The scroll compressor is a kind of positive-displacement compressor applied in refrigeration systems, heat pump systems, and air conditioner systems. Using the spring smoothing method and considering the heat transfer, the numerical simulation model of the scroll compressor is established under standard working conditions. The results show that the CFD model is well validated by the experiment result. The compressor performance and the working process are analyzed. The pre-compression and the over-compression phenomenon are also studied. Moreover, the temperature distribution and velocity distribution of gas flow in the compressor are illustrated. The result shows that the pre-compression can improve the performance of the scroll compressor and the optimization of the suction channel geometry can provide a smoother suction process. Under the combined effect of the pre-compression and heat transfer, the refrigerating capacity is increased by approximately 0.54 kW and the volume efficiency is increased by approximately 2.2%. The additional power loss due to over-compression is 47.6615 W, and the setting of over-compression discharges can reduce the pressure and power loss. This study is helpful to the performance prediction and the structural optimization of the scroll compressor.

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基于CFD的涡旋压缩机瞬态流动及热力学分析

涡旋压缩机是一种应用于制冷系统、热泵系统、空调系统的容积式压缩机。采用弹簧平滑法并考虑传热，建立了标准工况下涡旋压缩机的数值模拟模型。结果表明，实验结果很好地验证了CFD模型的有效性。分析了压缩机的性能和工作过程。还研究了预压缩和过压缩现象。此外，还示出了压缩机内气流的温度分布和速度分布。结果表明，预压缩可以提高涡旋压缩机的性能，并且吸入通道几何形状的优化可以提供更顺畅的吸入过程。在预压缩和传热的共同作用下，制冷量增加约0.54kW，容积效率增加约2.2%。过压缩造成的额外功率损失为47.6615 W，过压缩放电的设置可以减少压力和功率损失。该研究有助于涡旋压缩机的性能预测和结构优化。