A Parametric Study on the Effect of Mixing Chamber for Expansion Work Recovery CO_(2) Ejector  

作　　者：FENG Xu ZHANG Zhenying WU Yuting TIAN Dingzhu 

机构地区：[1]Key Laboratory of Enhanced Heat Transfer and Energy Conservation,Ministry of Education and Key Laboratory of Heat Transfer and Energy Conversion,Beijing Municipality,College of Environmental and Energy Engineering,Beijing University of Technology,Beijing 100124,China [2]School of Architecture and Civil Engineering,North China University of Science and Technology,Tangshan 063210,China

出　　处：《Journal of Thermal Science》2022年第6期1914-1927,共14页热科学学报（英文版）

基　　金：support of Projects Supported by Natural Science Foundation of Hebei Province(E2020209121);Beijing Municipal Natural Science Foundation(NO.3181001);S&T Program of Hebei(20474501D)。

摘　　要：A numerical study of supercritical CO_(2) two-phase flow in the ejector was carried out by computational fluid dynamics(CFD) methods. Through the comparison of simulation results and available experimental data in the literature, the accuracy of the three-dimensional CFD model was verified. A comparison of the effects of four turbulence models on the simulation calculation results was also presented. The distributions of pressure, velocity, two-phase volume fraction, shock wave and exergy flux inside the ejector were analyzed. The effects of the mixing section geometry on the performance of the ejector were obtained. Then, the entrained performance of the ejector was investigated by changing the area ratio between the constant-area mixing chamber and the outlet of the motive nozzle(AR) and the ratio between the length and the diameter of the constant-area mixing chamber(LDR). Finally, the optimum AR and LDR were determined to be 8.3 and 8.1, respectively based on the maximum entrained ratio and the minimum exergy destruction. Through optimizing the mixing chamber geometry, the minimum total exergy destruction and the maximum mass entrainment ratio(MER) of the ejector can attain 0.33 J/(kg·K) and 0.698, respectively.

关 键 词：CO_(2)ejector mixing chamber CFD AR LDR 

分 类 号：TB657[一般工业技术—制冷工程]