Numerical Study of Sheet Cavitation Breakoff Phenomenon on a Cascade Hydrofoil

DOI PDF 被引用文献10件 オープンアクセス
  • Yuka Iga
    Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai Miyagi 980-8577, Japan
  • Motohiko Nohmi
    Ebara Research Co., Ltd., 11-1, Haneda Asahi-cho, Ohta-ku, Tokyo 144-8510, Japan
  • Akira Goto
    Ebara Research Co., Ltd., 4-2-1, Honfujisawa, Fujisawa 251-8502, Japan
  • Byeong Rog Shin
  • Toshiaki Ikohagi
    Institute of Fluid Science, Tohoku University, 2-1-1, Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan

書誌事項

公開日
2003-07-01
DOI
  • 10.1115/1.1596239
公開者
ASME International

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説明

<jats:p>Two-dimensional unsteady cavity flow through a cascade of hydrofoils is numerically calculated. Particular attention is focused on instability phenomena of a sheet cavity in the transient cavitation condition, and the mechanism of the breakoff phenomenon is examined. TVD-MacCormack’s scheme employing a locally homogeneous model of compressible gas-liquid two-phase medium is applied to analyze the cavity flows. The present method permits us to treat the entire cavitating/noncavitating unsteady flowfield. By analyzing the numerical results in detail, it becomes clear that there are at least two mechanisms in the breakoff phenomenon of the sheet cavity: one is that re-entrant jets play a dominant role in such a breakoff phenomenon, and the other is that pressure waves propagating inside the cavity bring about another type of breakoff phenomenon accompanying with cavity surface waves.</jats:p>

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