1444 ピッチング運動翼における渦キャビテーション放出のロックイン現象

概要

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It is well known that a cavitation hydrofoil falls into the self-induced oscillation under some oscillation frequencies and cavitation numbers. Especially, the violent cavity breakdown occurs when the cavity length reaches to the chord length. It causes the unsteady and nonlinear fluid forces on the hydrofoil. This nonlinear phenomenon is not yet clarified when the cavity breakdown frequency locks into the pitching frequency of the cavitation hydrofoil. In this lick-in phase, the fluctuating lift coefficient was mainly clarified by load cell measurement with cavity length and reduced frequency as parameters. Moreover, by using particle and bubble image processing method with PIV, the equivalent void fraction, the velocity vector and the vorticity maps including the inner cavity were visualized qualitatively and quantitatively.
一般社団法人日本機械学会の論文
2003-08-05