摘要
为研究喷射器内流场特性及其与液环泵的匹配关系,在液环泵进口前串联喷射器,通过数值模拟和试验相结合的方法对液环泵喷射器系统内流动进行研究,分析喷射器内部超声速射流产生的激波现象及其与边界层相互干扰引起的流动分离复杂流动结构,研究不同尺寸喷射器和液环泵的匹配关系及其对泵性能的影响机理.结果表明:喷嘴出口在压差作用下产生超声速射流,形成规则分布的激波串,激波与边界层相互干扰引起了流动分离,压力、密度和马赫数等参数在喷嘴出口呈振荡分布;液环泵进口前串联大气喷射器,在合理的匹配条件下能提升系统吸入口的真空度及流量,改善液环泵进口的工作条件;一定范围内随着喷射器几何尺寸的增大,引射真空度逐渐增大、泵进口吸气量逐渐提升,喷射器有效工作范围增大.
To study the internal flow field characteristics of the ejector and its matching relation with the liquid ring pump, the ejector was connected in front of the liquid ring pump inlet,and the internal flow in the liquid ring pump ejector system was studied by combining numerical simulation and experiment. The shock wave phenomenon generated by the supersonic jet inside the ejector,and the complex flow structure caused by the interaction between the shock wave and the boundary layer were analyzed.The matching relation between different size ejector and liquid ring pump,and its influence mechanism on pump performance were also studied.Results show that the supersonic jet is produced at the nozzle outlet under the effect of pressure difference,and the regular shock wave string is formed.The flow separation is caused by the interaction between the shock wave and the boundary layer.The parameters such as pressure,density and Mach number are oscillatory at the nozzle outlet.The air ejector connected in front of the liquid ring pump inlet would increase the vacuum and flow rate of the suction port and improve the inlet working conditions of the liquid ring pump under reasonable matching conditions.Within a certain range,with the increase of the geometry size of the ejector,the vacuum of ejector inlet increases gradually,the suction capacity of pump inlet also increases gradually,and the effective working range of the ejector is extended.
作者
蒋利杰
张人会
陈学炳
JIANG Lijie;ZHANG Renhui;CHEN Xuebing(School of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Key Laboratory of Fluid Machinery and Systems of Gansu Province,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2021年第4期8-13,共6页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(51979135)
国家重点研发计划资助项目(2016YFB200901)。
关键词
液环泵
喷射器
激波现象
流动分离
匹配特性
真空度
liquid-ring pump
ejector
shock wave phenomenon
flow separation
matching characteristic
vacuum
