Numerical simulation on flow performance and blade profile optimal design of mixedflow pump impeller
Xie Rong, Shan Yujiao, Wang Xiaofang
(Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, Dalian University of Technology, Dalian, Liaoning 116024, China)
Abstract: A numerical calculation was carried out to simulate threedimensional turbulent flow in a high specificspeed mixedflow pump impeller under design condition. Through the analysis of impeller internal flow, some problems caused by the unsuitable local structure were found, such as vast vortexes aeras and wall flow separations, which added flow losses. Aimed at the problems, a multiparameter optimal method was adopted to redesign blade profile, and the action rules of blade profile on impeller internal flow were analyzed. The results show that the horse hoof shaped vortexes at impeller inlet and passage vortexes and wall flow separations can be removed and the passage vortex intensity and influencing range are reduced by adjusting blade curvature. The hydraulic efficiency of the optimized impeller increases 4.74% relatively, and the head per power dissipation increases 11.5%. The calculated data of impeller performance parameters are in good agreement with the experimental ones, which proves accuracy and reliability of the adopted method and model.
[1]Anagnostopoulos J S.A fast numerical method for flow analysis and blade design in centrifugal pump impellers[J].Computers and Fluids,2009,38(2):284-289.[2]Dakshinamoorthy D,Khopkar A R,Louvar J F,et al.CFD simulation of shortstopping runaway reactions in vessels agitated with impellers and jets[J].Journal of Loss Prevention in the Process Industries,2006,19(6):570-581.[3]Zangeneh M,Goto A,Takemura T.Suppression of secondary flows in a mixed-flow pump impeller by application of three-dimensional inverse design method-Part 1:Design and numerical validation[J].Journal of Turbomachinery,1996,118(3):536-543.[4]Muggli F A,Holbein P,Dupont P.CFD calculation of a mixed flow pump characteristic from shutoffto maximum flow[J].Journal of Fluids Engineering,2002,124(3):798-802.[5]Yu S C M,Ng B T H,Chan W K,et al.The flow patterns within the impeller passages of a centrifugal blood pump model[J].Medical Engineering and Physics,2000,22(6):381-393.[6]杨敏官,刘栋,贾卫东,等.离心泵叶轮内部三维湍流流动的分析[J].江苏大学学报:自然科学版,2006,27(6):524-527.Yang Minguan,Liu Dong,Jia Weidong,et al.Analysis on turbulent flow in impeller of centrifugal pump[J].Journal of Jiangsu University:Natural Science Edition,2006,27(6):524-527.(in Chinese)[7]龙志军,裴毅,杨晓珍,等.离心泵叶轮内部湍流流场的数值模拟[J].排灌机械,2005,23(2):8-10.Long Zhijun,Pei Yi,Yang Xiaozhen,et al.Numerical simulation of turbulent flow inside impeller of centrifugal pump[J].Drainage and Irrigation Machinery,2005,23(2):8-10.(in Chinese)[8]谈明高,刘厚林,王勇,等.叶轮外径对离心泵内流影响的CFD分析[J].排灌机械,2009,27(5):314-318.Tan Minggao,Liu Houlin,Wang Yong,et al.CFD ana-lysis on effects of impeller outlet diameter on flow field in centrifugal pump[J].Drainage and Irrigation Machinery,2009,27(5):314-318.(in Chinese)[9]席光,王晓锋,蒋三红,等,基于三维粘性流动分析的离心压缩机叶轮设计方法[J].工程热物理学报,2002,23(S1):54-57.Xi Guang,Wang Xiaofeng,Jiang Sanhong,et al.Design method of centrifugal compressor impellers based on 3D viscous flow analysis[J].Journal of Engineering Thermophysics,2002,23 (S1):54-57.(in Chinese)[10]席光,卢金铃,祁大同.混流泵三元叶片优化设计方法研究[J].工程热物理学报,2004,25(6):952-955.Xi Guang,Lu Jinling,Qi Datong.Research on the optimization method of 3D blade in mixed-flow pump[J].Journal of Engineering Thermophysics,2004,25 (6):952-955.(in Chinese)