Suppression of Cavitation Instabilities by Applying Circumferential Grooveand Study on the Cause of High-Frequency Pressure Fluctuation in an Inducer

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Other Title
  • インデューサに生じるキャビテーション不安定現象の周方向溝による抑制と高周波数圧力変動の原因に関する考察
  • インデューサ ニ ショウジル キャビテーション フアンテイ ゲンショウ ノ シュウ ホウコウ コウ ニ ヨル ヨクセイ ト コウシュウハスウ アツリョク ヘンドウ ノ ゲンイン ニ カンスル コウサツ

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Abstract

The purpose of the present research is to suppress cavitation instabilities by using a circumferential groove. The circumferential groove was designed based on CFD so that the tip leakage vortex is trapped by the groove and does not interact with the next blade. Experimental results show that the groove can suppress rotating cavitation, asymmetric cavitation and cavitation surge. However, weak instabilities with higher frequency occurred in a wide range of cavitation number. From the analysis of pressure pattern similar to that for rotor-stator interaction, it was found that the higher frequency components are caused by the interaction of backflow vortices with the inducer blades.

Journal

  • Turbomachinery

    Turbomachinery 39 (2), 65-78, 2011

    Turbomachinery Society of Japan

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