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

Verification of Unstable Flow Mechanism due to Inducer Tip Leakage Vortex in a Centrifugal Blower

Research Project

Project/Area Number 16560152
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Fluid engineering
Research InstitutionNAGASAKI UNIVERSITY

Principal Investigator

ISHIDA Masahiro  Nagasaki University, Graduate School of Science & Technology, Professor, 大学院生産科学研究科, 教授 (60039683)

Co-Investigator(Kenkyū-buntansha) SAKAGUCHI Daisaku  Nagasaki University, Graduate School of Science & Technology, Research Associate, 大学院生産科学研究科, 助手 (70244035)
Project Period (FY) 2004 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 2005: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2004: ¥2,400,000 (Direct Cost: ¥2,400,000)
KeywordsCentrifugal Blower / Unstable Flow / CFD Analysis / Inducer Stall / Inlet Recirculation / Pre-whirl Control / Inlet Guide Vane / Surge Margin / インデゥーサ失速 / ディフューザ失速 / 予旋回
Research Abstract

In order to clarify the mechanism of unstable flow inception in a high specific speed type open shrouded centrifugal impeller with inducer, 3-D turbulent flow simulations and experimental works as well were performed and the following concluding remarks are obtained. (1)At first, it is found that the steady flow simulation was very helpful for understanding unsteady stall phenomena. (2)The incipient unstable flow occurs due to a rolling-up vortex flow resulting from an interaction between the tip leakage flow and the reverse flow accumulated at the pressure side immediately downstream of the inducer tip throat. (3)By forming the inlet recirculation flow, the tip leakage vortex is sucked into the suction ring groove, and the flow incidence is decreased simultaneously. (4)The unstable flow range of the test blower was reduced by about 45% without deteriorating the impeller characteristics by implementing both the ring groove arrangement and the narrowed diffuser width. (5)By the optimized configuration of the front and rear ring grooves, the unstable flow range of the test impeller was reduced by about 50% without deterioration of the impeller characteristic even at the 125% flow rate.
In order to obtain a wider operating range, guide vanes were installed circumferentially in the annular bypass of the ring groove arrangement, and the setting angle of the guide vane was changed. (6)The fundamental concept for surge suppression is to achieve the flow incidence less than but close to the critical one. (7)A higher pressure rise in the inducer is obtained at the flow incidence close to the critical one by suppressing the pre-whirl which is induced by the recirculation flow. (8)The unstable flow rate range of the tested impeller was reduced by about 53% almost without deterioration of the impeller efficiency in the whole flow rate range.

Report

(3 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • Research Products

    (25 results)

All 2006 2005 2004

All Journal Article (25 results)

  • [Journal Article] Effect of Pre-whirl on Unstable Flow Suppression in a Centrifugal Impeller with Ring Groove Arrangement2006

    • Author(s)
      Ishida, Masahiro
    • Journal Title

      Proceedings of ASME TURBO EXPO 2006 Paper No.GT2006-90400

      Pages: 1-10

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Effect of Pre-whirl on Unstable Flow Suppression in a Centrifugal Impeller with Ring Groove Arrangement2006

    • Author(s)
      Masahiro Ishida, Daisaku Sakaguchi, Hironobu Ueki
    • Journal Title

      Proc.of GT2006 ASME TURBO EXPO 2006 Paper No.GT2006-90400(CD-ROM)

      Pages: 1-9

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Effect of Pre-whirl on Unstable Flow Suppression in a Centrifugal Impeller with Ring Groove Arrangement2006

    • Author(s)
      Ishida, Masahiro
    • Journal Title

      Proceedings of ASME TURBO EXPO 2006 Paper No. GT 2006-90400(連載決定)

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Suppression of Unstable Flow at Small Flow Rates in a Centrifugal Blower by Controlling Tip Leakage Vortex and Reverse Flow2005

    • Author(s)
      Ishida, Masahiro
    • Journal Title

      Trans.ASME,Journal of Turbomachienry(Paper No.2004-GT-53400) Vol.127,No.1

      Pages: 76-83

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] 遠心送風機の低流量域不安定流動の抑制(入口循環流の影響解析)2005

    • Author(s)
      服部慎一郎
    • Journal Title

      日本機械学会九州支部第58期総会講演会講演論文集 No.058-1

      Pages: 333-334

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Optimization of Inlet Ring Groove Arrangement for Suppression of Unstable Flow in a Centrifugal Impeller2005

    • Author(s)
      Ishida, Masahiro
    • Journal Title

      Proceedings of ASME TRUBO EXPO 2005 Paper No.GT2005-68675

      Pages: 1-10

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] 遠心送風機の低流量域不安定流動の抑制(ガイドベーン付き入口環状溝の効果)2005

    • Author(s)
      坂口大作
    • Journal Title

      日本機械学会2005年度年次大会講演論文集 No.05-1,Vol.7

      Pages: 215-216

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Annual Research Report 2005 Final Research Report Summary
  • [Journal Article] Effect of Pre-Whirl on Unstable Flow Inception in a Centrifugal Impeller2005

    • Author(s)
      Sakaguchi, Daisaku
    • Journal Title

      Proceedings of the 8^<th> Asian International Fluid Machinery Conference(8^<th> AICFM) Vol.1

      Pages: 773-783

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] 遠心送風機の低流量域不安定流動の抑制(入口循環流に及ぼすガイドベーン設定角の影響)2005

    • Author(s)
      坂口大作
    • Journal Title

      日本機械学会第83期流体工学部門講演会講演概要・論文集 No.05-32,PaperNo.1510

      Pages: 1-4

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Suppression of Unstable Flow at Small Flow Rates in a Centrifugal Blower by Controlling Tip Leakage Flow and Reverse Flow2005

