均流中PPTC螺旋桨梢涡空泡数值预报

文章采用Sauer空化模型,研究了网格类型和湍流模型对均流中螺旋桨梢涡空泡数值模拟的影响,研究表明,现有的空泡模型适合于螺旋桨梢涡空泡的数值模拟,其中梢涡空泡区域网格密度是关键,文中提出了一种合适的梢涡空泡区域网格加密方法.对PPTC螺旋桨全湿流和梢涡空泡进行了数值预报,螺旋桨梢涡空泡形态与试验结果进行了对比,并应用涡判据"Q准则"和"λ2准则"分析了梢涡与梢涡空泡的流动特征.全湿流中梢涡区域的涡量随周向的分布呈现单峰特性,最小涡量在涡心处,而空泡流中梢涡空泡区域的涡量随周向的分布呈现双峰特性,最小涡量不在涡心处.

Numerical Predictions of the PPTC Propeller Tip Vortex Cavitation in Uniform Flow

Using Sauer's cavitation model, the effects of grid type and turbulence model on propeller tip vortex cavitation simulation results are researched. It shows that the Sauer 's cavitation model is suitable for the propeller tip vortex cavitation simulation, and the key point is the grid density at the tip vortex cavitation region. A local grid refinement method is proposed. The simulation of PPTC propeller wetted flow and tip vortex cavitation flow is implemented, and the propeller tip vortex cav-itation shape is compared with the corresponding experiments results. In order to analyse the main features of tip vortex and tip vortex cavitation, 'Q-Criterion' and 'λ2-Criterion' are used. The vorticity distribution in the tip vortex region of wetted flow presents single hump shape, and the mini-mum value is at the tip vortex core. The vorticity distribution in the tip vortex cavity region of cavi-tation flow presents double humps shape, and the minimum value is not at the tip vortex cavitation core.