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EROSION MECHANISM OF IMPULSIVE VORITEX CAVITATION BUBBLES AND VORTEX STRUCTURE OF GAS-LIQUID FLOW

Research Project

Project/Area Number 09650208
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Fluid engineering
Research InstitutionKANAZAWA INSTITUTE OF TECHNOLOGY

Principal Investigator

SATO Keiichi  KANAZAWA INSTITUTE OF TECHNOLOGY, DEPARTMENT OF ENGINEERING, PROFESSOR, 工学部, 教授 (50113030)

Co-Investigator(Kenkyū-buntansha) SATO Yasuhiro  KANAZAWA INSTITUTE OF TECHNOLOGY, DEPARTMENT OF ENGINEERING, ASSISTANT, 工学部, 助手 (00319039)
SHINTANI Kazuhiro  KANAZAWA INSTITUTE OF TECHNOLOGY, DEPARTMENT OF ENGINEERING, PROFESSOR, 工学部, 教授 (80139758)
Project Period (FY) 1997 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 1999: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1998: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1997: ¥1,300,000 (Direct Cost: ¥1,300,000)
KeywordsCAVITATION / EROSION / VORTEX / TWO-PHASE FLOW / BUBBLE / UNSTEADYNESS / IMPULSIVE FORCE / HIGH SPEED LIQUID FLOW / 発生制御
Research Abstract

Vortex cavitation was investigated because of its possibility to cause high impulsive force compared with other types. It was tried to make clear the appearance of impact generation and the mechanism of impact. Especially, unsteady motions of vortex cavitation were examined as well as the role of gas-liquid two-phase state. The main results are as follows.
First, it is found that an impulsive collapse of cavitation bubbles is caused by unsteady motion with the entrainment flow due to a pair of vortex cavitation in the separated shear layer behind a triangular or a circular cylinder. In addition it is experimentally proved that the axial-collapse pattern can cause erosion pits on the wall material. This collapse pattern which has a rotating axis perpendicular to the wall has been known as the strongest one of other patterns of vortex cavitations. It is also found that one attack generated by the collapse of vortex cavitation consists of a cluster of bubbles in gas-liquid two-phase state because the number of pits is two or up. A soft coated test-plate for erosion was used as a new one to catch directly the collapsing behavior of bubbles. Through experiments each erosion pit was investigated to find out the cluster-like behavior of vortex cavities. As the shedding type of vortex cavities make an important role in an impulsive character the cavitation characteristics about an axisymmetrical inside-flow were examined which had not been clear. Thus some results were obtained as follows ; the shedding cavities are also observed in this flow-type and closely connected to high impulsive force, a re-entrant motion occurs in the separation bubble of two-phase state and closely connected to the bubble shedding, and shedding two-phase vortices shows a ring-like appearance. Furthermore existing researching results were summarized under the present works.

Report

(4 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • 1997 Annual Research Report
  • Research Products

    (24 results)

All Other

All Publications (24 results)

  • [Publications] 佐藤恵一: "キャビテーション壊食に関連する渦キャビティ圧壊挙動の観察"日本機械学会論文集. 63. 3815-3821 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 佐藤恵一: "渦キャビテーション気泡崩壊挙動と壊食との同時計測"日本機械学会論文集. 64. 67-72 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 佐藤恵一: "流路壁面近傍でのはく離渦キャビテーション気泡の分裂・崩壊過程"日本機械学会論文集. 64. 73-80 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 佐藤恵一: "A New Method of Cavitation Erosion Measurement Using A Plate Deposited by Vacuum Evaporation"Modern Techniques and Measurements in Fluid Flows. 325-330 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 佐藤恵一: "Bubble Collapsing Behavior and Damage Pits of Separated Vortex Cavitaion"Proc. Third International Symposium on Cavitation. 157-162 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 佐藤恵一: "Impulsive Behavior of Cavitation Bubbles in a Circular-Cylindrical Orifice Flow"ASME-Paper FEDSM2000-11023. (発表予定). (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 佐藤恵一: "あわの発生メカニズムと制御およびトラブル対策"技術情報協会. 218 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Sato,K.: "Bubble Collapsing Behavior of Vortex Cavitation Relative to Erosion"Trans.JSME,Ser.B. 63-616. 3815-3821 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Sato,K.: "Simultaneous Measurements of Collapsing Behavior and Erosion Pits for Vortex Cavitation Bubble"Trans.JSME,Ser.B. 64-622. 62-72 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Sato,K.: "Bubble Collapsing Process of Separated Vortex Cavitation near Solid Wall"Trans.JSME,Ser.B. 64-622. 73-80 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Sato,K.: "A New Method of Cavitation Erosion Measurement Using A Plate Deposited by Vacuum Evaporation"Modern Techniques and Measurements in Fluid Flows. 325-330 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Sato,K.: "Bubble Collapsing Behavior and Damage Pits of Separated Vortex Cavitation"Proceedings of Third International Symposium on Cavitation. 157-162 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] stack.: "Impulsive Behavior of Cavitation Bubbles in a Circular-Cylindrical Orifice Flow"ASME-Paper FEDSM2000-11023. to be published. (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 佐藤恵一: "軸対称剥離渦流れにおける衝撃性気泡の挙動"日本学術会議弟10回キャビテーションに関するシンポジウム. 145-148 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 佐藤恵一: "Impulsive Behavior of Cavitation Bubbles in a Cirucular Cylindrical Orifice Flow"ASME-Paper FEDSM00-11023. (発表予定). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] 佐藤恵一: "渦キャビテーション気泡崩壊挙動と壊食との同時計測" 日本機械学会論文集. 64・622. 1683-1688 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 佐藤恵一: "流路壁面近傍でのはく離渦キャビテーション気泡の分裂・崩壊過程" 日本機械学会論文集. 64・622. 1689-1696 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 佐藤恵一: "渦キャビテーションによる壊食機構に関する-検討" 日本機械学会講演論文集. 98・15. 325-326 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 佐藤恵一: "剥離渦キャビテーション気泡の崩壊・衝撃様相" 日本機械学会講演論文集. 98・3. 217-218 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 佐藤恵一: "キャビテーション壊食に関連する渦キャビティ圧壊挙動の観察" 日本機械学会論文集. 63・616. 3815-3821 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 佐藤恵一: "High-speed-video observations of vortex cavitation behind a cylindrical bluff body" Proceedings of JSME ICFE'97. 1. 251-256 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 佐藤恵一: "Bubble collapsing behavior and damage pits of separated vortex cavitation" Proceedings of Third Int.Symp.on Cavitation. 発表予定 (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] 佐藤恵一: "剥離渦キャビテーションの崩壊・衝撃・壊食研究への試み" 第9回キャビテーションに関するシンポジウム. 7-10 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 佐藤恵一: "円柱後流での剥離渦キャビテーション気泡の分裂・崩壊挙動" 日本機械学会講演論文集. 977・1. 233-234 (1997)

    • Related Report
      1997 Annual Research Report

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

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