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冷压缩机设计目标总压比为15,设计为三级串联运行,设计压比分别为3.2,2.5,1.875,压缩工质为超低温负压氦气。通过气动计算与模拟优化,得到了合理的三级冷压缩机各级转速与各项几何参数。通过CFD模拟计算,得到了三级冷压缩机在设计工况下的流量、压比和等熵效率值。并以第一级为例,对压缩机内部模拟流场进行了分析,表明设计冷压缩机内部流场压力分布均匀,没有出现较大的流动分离与激波。通过对各级冷压缩机选取大量工况点进行模拟计算,得到了各级的预估工作性能曲线。结果表明,各级的设计都满足流量范围随级数增加而增大的要求,且各级目标工况处都在该级的高效区范围内,能够满足设计目标。
Cold compressor design goal total pressure ratio of 15, designed for three-stage series operation, the design pressure ratio were 3.2,2.5,1.875, compressed refrigerant for the cryogenic vacuum helium. Through the aerodynamic calculation and simulation optimization, the reasonable three-stage cold compressor rotational speed and geometric parameters are obtained. Through the CFD simulation calculation, the flow, pressure ratio and isentropic efficiency of the three-stage cold compressor at design conditions were obtained. Taking the first stage as an example, the simulation flow field inside the compressor is analyzed, which shows that the pressure distribution inside the cold compressor is uniform and there is no large flow separation and shock wave. Through the calculation of a large number of operating points at all levels of cold compressors, the estimated performance curves at all levels were obtained. The results show that the design at all levels meets the requirements of the flow range increasing with the number of stages, and the target operating conditions at all levels are within the high efficiency range of the level to meet the design goals.