CO_(2)两相引射器预混合区膨胀角特性研究  

Study on expansion angle characteristics of pre-mixing region of CO_(2) two-phase ejector

作　　者：胡宏伟 郑立星 郝艳红[1] 王维波 卢苇 Hu Hongwei;Zheng Lixing;Hao Yanhong;Wang Weibo;Lu Wei(School of Electric Power,Civil Engineering and Architecture,Shanxi University,Taiyuan 030006,China;School of Mechanical Engineering,Guangxi University,Nanning 530004,China)

机构地区：[1]山西大学电力与建筑学院 [2]广西大学机械工程学院

出　　处：《低温与超导》2022年第6期42-48,共7页Cryogenics and Superconductivity

基　　金：国家自然科学基金(51806132);中央引导地方科技发展基金(YDZX20201400001939);山西省高等学校科技创新项目(201802011)资助。

摘　　要：基于特征线法利用有限差分法建立CO_(2)两相引射器主动流超音速膨胀模型。通过模拟主动流喷嘴出口激波链的发展过程,分析了不同工况与结构参数对膨胀角的影响。研究表明,同一喷嘴距(NXP)下,较大的主动流压力、引射系数和膨胀比,会产生较大的膨胀角。而较大的截面比和引射流压力,会减小膨胀角度。一定范围内的较大膨胀角会增加膨胀波长度,减小引射器出口压力。此外,拟合获得了膨胀角和喷嘴距计算关联式,为预测引射器结构与性能参数间关系提供参考。Based on the characteristic method, a supersonic expansion model of the CO_(2)two-phase ejector was established by the finite difference method. By simulating the development of the shock chain at the exit of the nozzle, the effects of different working conditions and structural parameters on the expansion angle were analyzed. The results show that the larger pressure of primary flow, entrainment ratio and expansion ratio will produce larger expansion angle under the same nozzle exit position. On the other hand, the larger cross-sectional area ratio and pressure of secondary flow will reduce the expansion angle. The larger expansion angle in a certain range will increase the expansion wave length and decrease the ejector outlet pressure. In addition, the computational correlation of the expansion angle and NXP were obtained by polynomial fitting, which can provide a reference for predicting the relationship between the structure and performance parameters of the ejector.

关 键 词：CO_(2)引射器 膨胀角 特征线法 膨胀波 拟合关联式 

分 类 号：TB66[一般工业技术—制冷工程]