跨临界CO_(2)喷射器关键结构的优化研究  

Optimization of Key Structures for Transcritical CO_(2) Ejector

作　　者：牛擎宇 关欣[1] 宋子晔 秦陶 NIU Qingyu;GUAN Xin;SONG Ziye;QIN Tao(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学能源与动力工程学院,上海200093

出　　处：《动力工程学报》2022年第6期559-567,共9页Journal of Chinese Society of Power Engineering

摘　　要：针对以CO_(2)为工质的喷射器进行二维数值模拟,对喷射器内的非平衡相变、壅塞和激波等现象进行分析,并对喷射器内部流体流动过程中速度、静压和马赫数等参数的变化规律进行深入探讨,研究了喷嘴直径、喷嘴出口到混合室的距离和混合室直径对喷射器性能的影响。结果表明:喷嘴直径、喷嘴出口到混合室距离和混合室直径均存在最优值,使得喷射系数最大,喷射器内部激波强度较小,壅塞现象得到缓解,喷射器性能达到最优。Two-dimensional numerical simulation was carried out for the ejector with CO_(2) as working medium,so as to analyze the following phenomena in the ejector,such as non-equilibrium phase transition,choking and shock wave.In addition,variations of velocity,static pressure and Mach number in the process of fluid flow in the ejector were deeply discussed.Furthermore,effects of nozzle diameter,the distance from nozzle outlet to mixing chamber and diameter of the mixing chamber on injection performance were studied.Results show that there exists an optimal value corresponding to the maximum jet coefficient for the three key structural parameters,respectively.Under the above optimal conditions,the internal shock intensity of the ejector is small,the choking phenomenon can be alleviated,and optimum ejector performance can be obtained.

关 键 词：喷射器性能 激波 壅塞现象 跨临界CO_(2) 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]