)

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

Principal Investigator

MAEDA Masatsugu  Univ. Tokyo, Environmental & Ocean Eng., Assistant, 大学院・工学系研究科, 助手 (60219277)

Co-Investigator(Kenkyū-buntansha) KOMURA Takashi  Univ. Tokyo, Environmental & Ocean Eng., Assistant, 大学院・工学系研究科, 助手 (10010894)
YAMAGUCHI Hajime  Univ. Tokyo, Environmental & Ocean Eng., Assoc. Prof., 大学院・工学系研究科, 助教授 (20166622)
KATO Hiroharu  Univ. Toyo, Mechanical Engineering, 工学部, 教授 (00010695)
Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 1999: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1998: ¥2,400,000 (Direct Cost: ¥2,400,000)
KeywordsCloud Cavitation / Sheet Cavitation / Foil Section / Laser Holography Method / Cavitation Bubble / Cavitation Bubble Cluster / Bubble Measurement / Re-entrant Jet
Research Abstract

A sheet cavity generated on a body such as hydrofoils begins to oscillate periodically when it attains a certain size, shedding harmful could cavities downstream. The collapse of cloud cavity is a collective collapse of cluster of numerous small bubbles, resulting in impulsive pressure fluctuations which leads to noise, high frequency vibration and erosion of the materials. In this study, we measured the number and spatial distribution of bubbles in cloud cavities downstream of sheet cavity.
A laser holography method was applied to measure the bubbles in cloud cavities on a foil section. In the beginning, it took about 3 months to count the bubbles whose radii are more than 10 μm. Therefore, we measured the bubbles with radii of more than 35 μm mainly. As a result we succeeded in measuring bubbles in 9 cloud cavities for 3 cavitation numbers and 3 foil chord stations. The results can be summarized as follows :
a) Bubbles in cloud exist around a U-shape vortex cavity near the center of cloud particularly downstream of it. Larger bubbles exist more closer to the vortex cavities. This suggests that the vortex cavities split into small bubbles, supplying bubbles around them, when they collapse. It is also seen that there are larger bubbles closer to the foil surface. It is considers that this is attributed to lower pressure close to the foil surface.
b) The bubble number density function is inversely proportional to the bubble radius to power 5.1 when the bubble radius is larger than 35 μm. We obtained an empirical equation of the relation between the bubble number density function and bubble radius.
We also measured evaporation rate at sheet cavity surface, which determines the total vapor volumes of the initial cloud cavity. Also measured are the characteristics of re-entrant jet, which tears off the sheet cavity resulting in could cavity shedding.

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • Research Products

    (29 results)

All Other

All Publications (29 results)

