扭曲水翼空化数值模拟与动态特性分析

Numerical Simulation and Dynamic Analysis of Cavitation on Twisted Hydrofoil

空泡稳定性是螺旋桨设计者须经常考虑的问题。论文采用Schnerr-Sauer空化模型和大涡模拟的方法对Twist-11N扭曲水翼片空泡的动态行为进行数值模拟。在不同空化数和几何攻角的工况下,对比分析脱落频率、空泡体积和压力分布的变化,并用单极子声辐射公式估算噪声特性。计算结果表明,片空泡的发展过程中存在着一个表征其显著脱落行为的失稳空化数,在失稳前后辐射噪声有明显区别,这项研究将为优化空泡动态特征和控制空泡噪声提供技术依据。

Cavitation stability is always considered by propeller designers.Dynamic behavior of sheet cavitation on a Twist-11N hydrofoil is numerically simulated by using the Schnerr-Sauer cavitation model and large eddy simulation.In view of working conditions at different cavitation numbers and different geometry attack angles,the contrast analysis is performed for sheet cavitation shedding frequency,cavitation volume,and pressure distribution.Noise characteristics are obtained by using the formula of monopole acoustic radiation.The results show that there is an unstable cavitation number in the development of sheet cavitation,and there is significant difference between the radiation noise before and after cavitation instability.The results can be used to optimize dynamic characteristics of cavitation and control of cavitation noise.