Dynamic Characteristics of the Radial Clearance Flow Between Axially Oscillating Rotational Disk and Stationary Disk

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  • 回転しながら軸方向に振動する円盤と静止円盤の間の半径方向隙間流れの動特性
  • カイテンシナガラ ジク ホウコウ ニ シンドウスル エンバン ト セイシ エンバン ノ アイダ ノ ハンケイ ホウコウ スキマ ナガレ ノ ドウトクセイ

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Abstract

Dynamic characteristics of the clearance flow between a rotating and axially oscillating disk and a static disk were examined by experiments and numerical simulations based on a bulk flow model. In the case without pressure fluctuations at the inlet and outlet of the clearance, parallel and contracting flow paths had an effect of stabilizing the axial oscillation of the rotating disk. The enlarged flow path had an effect of destabilizing the axial oscillation due to the negative damping and stiffness for outward and inward flows, respectively. It was shown that the fluid force can be decomposed into the component caused by the inlet or outlet pressure fluctuation without the axial oscillation and that due to the axial oscillation without the inlet or outlet pressure fluctuation. A method to predict the stiffness and damping coefficients is proposed for general cases when the clearance is combined with an arbitrary flow system.

Journal

  • Turbomachinery

    Turbomachinery 37 (1), 52-62, 2009

    Turbomachinery Society of Japan

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