  • [Publications] H. Kato, H. Yamaguchi, et al.: "Laser Holographic Observation of Cavitation Cloud on a Foil Section"J. Visualization, The Visualization Society of Japan and Ohmsha, Ltd.. Vol. 2. 37-50 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 豊田真,山口一,加藤洋治: "バブルキャビテーション時の翼型性能推定"日本造船学会論文集. 第186号. 59-64 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 豊田真,山口一,加藤洋治: "スーパーキャビテーション翼型のシリーズ設計"日本造船学会論文集. 第186号. 65-72 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y. Kawanami, H. Kato, et al.: "Evaporation Rate at Sheet Cavity Interface"Proc. 3rd Int. Symp. on Cavitation, Grenoble, 1998. Vol. 1. 221-226 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Hiroharu Kato: "Research on Cavitation Mechanism by High-Speed Video and Holographic Observations"Proc. 8th Intern. Symp. on Flow Visualization, Solent, Italy, 1998. 1-1-1-11 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] A. Konno, H. Kato, et al.: "Observation of Cavitation Bubble Collapse by High-speed Video"Proceedings of the Fifth Asian Symposium on Visualization (1998), March 8-11 1999, Bedugul Bali, Indonesia. 134-139 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] H. Yamaguchi, H. Kato, et al.: "High Performance Foil Sections with Delayed Cavitation Inception"Proc. Intern. Symp. Cavitation Inception, 3rd ASME/JSME Joint Fluids Eng. Conf., ASME, San Francisco, USA. 1-11 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y. Tagaya, H. Kato, et al.: "Thermodynamic Effect on a Sheet Cavitation"Proc. Cavitation and Multiphase Flow Forum, 3rd ASME/JSME Joint Fluids Eng. Conf., ASME, San Francisco, USA. 1-6 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 前田正二,山口一,他: "プロペラのTip Vortex CavitationのBursting現象"第10回キャビテーションに関するシンポジウム講演論文集,福井. 161-164 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Hiroharu Kato, Hajime Yamaguchi, Masatsugu Maeda, Yasutaka Kawanami and Shogo Nakasumi: "Laser Holographic Observation of Cavitation Cloud on a Foil Section"Journal of Visualization, The Visualization Society of Japan and Ohmsha Ltd.. Vol. 2, No 1.. 37-50 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Makoto Toyoda, Hiroharu Kato, Hajime Yamaguchi: "Prediction of Foil Section Performance in Bubble Cavitation Condition"Journal of the Society of Naval Architects of JAPN. Vol. 186 (Japanese). 59-64 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Makoto Toyoda, Hiroharu Kato, Hajime Yamaguchi: "A Series Design of Supercavitating Foil Sections"Journal of the Society of Naval Architects of JAPN. Vol. 186 (Japanese). 65-72 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Yasutaka Kawanami, Hiroharu Kato, Hajime Yamaguchi, Masatsugu Maeda, Fumiaki Oshima and Jun Doi: "Evaporation Rate at Sheet Cavity Interface"Proc. 3rd Int. Symp. on Cavitation, Grenoble. Vol. 1. 221-226 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Hiroharu Kato: "Research on Cavitation Mechanism by High-Speed Video and Holographic Observations"Proc. 8th Intern. Symp. on Flow Visualization, Solent, Italy, 1998. 1-1-1-11 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Akihisa Konno, Hiroharu Kato, Hajime Yamaguchi and Masatsugu Maeda: "Observation of Cavitation Bubble Collapse by High-speed Video"Proceedings of the Fifth Asian Symposium on Visualization (1998), March 8-11 1999, Bedugul Bali, Indonesia. 134-139 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Hajime Yamaguchi, Hiroharu Kato, Masatsugu Maeda and Makoto Toyoda: "High Performance Foil Sections with Delayed Cavitation Inception"Proc. Intern. Symp. Cavitation Inception, 3rd ASME/JSME Joint Fluids Eng. Conf., ASME, San Francisco, USA, 1999. FEDSM99-7294-1-11. (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Yoshinori Tagaya, Hiroharu Kato, Hajime Yamaguchi and Masatsugu Maeda: "Thermodynamic Effect on a Sheet Cavitation"Proc. Cavitation and Multiphase Flow Forum, 3rd ASME/JSME Joint Fluids Eng. Conf., ASME, San Francisco, USA, 1999. FEDSM99-6772-1-6. (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Masatsugu Maeda, Hajime Yamaguchi, Koichi Shimizu, Kazuaki Wakabayashi, Hiroharu Kato, Shunji Soejima and Norio Ishii: "Bursting Phenomena of Propeller Tip Vortex Cavitation"Proc. 10th Symposium on Cavitation, FukuI. (Japanese). 161-164 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] H.Kato, H.Yamaguchi, et al.: "Laser Holographic Observation of Cavitation Cloud on a Foil Section"J. Visualization, The Visualization Society of Japan and Ohmsha, Ltd.. Vol.2. 37-50 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 豊田真,山口一,加藤洋治: "バブルキャビテーション時の翼型性能推定"日本造船学会論文集. 第186号. 59-64 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 豊田真,山口一,加藤洋治: "スーパーキャビテーション翼型のシリーズ設計"日本造船学会論文集. 第186号. 65-72 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Y.Kawanami, H.Kato, et al.: "Evaporation Rate at Sheet Cavity Interface"Proc. 3rd Int. Symp. on Cavitation, Grenoble, 1998. Vol.1. 221-226 (1998)

    • Related Report
      1999 Annual Research Report
  • [Publications] Hiroharu Kato: "Research on Cavitation Mechanism by High-Speed Video and Holographic Observations"Proc. 8th Intern. Symp. on Flow Visualization, Solent, Italy, 1998. 1-1-1-11 (1998)

    • Related Report
      1999 Annual Research Report
  • [Publications] A.Konno, H.Kato, et al.: "Observation of Cavitation Bubble Collapse by High-speed Video"Proceedings of the Fifth Asian Symposium on Visualization (1998), March 8-11 1999, Bedugul Bali, Indonesia. 134-139 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] H.Yamaguchi, H.Kato, et al.: "High Performance Foil Sections with Delayed Cavitation Inception"Proc. Intern. Symp. Cavitation Inception, 3rd ASME/JSME Joint Fluids Eng. Conf., ASME, San Francisco, USA. 1-11 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Y.Tagaya, H.Kato, et al.: "Thermodynamic Effect on a Sheet Cavitation"Proc.Cavitation and Multiphase Flow Forum, 3rd ASME/JSME Joint Fluids Eng. Conf., ASME, San Francisco, USA. 1-6 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 前田正二,山口一,他: "プロペラのTip Vortex CavitationのBursting現象"第10回キャビテーションに関するシンポジウム講演論文集,福井. 161-164 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Y.Kawanami,H.Kato,et al.: "Evaporation Rate at Sheet Cavity Iterface" Proc.3rd Int.Symp.on Cavitation,Grenoble,1998. 221-226 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Hiroharu Kato: "Research on Cavitation Mechanism by High-Speed Video and Holographic Observations" Proc.8th Intern.Symp.on Flow Visualization,Solent,Italy,1998. 1-1-1-11 (1998)

    • Related Report
      1998 Annual Research Report

URL: 

Published: 1998-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi