螺旋桨叶截面空化云仿真研究

Simulation of the cyclical process of cavitations cloud around propeller blade section

本文基于雷诺平均模拟方程(RANS方程),采用均相流空化模型和RNG k-ε湍流模型,对螺旋桨叶截面非定常空泡流动进行数值模拟。对局部层状空泡从初生、发展、断裂以及在下游高压区溃灭的周期性过程进行仿真,并将仿真结果与实验现象进行对比,对各个阶段的空化面积和空化程度进行数值统计分析。结果表明:在螺旋桨叶截面周期性云状空化流场中,90%以上高度空化区域和30%以下低度空化区域的面积变化显著,而其他空化程度的区域面积基本稳定。

RANS equations with RNG k-ε turbulent models and homogeneous multi-phase cavitation models are used to simulate the flow around propeller blade section. All the periodical process from initial generation,developing,rupture to collapse in the downstream is simulated. And then,after comparing the results with the phenomenon of the experiment,the statistics analysis of the cavitation degree and area in every stage is counted. The overall results suggest that in the periodic cavitation flow,the region which the degree of cavitation is more than 90 percents and less than 30 percents will occur dramatic change,and the other region remains stable.