【摘要】 涡旋压缩机作为电动汽车空调系统的重要组成部分，其性能对空调系统的有效运行至关重要。将基圆渐开线与变径基圆渐开线和基圆渐开线相结合，建立变壁厚涡旋压缩机的三维几何模型。研究了R134a变壁厚涡旋压缩机的非稳态特性，通过UDF实现动涡旋盘的偏心运动。应用CFD动网格技术对变壁厚涡旋压缩机的内部流场进行模拟，探讨了出口质量流量周期性波动的原因，并进一步研究了出口压力和转速对压缩机性能的影响。结果表明：出口流通面积和排气腔压力是影响出口质量流量呈周期性波动的主要因素；出口压力从0.64 MPa增加到1.60 MPa,压缩机等熵效率从50.81%提升到78.66%,而容积效率从93.15%提高至94.01%随后下降至92.57%;转速的增加同样对等熵效率和容积效率有一定影响，保持出口压力为1.60 MPa,转速从2 000 r/min增加到3 600 r/min,压缩机的容积效率和等熵效率分别从84.01%和72.84%提升到95.34%和82.86%。更多还原

【Abstract】 As an important part of the air conditioning system of electric vehicles, the performance of the scroll compressor plays a crucial role in the effective operation of the air conditioning system.A 3D geometric model of a variable wall thickness scroll compressor was built by combining base circle involute with variable radius base circle involute and base circle involute.The unsteady characteristics of R134a variable wall thickness scroll compressors were investigated.The eccentric motion of the dynamic scroll was realized by UDF.The internal flow field of the variable wall thickness scroll compressor was simulated by using CFD dynamic grid technology.The reason of periodic fluctuation of outlet mass flow was discussed, and the influence of outlet pressure and speed on compressor performance was further studied.The results show that the outlet flow area and discharge chamber pressure are the main factors affecting the periodic fluctuation of outlet mass flow; when the outlet pressure increases from 0.64 MPa to 1.60 MPa, the isentropic efficiency of the compressor increases from 50.81% to 78.66%,and the volumetric efficiency increases from 93.15% to 94.01% and then decreases to 92.57%;the increase of the speed also has a certain effect on the isentropic efficiency and volumetric efficiency, when the outlet pressure is maintained at 1.60 MPa and the speed increases from 2 000 r/min to 3 600 r/min, the compressor volume efficiency and isentropy efficiency increase from 84.01% and 72.84% to 95.34% and 82.86%,respectively.更多还原