Prediction of cavity volumes on rotating blades and scale effects

Object and purpose of research. Pressure pulsations induced by cavitating blades substantially contribute to flowinduced loads amplify structural vibration. These depend on oscillation the volume cavities over blades. Prediction them usually involves model tests there are three kinds scale effects influencing cavity volumes. The first one is associated with non-uniform inflows. second combined influence blade boundary layer surface tension surface. third buoyancy. Materials methods. Because complexity flows, a qualitative analysis similar unsteady flows around 3D hydrofoils useful. This paper presents such an for hydrofoil sections copied from marine propeller blade. inflows correspond wakes ship her model. Computations carried out using viscous-inviscid interaction. Main results. explanation observed trends obtained due this analysis. In particular, role pressure side cavitation in full conditions pointed out. Conclusion. difference results substantial section angles attack at same loading. Therefore, suction more extensive, whereas may not appear, though it exists full-scale effect has been previous considerations.