旋转式压缩机消音器内压力脉动研究

Study of Pressure Pulsation in Discharge Muffler of Rotary Compressor

旋转式压缩机中排气侧气流的压力脉动是它的一个主要噪声源,因此广泛使用消音器来减缓气流脉动、降低排气噪声。通过对消音器内压力脉动的状况进行研究,可以为消音器的设计及改进提供一种评价的手段,并且为旋转式压缩机噪声的进一步研究奠定基础。本文使用Helmholtz共鸣器法建立了排气消音器压力脉动的数学模型,与压缩机气缸内热力过程及气阀运动耦合,求解出消音器各个腔室内压力脉动的变化。同时搭建了试验系统进行测试,验证了数值分析结果的可靠性。

Gas pulsatinn in the dischargs side of a rotary compressor is one of the main sources of noise; and muffler is widely used to decrease the gas pulsation and noise level. Investigations of pressure pulsation in the muffler can provide not only a method to evaluate the muffler design and improvement, but also a base for advanced study of noise in rotary compressor. In this paper He lmholtz resonator approach is used to build a mathematic model of pressure pulsation in the muffler, and coupled with the valve dynamic model and thermodynamic model in the cylinder to obtain the pulsation status. Experiments are also carried out and it is proved that the calculation models are reliable.