基于CFD仿真的涡旋压缩机吸气间隙分析

Analysis of the suction gap in scroll compressor based on CFD computation

涡旋压缩机静盘底部吸气间隙设计用来增加该压缩腔吸气流量,并对吸气过程和性能产生明显影响。为了研究吸气间隙的影响规律,采用CFD仿真研究了不同吸气间隙对于吸气过程非定常压力场、流量分布和性能的影响,结果发现吸气压力和流量都呈现非定常波动,随着吸气间隙减小吸气压力不断增大,吸气流量不断减小,吸气压力的增加使得压缩机功率降低,总体能效增加。通过整机测试发现在DOE-B工况吸气间隙从有到无,冷量降低0.70%,输入功率降低约1.01%,能效提升约0.32%,验证了所建立仿真方法的有效性,研究可为涡旋压缩机吸气过程的优化设计提供参考。

The suction gap at the bottom of the stationary disc in the scroll compressor is designed to increase the suction flow rate of the compression chamber and have a signifi cant impact on the suction process and performance.To study the infl uence of suction gap,CFD simulation was used to study the ef fects of dif ferent suction gaps on the unsteady pressure fi eld,fl ow distribution,and performance.The results showed that the suction pressure and fl ow rate showed unsteady fl uctuations.As the suction gap decreased,the suction pressure continued to increase,and the suction fl ow rate continued to decrease.The increase in suction pressure led to a decrease in compressor power and an overall increase in energy e ffi ciency.Through whole machine testing,it was found that under DOE-B condition,when the suction gap was from present to absent,the cooling capacity decreased by 0.70%,the input power decreased by about 1.01%,and the energy e ffi ciency increased by about 0.32%.This verifi ed the ef fectiveness of the established CFD simulation method,and the research can provide guidance for the optimization design of the suction process of scroll compressors.