流体机械

2019, v.47;No.569(11) 8-12+7

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滚动活塞压缩机排气通道气流脉动研究
Analysis on Pulsation of Gas Flow in Exhaust Passage of Rolling Piston Compressors

徐嘉;刘喜兴;梁社兵;邓丽颖;
Xu Jia;Liu Xixing;Liang Shebing;Deng Liying;State Key Laboratory of Air-conditioning Equipment and System Energy Conservation;Gree Electric Appliance,Inc.of Zhuhai;

摘要(Abstract):

针对双缸压缩机噪声异常问题,采用RNG k-ε湍流模型获得压缩机排气通道三维非定常流动的压力脉动情况。结合滑移网格技术,并考虑排气通道扰动源,对流场时域与频域进行分析。结果表明,压力脉动频率主要成分为压缩机运转频率,其中消音腔压力脉动峰值出现在2倍频和14倍频,电机下腔压力脉动峰值出现在2倍频和3倍频,电机上腔压力脉动峰值出现在2倍频;消音器对高频峰量抑制效果明显;改进方案电机上、下腔2倍频峰量明显低于原方案。声学试验显示改进方案的噪声总值最大降幅达1.81dB,固此基于CFD方法分析和优化压缩机排气通道流场结构是可行的。
In order to analyze abnormal noise of double cylinder compressors,the pressure pulsation of three-dimensional unsteady flow of the compressor exhaust passage was obtained using the RNG k-ε turbulence model.The time and frequency domain of flow field were analyzed in combination with the sliding grid technology and by considering the source of the exhaust passage disturbance.The results show that the main component of pressure pulsation frequency is the compressor operating frequency,of which the peak value of pressure pulsation of the muffler cavity appears at double and fourteen times frequency,the peak of the lower cavity of the motor appears at double and triple frequency,and the peak of the upper cavity of the motor appears at double frequency. The muffler has an obvious effect on high frequency peak value.The peak of double frequency of upper and lower cavity of the motor in the improved scheme is obviously lower than that in the original scheme. The acoustic experiment shows that the maximum decrease of the total noise in the improved scheme is 1.81 dB.Therefore,it is feasible to analyze and optimize flow field structure of compressor exhaust passage based on computational fluid dynamics(CFD).

关键词(KeyWords): 滚动活塞压缩机;压力脉动;数值模拟;滑移网格;时域与频域分析
rolling piston compressors;pressure pulsation;numerical simulation;sliding mesh;time-frequency domain analysis

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作者(Author): 徐嘉;刘喜兴;梁社兵;邓丽颖;
Xu Jia;Liu Xixing;Liang Shebing;Deng Liying;State Key Laboratory of Air-conditioning Equipment and System Energy Conservation;Gree Electric Appliance,Inc.of Zhuhai;

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