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

Study on Vibration Instability Induced by Cavitating Flow in Densified Subcooled Cryogenic Fluids

Research Project

Project/Area Number 18560177
Research Category

Grant-in-Aid for Scientific Research (C)

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

Principal Investigator

OIKE Mamoru  Ishinomaki Senshu University, Faculty of Science and Engineering, Professor (70292282)

Co-Investigator(Kenkyū-buntansha) OHIRA Katsuhide  Tokoku University, Institute of Fluid Science, Professor (30375117)
Project Period (FY) 2006 – 2007
Project Status Completed (Fiscal Year 2007)
Budget Amount *help
¥3,840,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥240,000)
Fiscal Year 2007: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2006: ¥2,800,000 (Direct Cost: ¥2,800,000)
KeywordsFluid Engineering / Properties at Low Temperature / Cavitating Flow / Vibration Instability
Research Abstract

Experiments on cavitating flow in a converging-diverging nozzle were conducted at several temperatures (70-77 K) in order to clarify the temperature dependence of cavitation characteristics in subcooled cryogenic fluids (liquid nitrogen). Cavitation behavior was found to change as the temperature decreased, and various pressure fluctuations were observed. Cavitation was generated continuously above 76 K, but not maintained stably below 76 K. Moreover, strong pressure fluctuations occurred upstream of the nozzle between 73 K and 76 K. A large vibration of the piping system in the experimental apparatus also occurred with the pressure fluctuation below 76 K, whereas a similar vibration was rarely observed above 76 K. These behaviors of cavitating flows are caused by choking at the nozzle throat due to a reduction in the speed of sound in bubbly flow. In particular, the strong pressure fluctuations are considered to be induced by the water hammer phenomenon resulting from the fluctuation of the flow velocity at the nozzle throat. In addition, further experiments on cavitating flow were conducted, in which liquid nitrogen dissolved many bubble nuclei, resulting in the reduction of the fluctuations of the flow velocity before and after the occurrence of cavitation. This result showed that the amplitude of pressure fluctuations was reduced as the fluctuation of the flow velocity decreased. From this result, it was concluded that the pressure fluctuations with cavitation in subcooled liquid nitrogen are affected by a reduction in the speed of sound in bubbly flows. Furthermore, the acceleration fluctuations of the piping system in the radius direction was found to be correlated strongly with the pressure fluctuations induced by cavitating flow in subcooed liquid nitrogen.

Report

(3 results)
  • 2007 Annual Research Report   Final Research Report Summary
  • 2006 Annual Research Report
  • Research Products

    (11 results)

All 2008 2007 2006

All Journal Article (3 results) (of which Peer Reviewed: 2 results) Presentation (8 results)

  • [Journal Article] Cavitation Instability in Subcooled Liquid Nitrogen Nozzle Flows2008

    • Author(s)
      新井 山一樹
    • Journal Title

      JSME Journal of Fluid Science and Technology Vol.3,No.4(印刷中)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Cavitation Instability in Subcooled Liquid Nitrogen Nozzle Flows2008

    • Author(s)
      H. Niiyama
    • Journal Title

      JSME Journal of Fluid Science and Technology Vol.3 No.4(in printing)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Cavitation Instability in Subcooled Liquid Nitrogen Nozzle Flows2008

    • Author(s)
      新井山 一樹
    • Journal Title

      Journal of Fluid Science and Technology Vol.3,No.4(6月発行)

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Presentation] サブクール液体窒素のキャビテーション不安定性と圧力変動特性2008

    • Author(s)
      新井 山一樹
    • Organizer
      日本航空宇宙学会北部支部2008年講演会
    • Place of Presentation
      北海道札幌市
    • Year and Date
      2008-03-10
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Cavitation Instability and Pressure Fluctuation Characteristics in Subcooled Liquid Nitrogen2008

    • Author(s)
      K. Niiyama
    • Organizer
      Northern Section of the JSASS Annual Meeting 2008
    • Place of Presentation
      Sapporo
    • Year and Date
      2008-03-10
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] サブクール液体窒素のキャビテーション不安定性と圧力変動特性2008

    • Author(s)
      新井山 一樹
    • Organizer
      航空宇宙学会北部支部2008年講演会
    • Place of Presentation
      北海道札幌市
    • Year and Date
      2008-03-10
    • Related Report
      2007 Annual Research Report
  • [Presentation] Cavitation Instability in Subcooled Liquid Nitrogen Nozzle Flows2007

    • Author(s)
      新井 山一樹
    • Organizer
      7th Int.Symposium on Advanced Fluid Information
    • Place of Presentation
      宮城県仙台市
    • Year and Date
      2007-12-14
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Cavitation Instability in Subcooled Liquid Nitrogen Nozzle Flows2007

    • Author(s)
      K. Niiyama
    • Organizer
      7th International Symposium on Advanced Fluid Information(AFI.2007)
    • Place of Presentation
      Sendai
    • Year and Date
      2007-12-14
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Cavitation Instability in Subcooled Liquid Nitrogen Nozzle Flows2007

    • Author(s)
      新井山 一樹
    • Organizer
      7^<th> Int.Symposium on Advanced Fluid Information
    • Place of Presentation
      宮城県仙台市
    • Related Report
      2007 Annual Research Report
  • [Presentation] 過冷却液体窒素のキャビテーション流れにおける圧力振動特性2006

    • Author(s)
      新井 山一樹
    • Organizer
      日本混相流学会年会2006
    • Place of Presentation
      石川県金沢市
    • Year and Date
      2006-08-05
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Pressure Oscillation Characteristics in Cavitating Flow of Sub-cooled Liquid Nitrogen2006

    • Author(s)
      K. Niiyama
    • Organizer
      JSMF Annual Meeting 2006
    • Place of Presentation
      Kanazawa
    • Year and Date
      2006-08-05
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary

URL: 

Published: 2006-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi