基于结构化网格技术的螺旋桨定常空泡性能数值分析

为了研究定常状态下螺旋桨的敞水性能和空泡性能,采用基于粘流理论的CFD方法开展了系统地计算分析。采用结构化网格方案,将计算区域划分为两个计算区域,内域包含螺旋桨,并将桨叶表面以及桨毂表面的网格进行加密。通过将螺旋桨推力、转矩系数及效率等水动力特性参数的计算值与试验数据进行对比分析,验证了本数值方法的可靠性。利用多相流混合模型计算了螺旋桨的定常空泡性能,并简要分析了不同空泡数下的螺旋桨空泡性能,为以后预报螺旋桨空泡性能提供一种可行方案。

Study on steady cavitation performance of propeller based on structured grid technique

In order to study the cavitation performance and open water performance of the propeller, the computational fluid dynamics (CFD) method was used to numerically simulate propeller in open water. A structured grid scheme was adopted, and the computation domain was separated into two sub-domains, in which the propeller was contained in inner domain. Mesh was local refined on propeller surface and near wake flow field. Hydrodynamic performance parameters such as thrust coefficients, torque coefficients, efficiency and cavitation area were calculated and compared with experimental data. The results showed that numerical results agreed well with experimental data which validated the reliability of the numerical method. The cavitation performance of the propeller was calculated by using mixture model and the effect of cavitation number was analyzed in order to provide a feasible plan for the prediction of propeller cavitation performance.