小型车用压气机气动噪声分析

Analysis of Aerodynamic Noise on Small Centrifugal Compressor

以车用压气机为研究对象,基于CFD稳态的RANS方程湍流模拟计算压气机的流场特性和宽频噪声,结果表明叶轮区域是压气机的主要噪声源.基于大涡模拟(LES)和Ffowcs-Williams&Hawkings(FW-H)方程的声比拟方法,以压气机叶轮为声源对压气机离散噪声进行预测分析.结果表明该压气机主要噪声源在叶轮区域.以压气机叶轮为声源进行仿真计算所得声压与实验值大体趋势相同,仿真值比实验值略高,误差在10%以内,表明该仿真计算方法可行,对进一步研究压气机噪声控制具有参考价值.

This paper focuses on the vehicle compressor. Firstly, the characteristics of flow field and broadband noise of compressors are calculated based on the steady state RANS equations, and the results demonstrate that the main noise source of the compressor locates in the impeller areas.Then,based on the large eddy simulation （LES） and Ffowcs - Williams ＆ Hawkings （FW-H） equation of the acoustic analogy method,the compressor discrete noise is predicted, taking the compressor impeller as the main noise source.The results show that the main noise source of compressor locates in compressor impeller areas.In addition,by means of simulation, the sound pressure varies approximately in the same trend with the ex- periment value, taking compressor impeller as the main noise source. The simulation value is slightly greater than the experimental value with the error less than 10-.Therefore,it is concluded that the simula- tion calculation method is feasible, which provides the reference value for further study on the vehicle com- pressors.