CO_2两相喷射器性能和建模的研究现状

Research Status of CO_2 Two-Phase Ejector Performance and Modeling

跨临界CO_2蒸气压缩系统中喷射器的应用使得系统性能提高。笔者概述了系统工况条件、喷射器几何参数和激波特性对CO_2两相喷射器性能参数的影响,阐述了理论模型研究的应用与发展。总结得出:工作流体入口状态对喷射器性能影响较引射流体大;喷嘴喉部面积和混合室尺寸对喷射器性能有很大影响;激波特性的流动可视化研究需进一步发展;建模研究多样化发展,CFD模型仍需拓展适用性、流动模型准确性和激波特性的研究,计算代价小的其它模型也应拓展其适用性与精度。

The application of ejector in transcritical CO2 vapor compression systems results in enhanced system performance.In the paper,the influences of system operating conditions,ejector geometric parameters and shock waves characteristics on the performance parameters of CO2 two-phase ejector were discussed,the application and development of theoretical models were expounded.It is concluded that the status of the motive fluid inlet has a greater influence on the ejector performance than the suction fluid,the nozzle throat area and the size of mixing chamber have a great influence on the performance of ejector.The visualization of shock waves characteristics needs further development.Modeling studies diversify and the CFD models still need to expand the applicability,the accuracy of flow model and shock waves characteristics,and other models with small computational costs should also expand its applicability and accuracy.