排灌机械工程学报2016，Vol.34Issue(5)：381-385,5.DOI:10.3969/j.issn.1674-8530.15.0094
单叶片螺旋离心泵内部流场数值计算及油膜试验研究
Numerical simulation and oil film observation on flow field in impeller of screw centrifugal pump with single-blade
摘要
Abstract
The flow field in a submersible screw centrifugal pump of 240 specific speed with single-blade is studied by using numerical simulation and experimental observation.The pump fluid domains are meshed by using polyhedral cells and the steady turbulent flow in them are calculated by employing the Realizable k-εturbulence model.The predicted performance curves are compared with measure-ments,and the simulated flow field in the impeller is examined against the flow pattern in oil film vi-sualization.It is shown that the predicted characteristic curves agree well with the measurements and the calculated streamlines on the impeller flow passage walls are consistent with the oil film observa-tions,suggesting the polyhedral mesh has a better accuracy in flow simulations of the impeller in a screw centrifugal pump.Through an analysis of the internal flow field,a leakage flow around the blade inlet is captured,but it becomes weak gradually with the increasing of flow rate.Moreover,under the working conditions of0.6Qd,1.0Qd and 1.4Qd,there exists a severe backflow on the hub surface near the blade suction side around the impeller outlet;especially,at 0.6Qd flow rate,the backflow has oc-cupied an area as large as more than 80%the flow channel width.A backflow also exists in the corner between the blade pressure side and the hub;the smaller the flow rate are,the more serious the back-flow.Under these three working conditions,there exists a larger gradient in the velocity at volute outlet.关键词
单叶片螺旋离心泵/流场/油膜试验/多面体网格/二次流Key words
screw centrifugal pump with single-blade/flow field/oil film observation/polyhedral mesh/backflow分类
农业科技引用本文复制引用
张华,陈斌,施卫东,王炳祺,王震..单叶片螺旋离心泵内部流场数值计算及油膜试验研究[J].排灌机械工程学报,2016,34(5):381-385,5.基金项目
中央高校基本科研业务费专项资金资助项目 （）
合肥工业大学"秋实计划"A类计划项目 （）
