两级液环压缩机内流场及外特性  

Internal flow field and hydraulic characteristics of two-stage liquid ring compressor

作　　者：张人会[1,2] 刘博文 郭广强[1,2] 俞帅年 郑直[1,2] ZHANG Renhui;LIU Bowen;GUO Guangqiang;YU Shuainian;ZHENG Zhi(College of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou,Gansu 730050,China;Gansu Provincial Key Laboratory of Fluid Machinery and Systems,Lanzhou University of Technology,Lanzhou,Gansu 730050,China)

机构地区：[1]兰州理工大学能源与动力工程学院,甘肃兰州730050 [2]兰州理工大学甘肃省流体机械及系统重点实验室,甘肃兰州730050

出　　处：《排灌机械工程学报》2024年第6期541-547,共7页Journal of Drainage and Irrigation Machinery Engineering

基　　金：甘肃省重点研发计划项目(21YF5GA077);国家自然科学基金资助项目(51979135)。

摘　　要：采用数值模拟与试验相结合的方法,以2SY-6两级液环压缩机为研究对象,对多级液环压缩机在不同工况、不同叶轮宽度比下内流场及性能进行对比分析,结果表明:二级叶轮叶片载荷小于一级叶轮,其排气口区域锯齿形气液交界面较一级叶轮更为光滑.一级叶轮吸气口区域回流强度相对于二级叶轮吸气口区域更强,一级叶轮吸气口区域湍动能明显大于二级叶轮.等外径设计的二级叶轮进出口压缩比远小于一级叶轮,二级叶轮的做功能力小于一级叶轮.由于一级叶轮的进出口压缩比较大且均位于效率极值点的右侧,一级叶轮效率随泵的压缩比增大而逐渐下降,而二级叶轮压缩比范围包含极值点,所以其效率先增后减.液环压缩机随着二级叶轮宽度的增大,其吸气能力越强,各个工况下的流量均逐渐增大.低压缩比工况下的效率随k值减小逐渐增大,高压缩比工况下的效率随k值减小先增后减.随首次级叶轮宽度比k值的减小,二级叶轮的压缩比曲线逐渐向上平移,而一级叶轮的压缩比曲线逐渐向下平移.随泵出口压力的增大,首次级叶轮压缩比的比值曲线下降趋于平缓,k值为2.2时两级叶轮压缩比的比值趋于1.1.By using a method that combines numerical simulation and testing,the internal flow field and hydraulic performance of a multi-stage liquid ring compressor under different working conditions as well as different impeller width ratios were compared and analyzed on the 2SY-6 two-stage liquid ring compressor.The analysis of the results shows that the blade load of the second-stage impeller is smaller than that of the primary impeller,so the gas-liquid interface at the outlet of the second-stage impeller is smoother than that of the primary impeller.The reflux intensity of the first-stage impeller suction port area is stronger than that of the second-stage impeller suction port area,and the turbulent kinetic energy of the first-stage impeller suction port area is obviously greater than that of the second-stage impeller.In the equal impeller outer diameter design,the compression ratio of the secondary impeller is far less than that of the primary impeller,and the power capacity of the secondary impeller is lower than that of the primary impeller.As the compression ratio of the inlet and outlet for the primary impeller is relatively large and located on the right side of the efficiency maximum point,the efficiency of the first-stage impeller gradually decreases with the increase of the pump compression ratio,while the compression ratio range of the second-stage impeller includes the maximum point,so its efficiency first increases and then decreases.With the increase of the width of the secondary impeller,the suction capacity gradually increases,and the flow rate of each condition also increases.The efficiency under low compression ratio conditions gradually increases with the decrease of the k value,and the efficiency under high compression ratio conditions increases first and then decreases with the decrease of the k value.The compression ratio of primary and secondary impellers increases with the increase of the pump outlet compression ratio.With the decrease of the width ratio of the primary and secondary impellers,t

关 键 词：液环压缩机 内流场 回流 压缩比 叶轮宽度比 

分 类 号：S277.9[农业科学—农业水土工程] TH36[农业科学—农业工程]