In order to evaluate the influence of driving pressure on the accuracy of erosion prediction,the density-corrected SST turbulence model and the Sauer cavitation model are used to simulate the transient cavitation around the twisted hydrofoil.The numerical simulation results are verified by comparing the cavitation shedding frequency and the transient characteristics of the cavitation in the experiment.In addition,the wall erosion load is predicted by defining the erosion energy density in the flow field and by mapping the erosion energy to the wall.According to the above investigation,it is found that using the time-averaged pressure field as the driving pressure can obtain more reasonable and more agreeable erosion results.Meanwhile,it is found that the main eroded area on the middle of the foil is related to the collapse of the sheet cavity trailing edge and the collapse of the cloud cavity in the downstream development process,while the scattered pitting area in the middle of the foil trailing edge is mainly related to the U-shape vortex collapse.
关键词
空化空蚀/瞬态空化/空蚀预测/壁面空蚀强度/时均压力场
Key words
Cavitation erosion/Transient cavitation/Erosion prediction/Wall erosion load/Time-averaged pressure field
维普
万方数据