三维水翼片空泡尺度效应研究

针对三维水翼的片空泡尺度效应问题，建立LES湍流模型对三维水翼的片空泡生成情况进行计算研究。模拟了片空泡在一个周期内的生成和脱落过程，空泡计算结果与试验做了详细对比，发现LES湍流模型的计算结果与实验结果吻合较好，能较为完整的显示片空泡的脱落过程。研究了来流速度和模型尺度的变化对片空泡产生的影响，发现速度对初始片空泡数基本无影响，而模型尺度对片空泡的形成和发展有影响，但该影响并不大。在此基础上推导了新的初始片空泡数的尺度效应公式。

Scaling effects of hydrofoil sheet cavitation

LES model were conducted in the analysis of hydrofoil sheet cavitation scaling effects. The shedding proced-ure of sheet cavitation in one circle is simulated. The CFD results is compared with experiment in detail and it is found that LES results which can clearly show the whole shedding procedure of sheet cavitation is agreed well with experiment. The in-fluences of velocity and model size to sheet cavitation are studied, it is found the velocity can barely affect the sheet cavita-tion inception number and model size has some effect on sheet cavitation, but the effect is not big. Based on that, new scal-ing law of sheet cavitation inception number is deduced.