0434 Lift and drag fluctuations of cavitating Clark Y-11.7% hydrofoil

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. It is confirmed that, at the angle of attack of 8.0 degree, as the cavitation number is decreased, the lift estimated from time-averaged pressure distributions around the hydrofoil slightly increases from that in the non-cavitating condition just before the sudden breakdown, which has been reported by the past literatures. This time, lift and drag forces are directly measured in various cavitating numbers and angles of attack.