キャビテーション発生下のClark-Y 11.7％翼の揚抗力特性

抄録

Cavitating flow around a Clark Y 11.7% hydrofoil in a water tunnel is studied experimentally in order to understand the cavitation performance of hydrofoil and its relation to cavitation behaviors. Lift and drag forces are directly measured in various cavitating conditions simultaneously with high-speed video observations and pressure fluctuation measurements. It is confirmed that, the lift force slightly increases with some amount of cavitation and then decreases as the cavitation number is decreased. The cavity behavior is rather stable at the cavitation number with the maximum lift force, and the cavitation instabilities are observed during the decrease of the lift force. At the angle of attack of α=2.0 degree, the increase of the lift is not observed, and the lift force decreases with the occurrence of one of cavitation instabilities.