低比速度斜流ディフューザポンプにおける旋回失速挙動 A Behavior of the Diffuser Rotating Stall in a Low Specific Speed Mixed-Flow Pump

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The flow instability in a low specific speed mixed-flow pump, having a positive slope of head characteristic curve was investigated. After it was found from pressure measurement that a rotating stall in the vaned diffuser caused the instability, dynamic Particle Image Velocimetry (PIV) measurement and numerical simulation of Computational Fluid Dynamics (CFD) were carried out. Then, the rotating stall is simulated even in CFD and calculated patterns of instantaneous velocities agree well with measured ones by dynamic PIV. It is indicated that a periodical large scaled backflow, generated at the leading edge of the suction surface of the diffuser vane, causes the instability. Moreover, the growth of the strong vortex towards the leading edge of diffuser vane induces the strong backflow from the diffuser outlet to the inlet. The scale of one stall cell is covered over four-passages in thirteen vane-passages.

収録刊行物

  • ターボ機械 = Turbomachinery  

    ターボ機械 = Turbomachinery 35(2), 113-121, 2007-02-10 

    Turbomachinery Society of Japan

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各種コード

  • NII論文ID(NAID)
    10018722093
  • NII書誌ID(NCID)
    AN00004836
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    03858839
  • NDL 記事登録ID
    8663340
  • NDL 雑誌分類
    ZN15(科学技術--機械工学・工業--流体機械)
  • NDL 請求記号
    Z16-978
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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