流体机械

2021, v.49;No.588(06) 15-21

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滚动转子压缩机排气流噪声数值计算与机理分析
Numerical computation and mechanism analysis of the aerodynamic noise of rolling piston compressor during exhaust process

李天宇;蒋伟康;王海军;
LI Tianyu;JIANG Weikang;WANG Haijun;Institute of Vibration Shock & Noise,Shanghai Jiaotong University;Shanghai Highly Electrical Appliances Co.,Ltd.;

摘要(Abstract):

为了辨识滚动转子压缩机排气气流噪声的主要成分,对其排气过程建立了计算气动声学分析模型。首先使用基于滑移网格和脱落涡模拟的CFD计算对压缩机排气过程的压力脉动进行直接求解,结合声学有限元计算分析了压力脉动中各成分的贡献;其次使用基于动网格的CFD计算求解压缩泵腔及消声器的流场,计算了泵腔出口流量变化。仿真结果和实验测量的一致结果表明,排气通道内压力脉动中声学响应成分远大于湍流脉动成分,且在噪声集中的频段内声源主要为泵腔出口的单极子噪声,而整体声腔模态对该声源的频率分布有影响。泵腔排气口的单极子噪声源是滚动转子压缩机气动噪声的最主要声源。
In order to identify the main components of exhaust flow noise of the rolling piston compressor,a simplified CAA model is built for its exhaust process.Firstly,CFD computation based on sliding mesh and detached eddy simulation is used for the direct solution of pressure fluctuation during the exhaust process of the compressor,then in combination with acoustic FEM computation,the contribution of major components in pressure fluctuation is briefly analyzed.Secondly,the flow fields in the compression pump cavity and around the muffler are resolved using CFD computation based on dynamic mesh method,and change in flow rate at the exit of the pump cavity is calculated.The results of consistency between the simulation and experimental measurement show that the acoustic response component in the pressure pulsation in the exhaust channel is much larger than the turbulent pulsation component,and the sound source in the noise-concentrated frequency band is mainly the monopole noise at the exit of the pump cavity,whereas the overall acoustic cavity mode has an influence on the frequency distribution of the sound source.The monopole noise source at exhaust port of the pump cavity is the principal sound source of the aerodynamic noise of the rolling piston compressor.

关键词(KeyWords): 滚动转子压缩机;排气噪声;压力脉动;单极子声源;计算气动声学
rolling piston compressor;exhaust noise;pressure fluctuation;monopole noise source;computational aeroacoustics

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基金项目(Foundation): 工信部2018年绿色制造系统集成项目“高效多联式空调(热泵)转子压缩机绿色设计平台建设”

作者(Author): 李天宇;蒋伟康;王海军;
LI Tianyu;JIANG Weikang;WANG Haijun;Institute of Vibration Shock & Noise,Shanghai Jiaotong University;Shanghai Highly Electrical Appliances Co.,Ltd.;

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