Simulating Flow in Pump Impeller of Airborne Centrifugal Refrigeration Compressor
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摘要: 离心式制冷压缩机对机载蒸汽压缩制冷系统有重要影响；大流量离心制冷压缩机的运行效率远大于小流量压缩机效率，针对现有的双级小流量离心制冷压缩机，通过实验测试和CFD仿真，对制冷剂R134a在泵式叶轮内的流动进行了分析。结果表明：在所测试参数条件下，叶轮进口靠近压力面处的制冷工质出现明显的二次流现象，气体流动出现盖面分离，叶轮内部损失较大；改变叶轮叶片出口安装角可提高效率及压比；针对不同叶轮叶片数的仿真计算对比，可确定在所设计模型中最佳叶片数。Abstract: A large-flow centrifugal refrigeration compressor has an important impact on an airborne vapor compression refrigeration system and a much higher operating efficiency than a small-flow centrifugal refrigeration compressor. The flow of refrigerant R134a in the pump impeller of the existing two-stage small-flow centrifugal refrigeration compressor was analyzed through experiments and CFD simulations. The results show that under the condition of the experimental parameters, the secondary refrigerant phenomenon occurs in the refrigerant working near the pressure surface of the pump impeller inlet. The gas flow has a cover surface separation and the impeller has a large internal loss. Changing the impeller blade outlet installation can improve the efficiency and pressure ratio. This paper also simulates and calculates different impeller blades to determine the optimal number of blades in the designed model. The comparison of the simulation results of different impeller blades determines the optimal number of blades in the designed model.
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Key words:
- centrifugal refrigeration compressor /
- small flow /
- pump impeller /
- refrigerant R143a /
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表 2 设计工况下变叶片安装角压缩机性能指标
名称 模型1 模型2 原模型 模型3 模型4 压比 1.925 1.89 1.87 1.86 1.75 效率/% 61.1 62.5 63.2 62.6 62.2 
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