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1993 Fiscal Year Final Research Report Summary

Numerical and Experimental Study on Cavity Flow

Research Project

Project/Area Number 04452216
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 船舶抵抗・運動性能・計画
Research InstitutionThe University of Tokyo

Principal Investigator

KATO Hiroharu  The University of Tokyo Faculty of Engineering, Professor, 工学部, 教授 (00010695)

Co-Investigator(Kenkyū-buntansha) MAEDA Masatsugu  The University of Tokyo Assistant, 工学部, 助手 (60219277)
KOMURA Takashi  The University of Tokyo Assistant, 工学部, 助手 (10010894)
MIYATA Hideaki  The University of Tokyo Assistant Professor, 工学部, 助教授 (70111474)
YAMAGUCHI Hajime  The University of Tokyo Assistant Professor, 工学部, 助教授 (20166622)
KAJITANI Hisashi  The University of Tokyo Professor, 工学部, 教授 (80010693)
Project Period (FY) 1992 – 1993
KeywordsCavitation / Finite Span Foil / Finite Difference Method / Viscous Flow / Tip Vortex / Rotating Blade / Bubbly Flow
Research Abstract

The results of this study can be summarized as follows :
1. Computations were made for unsteady viscous cavitating flows around a finite span foil and a rotating blade, using Bubble Two-phase Flow model and a finite difference technique. Since the computations were performed only for low Reynolds numbers, a quantitative agreement with the experimental data was not obtained. However, the computed results expressed the trends of the experiments well, showing the effectiveness of the present flow model for the computation of such flows.
2. The tip vortex does not have a simple structure like a Rankine vortex but consists of two cores caused by the boundary layrs on the upper and lower surfaces of the foil, respectively. This is the reason why a tip vortex cavity has a form of a twisting ribbon.
3. Increasing cavity size on the foil weakens the tip vortex. But the rotation of tip vortex promotes the separation near the foil tip, resulting in larger cavity near the tip area.
4. A cavity lifts up the shear layr, resulting in thicker viscous wake.
5. Flow on a rotating blade goes toward the tip because of centrifugal force. As a result, the flow pattern becomes completely different from that on a straight foil.
6. It has been shown that a grid generation technique is a key for a high Reynolds number computation in addition to adopting an appropriate turbulence model.
7. Accurate experiments were performed using a finite span foil model to measure pressure distribution on the foil and flow field around the foil as well as to observe cavitation. Particularly, the positions and velocity distributions of the tip vortex were measured in detail. These results have been used to clarify the above-mentioned flow structure, together with the detailed analysis of the computed results.

  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] H.Kato: "Numerical Analysis of a Cavitating Hydrofoil with Finite Span" Proc.International Symposium on Propulsors and Cavitation. 164-170 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 高杉信秀: "有限幅直進翼のチップボルテックスキャビテーションについて" キャビテーションに関するシンポジウム(第7回). 7. 105-108 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 高杉信秀: "有限幅直進翼のキャビテーションの実験" 日本造船学会論文集. 172. 257-265 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 岸本謙: "回転翼回りのキャビテーション流場の数値解析" 日本造船学会論文集. 173. 89-95 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.Takasugi: "Study on Cavitating Flow around a Finite Span Hydrofoil" Proc.Cavitation and Multiphase Flow Forum,ASME. 153. 177-182 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 加藤洋治: "翼に発生するキャビテーション研究の進歩" 機械の研究. 45(10). 1027-1034 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Kishimoto: "A Numerical Analysis of Cavitating Flow around a Rotating Blade" J.Ship Research,SNAME. (発表予定).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Kato: "Numerical Analysis of a Cavitating Hydrofoil with Finite Span" Proc.International Symposium on Propulsors and Cavitation. 164-170 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N.Takasugi: "A Tip-Vortex Cavitation around a Finite Span Hydrofoil" Proc.7th Symp. Cavitation, Sci.Council Jpn.105-108 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N.Takasugi: "An Experiment of Cavitating Flow around a Finite Span Hydrofoil" J.Soc.Nav.Archi.Japan. Vol.172. 257-265 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Kishimoto: "A Numerical Analysis of Cavitating Flow around a Rotating Blade" J.Soc.Nav.Archi.Japan. Vol.173. 89-95 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N.Takasugi: "Study on Cavitating Flow around a Finite Span Hydrofoil" Proc.Cavitation and Multiphase Flow Forum, ASME. Vol.153. 177-182 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Kato: "Advances in Cavitating Flow Research" Science of Machine. Vol.45(10). 1027-1034 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Kishimoto: "A Numerical Analysis of Cavitating Flow around a Rotating Blade" J.Ship Research, SNAME. ( to appear).

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1995-03-27  

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