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对以R134a为工质的离心式制冷压缩机级内部流动进行三维CFD分析,其中工质的物性的确定分别采用恒比热容完全气体模型、变比热容完全气体模型和利用实际气体物性表插值方法.CFD的分析结果表明所采用的气体模型对CFD预测的压缩机的级性能和级内部流动结构有着重要的影响.在离心式制冷压缩机级中工质的热力学状态偏离完全气体状态较远,但利用对气体常数进行修正的完全气体状态方程并计及比热容随温度的变化能够对压缩机级性能进行一定精度的预测.但为了准确预测级内基本流动参数、揭示级内的流动结构,需要考虑实际气体的影响,利用实际气体的状态方程或者物性表准确的确定工质的物性.
Three-dimensional CFD analysis was performed on the internal flow of centrifugal refrigerant compressor with R134a as the working fluid. The physical properties of the working fluid were determined by using the constant specific heat capacity complete gas model, the variable specific heat capacity complete gas model and the actual gas property table interpolation method respectively. The results show that the adopted gas model has an important influence on the performance of the compressor and the internal flow structure of the compressor predicted by CFD. At the centrifugal compressor stage, the thermodynamic state of the working fluid deviates from the complete gas state, The complete gas equation of state, which corrects the gas constant, and takes into account the change of the specific heat capacity with temperature can predict the compressor performance to a certain degree of accuracy.But in order to accurately predict the basic flow parameters and reveal the flow structure, we need to consider the actual The influence of gas, the use of real gas equation of state or physical properties of the working fluid to accurately determine the physical properties.