    • Author(s)
      Masahiro Ishida, Taufan Surana, Hironobu Ueki, Daisaku Sakaguchi
    • Journal Title

      Trans.ASME, Journal of Turbomachinery, (Paper No.2004-GT-53400), Vol.127, No.1

      Pages: 76-83

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Suppression of Unstable Flow at Small Flow Rates in a Centrifugal Blower (Analysis of Inlet Recirculation Flow Effect)2005

    • Author(s)
      Shinichiro Hattori, Takayuki Matsumura, Daisaku Sakaguchi, Hironobu Ueki, Masahiro Ishida
    • Journal Title

      Proc.of the JSME Congress-Kyushu, No.058-1

      Pages: 333-334

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Optimization of Inlet Ring Groove Arrangement for Suppression of Unstable Flow in a Centrifugal Impeller2005

    • Author(s)
      Masahiro Ishida, Daisaku Sakaguchi, Hironobu Ueki
    • Journal Title

      Proc.of GT2005 ASME TURBO EXPO 2005, Paper No.GT2005-68675

      Pages: 1-10

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Suppression of Unstable Flow at Small Flow Rates in a Centrifugal Blower (Effect of Inlet Ring Groove Arrangement with Guide Vane)2005

    • Author(s)
      Daisaku Sakaguchi, Masahiro Ishida, Hironobu Ueki
    • Journal Title

      Proc.of the Mechanical Engineering Congress in Japan 2005, No.05-1, Vol.7

      Pages: 215-216

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Effect of Pre-whirl on Unstable Flow in a Centrifugal Impeller2005

    • Author(s)
      Daisaku Sakaguchi, Masahiro Ishida, Hironobu Ueki
    • Journal Title

      Proc.of the 8th Asian International Conference on Fluid Machinery, Vol.1

      Pages: 773-783

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Suppression of Unstable Flow at Small Flow Rates in a Centrifugal Blower (Effect of Guide Vane Setting Angle on Inlet Recirculation Flow)2005

    • Author(s)
      Daisaku Sakaguchi, Shinichiro Hattori, Masahiro Ishida, Hironobu Ueki
    • Journal Title

      Proc.of the JSME Fluids Engineering Conference 2005 No.05-32, Paper No.1510(CD-ROM)

      Pages: 1-4

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Optimization of Inlet Ring Groove Arrangement for Suppression of Unstable Flow in a Centrifugal Impeller2005

    • Author(s)
      Ishida, Masahiro
    • Journal Title

      Proceedings of ASME TURBO EXPO 2005 Paper No. GT 2005-68675

      Pages: 1-10

    • Related Report
      2005 Annual Research Report
  • [Journal Article] 遠心送風機の低流量域不安定流動の抑制(入口循環流に及ぼすガイドベーン設定角の影響)2005

    • Author(s)
      坂口大作
    • Journal Title

      日本機械学会流体工学部門講演会講演論文集 No.05-32,Paper No.1510

      Pages: 1-4

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Effect of Pre-Whirl on Unstable Flow Inception in a Centrifugal Impeller2005

    • Author(s)
      Sakaguchi, Daisaku
    • Journal Title

      Proceedings of the 8^<th> Asian International Fluid Machinery Conference (8^<th> AICFM) Vol.1

      Pages: 773-783

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Suppression of Unstable Flow at Small Flow Rates in a Centrifugal Blower by Controlline Tin Leakage Vortex and Reverse Flow2005

    • Author(s)
      Ishida, Masahiro
    • Journal Title

      Trans. ASME, Journal of Turbomachienry, (Paper No.GT2004-53400) Vol.127, No.1

      Pages: 76-83

    • Related Report
      2004 Annual Research Report
  • [Journal Article] 遠心送風機の低流量域不安定流動の抑制(入口循環流の影響解析)2005

    • Author(s)
      服部慎一郎
    • Journal Title

      日本機会学会九州支部第58期総会講演会講演論文集 No.058-1

      Pages: 333-334

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Optimization of inlet Ring Groove Arrangement for Suppression of Unstable Flow in a Centrifugal Impeller2005

    • Author(s)
      Ishida, Masahiro
    • Journal Title

      Proceedings of GT2005,ASME TURBO EXPO 2005 Paper No. GT 2005-68675(掲載予定)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] 遠心送風機不安定流動抑制のための入口環状溝の最適形状2004

    • Author(s)
      石田正弘
    • Journal Title

      日本機械学会第82期流体工学部門講演会講演概要・論文集 No.04-25,Paper No.107(CD-ROM)

      Pages: 1-4

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Optimum Configuration of Inlet Ring Groove for Suppression of Unstable Flow in a Centrifugal Blower2004

    • Author(s)
      Masahiro Ishida, Daisaku Sakaguchi, Hironobu Ueki, Taufan Surana
    • Journal Title

      Proc.of the JSME Fluids Engineering Conference 2004 No.04-25, Paper No.107(CD-ROM)

      Pages: 1-4

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] 遠心送風機不安定流動抑制のための入口環状溝の最適形状2004

    • Author(s)
      石田正弘
    • Journal Title

      日本機会学会流体工学部門講演会講演論文集 No.04-25

      Pages: 1-4

    • Related Report
      2004 Annual Research Report
  • [Journal Article] 遠心送風機のディフューザ失速に及ぼす通路幅の影響解析2004

    • Author(s)
      石田正弘
    • Journal Title

      日本機会学会九州支部第57期総会講演会講演論文集 No.048-1

      Pages: 257-258

    • Related Report
      2004 Annual Research Report

URL: 

Published: 2004-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi