集成电机推进器叶轮转子流体动力学性能CFD分析

Hydrodynamic Analysis of Impeller Rotor of Integrated Motor Propulsor on CFD

针对集成电机推进器一体化结构导致的推进器过流面积小,工作效率低的问题,首先在对特种电机磁场分析的基础上,设计了八对极和十二对极电机转子,并通过改进的升力法设计了叶轮叶片以改善推进器性能。然后,采用高质量结构化网格对推进器数值模拟系统各部件进行区域离散,利用CFD方法预报其扬程和效率等外特性,分析其内部流动情况。在设计工况附近,计算结果与实验数据的吻合良好,并由计算结果得出:十二对极叶轮转子推进器效率要比八对极在各个工况下平均高约3.9%。通过计算叶片压力分布,验证了该叶轮转子叶片设计中采用的线型;通过观察叶轮转子速度矢量分布,分析了叶轮转子设计中存在的缺陷,为其改进设计提供了参考。

In order to resolve the problem that the flow passage area of integrated motor propulsor（IMP） is small and its efficiency is low because of the structure which propeller integrates with the motor/rotor in,eight and twelve pole pairs rotor of permanent magnetic brushless DC motor was proposed based on magnetic field analysis of special motor,and impeller blade was designed by the method of improved lifting to this proplem.Secondly,Each part of the numerical model was meshed by high quality hexahedral mesh.The macro-parameters such as total head and efficiency of different mass flow rate at the same rotating speed were obtained by computational fluid dynamics（CFD） method.The results agreed well with test data at the design condition,and the efficiency of the twelve pole pairs rotor is higher 3.9% averagely in each working condition than eight pole pairs.The impeller line-type adopted was validated by calculating and analyzing its pressure distribution.After observing the velocity vector distribution near impeller rotor,a fault in design was analyzed,and some proposals for improving impeller rotor were offered in the end.