关键词: 梢隙涡, 湍流模型, 涡轨迹, 空泡

Abstract: The simulation of the tip clearance vortex cavitation is a challenging project due to the difficulty of defining the mass source item. The numerical simulation is conducted by using the Reynolds-averaged Navier-stokes (RANS) method with the Schnerr and Sauer cavitation model, in order to accurately predict the tip clearance vortex between the hydrofoil and the wall. For no cavitating flows, the results with the different turbulence models show the high accuracy of the SST k-ω model. For cavitating flows, the results show that the cavitation will change the trajectory of the vortex core, making it closer to the wall and the suction side. The current study shows that the tip clearance vortex can be predicted by the observation of the tip clearance vortex cavitation which may be one of the important factors inducing cavitation erosion.

Key words: Tip clearance vortex, turbulence model, vortex trajectory, cavitation