叶轮与隔流板间隙对射流式自吸离心泵性能的影响  

Effect of the Clearance between Impeller and Fluid Directoron the Performance of Flow-ejecting Self-priming Centrifugal Pump

作　　者：文海罡[1] 秦浩[1] WEN Hai-gang;QIN Hao(Key Laboratory of Fluid and Power Machinery of Ministry of Education,School of Energy and Power Engineering,Xihua University,Chengdu,China,Post Code ： 610039)

机构地区：[1]西华大学流体及动力机械教育部重点实验室能源与动力工程学院

出　　处：《热能动力工程》2018年第7期32-36,共5页Journal of Engineering for Thermal Energy and Power

基　　金：国家高新技术研究发展(863计划)项目(2011AA100506)~~

摘　　要：为分析射流式自吸离心泵叶轮与隔流板间隙对其性能的影响,采用数值模拟的方法得到了5种该间隙下泵外特性曲线、自吸过程泵内部气液两相分布及流动情况,分析表明：随间隙增大,泵的扬程和效率上下波动较小;叶轮内含气率、导流器出口及泵体出口的气相质量流率随间隙增大而下降。兼顾考虑外特性、自吸性能、加工及装配工艺,确定叶轮与隔流板的间隙为1.0 mm最为理想。样机试验表明：设计点扬程34.21 m,效率55.29%;自吸高度为5 m时,自吸时间45 s,满足设计要求。To analyze the effect the clearance between the impeller and the isolating plate of fluid director on the performance of the flow-ejecting self-priming centrifugal pump, a numerical simulation was carried out and the variation of hydraulic properties, gas-liquid two-phase distribution and flow condition during the self-priming process of the pump were obtained with five different clearance sizes. The analysis showed that the fluctuation in the head and efficiency of the pump is small with the gap size. The gas rate of impeller, air mass flow rate of fluid director outlet and pump outlet decrease with the increase in clearance. Considering hydraulic properties, peffomlance of self-priming, processing and assembly process, it is determined that 1.0 mm clearance is the optimum size. The prototype test results showed that the head is 34.21 m and the efficiency is 55.29% under the design condition. When the self-priming height is 5 m, the self-priming time is 45 s which meets the design requirements.

关 键 词：自吸离心泵 叶轮 间隙 气液两相 自吸性能 

分 类 号：TH38[机械工程—机械制造及自动化]