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2007 Fiscal Year Final Research Report Summary

Study on Unstable Structure of Three-dimensional Vortices and its Oscillation induced by Cavitation Interaction

Research Project

Project/Area Number 17360081
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Fluid engineering
Research InstitutionKyushu University

Principal Investigator

FURUKAWA Akinori  Kyushu University, Faculty of Engineering, Professor (30112410)

Co-Investigator(Kenkyū-buntansha) WATANABE Satoshi  Kyushu University, Faculty of Engineering, Associate Professor (50304738)
ISHIZAKA Koichi  Kyushu University, Faculty of Engineering, Assistant Professor (30038070)
Project Period (FY) 2005 – 2007
KeywordsCavitation / Inducer / Cavitation surge / Inlet back flow / Flow control / Inlet obstacle plate / Multi-cameras observation system / Flow measurement
Research Abstract

Cavitation instabilities such as rotating cavitation and cavitation surge are one of the most important problems to be solved for realization of small-sized high-speed turbopumps. It is important to understand complex vortex structures in the internal flow and the unsteady cavity behavior, both of which play dominant roles in the cavitation instabilities. In the present study, we focused on the cavitation surge in helical inducers, in which the complex vortical flow structures including strong inlet back flow appear.
It is known that the cavitation surge is strongly associated with the inlet back flow and the installation of the obstacle plate upstream of inducer is effective for the suppression of the cavitation surge. In the present study, in FY2005, we measured the inlet flow of inducers with the different blade tip angle, and we investigated the effect of the inlet ring plate, which blocks the back flow near the tip region, on the inlet back flow as well as on the onset region of the cavitation surge. As a result, it was found that the angular momentum in the back flow is increased by installing the inlet plate, resulting in the increase of the static pressure near the tip region and the suppression of the cavitation surge. In FY2006, we carried out the numerical flow analysis of the inducer, which supported the previous experimental results. Next, we measured the inlet flow distortion due to the inlet baffle plate which blocks the back flow partially in the circumferential direction. And also we developed the multi-cameras observation system which enables us to observe the simultaneous cavity pattern from blade to blade. In FY2007, we clarified the suppression mechanism of the cavitaion surge by installing the above two kinds of obstacle plate through the flow measurement, the cavity observation and the numerical simulation.

  • Research Products

    (14 results)

All 2008 2007 2006 2005

All Journal Article (4 results) (of which Peer Reviewed: 2 results) Presentation (10 results)

  • [Journal Article] Suppression Effect of Upstream Installed Ring-Shaped Obstacle Plate on Cavitation Surein Pump Inducers2008

    • Author(s)
      J. -H. Kim
    • Journal Title

      Journal of Fluid Science and Technology 3

      Pages: 1-10

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] Suppression Effect of Upstream Installed Ring-shaped Obstacle Plate on Cavitation Surge in Pump Inducers.2008

    • Author(s)
      J.-H., Kim
    • Journal Title

      Journal of Fluids Science and Technology, Refereed Vol. 3, No. 1

      Pages: 1-10

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] ポンプインデューサの入口上流に付設した軸対称障害板の脈動キャビテーション抑制効果2006

    • Author(s)
      金 峻琥
    • Journal Title

      日本機械学会論文集(B編) 72-724

      Pages: 3043-3049

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] Suppression Effect of Cavitation Surge of Pump Inducer by Installing Ring-Shaped Obstacle Plate Upstream of Inducer.2006

    • Author(s)
      J.-H., Kim
    • Journal Title

      Transactions of JSME, Series B, Refereed Vol. 72, No. 724

      Pages: 3043-3049

    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] Rotating Behavior Observation of Cavitation in Inducer with Suction Axi-asvmmetrical Plate2007

    • Author(s)
      J. -H. Kim
    • Organizer
      9th Asian International Conference on Fluid Machinery
    • Place of Presentation
      Jeju,Korea
    • Year and Date
      20071000
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] Rotating Behavior Observation of Cavitation in Inducer with Suction Axi-asymmetrical Plate.2007

    • Author(s)
      J.-H., Kim
    • Organizer
      9th Asian International Conference on Fluid Machinery
    • Place of Presentation
      Jeju, Korea.
    • Year and Date
      20071000
    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] Numerica/Experimental Investigations on Inlet Back Flow in a HeHcal Inducer in Partial Flow Conditions2007

    • Author(s)
      S. Watanabe
    • Organizer
      5th Joint ASIME/JSWE Fluids Engineering Conference
    • Place of Presentation
      San Diego,USA
    • Year and Date
      20070800
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] Numerical/Experimental Investigations on Inlet Back Flow in a Helical Inducer in Partial Flow Conditions.2007

    • Author(s)
      S., Watanabe
    • Organizer
      5th Joint ASME/JSME Fluids Engineering Conference
    • Place of Presentation
      San Diego, USA.
    • Year and Date
      20070800
    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] Suppression of Cavitation Surge of Pump Inducer by Inserting Ring-shaped Inlet Plate2006

    • Author(s)
      J. -H. Kim
    • Organizer
      6th International Symposium on Cavitation
    • Place of Presentation
      Wageningen,Netherland
    • Year and Date
      20060900
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] Suppression of Cavitation Surge of Pump Inducer by Inserting Ring-shaped Inlet Plate.2006

    • Author(s)
      J.-H., Kim
    • Organizer
      6th International Symposium on Cavitation
    • Place of Presentation
      Wageningen, Netherland.
    • Year and Date
      20060900
    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] Tentative Study on Real-time Data Processing for Advance Detection of Cavitation Surge in Pump Inducer2005

    • Author(s)
      T. Atono
    • Organizer
      8th Asian International Conference on Fluid Machinery
    • Place of Presentation
      Yichang,China
    • Year and Date
      20051000
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] Tentative Study on Real-time Data Processing for Advance Detection of Cavitation Surge in Pump Inducer2005

    • Author(s)
      T., Atono
    • Organizer
      8th Asian International Conference on Fluid Machinery
    • Place of Presentation
      Yichang, China.
    • Year and Date
      20051000
    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] Suppression of Cavitation Surge of Inducer by Inserting Axi-asymmethc Obstacle Plate2005

    • Author(s)
      J. -H. Kim
    • Organizer
      6th KSME-JSME Thermal andF luids Engineering Conference
    • Place of Presentation
      Jeju,Korea
    • Year and Date
      20050300
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] Suppression of Cavitation Surge of Inducer by Inserting Axi-asymmetric Obstacle Plate2005

    • Author(s)
      J.-H., Kim
    • Organizer
      6th KSME-JSME Thermal and Fluids Engineering Conference
    • Place of Presentation
      Jeju, Korea.
    • Year and Date
      20050300
    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2010-02-04  

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