流体机械

2017, v.45;No.545(11) 34-40

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不同叶片出口角下离心泵压力脉动及径向力分析
Analysis on Pressure Fluctuation and Radial Thrust of Centrifugal Pump under Different Blade Outlet Angle

张忆宁;曹卫东;姚凌钧;姜昕;
ZHANG Yi-ning;CAO Wei-dong;YAO Ling-jun;JIANG xin;Technical and Research Center of Fluid Machinery Engineering,Jiangsu University;

摘要(Abstract):

在试验结果和数值模拟吻合良好的基础上,开展叶片出口角对离心泵压力脉动以及径向力影响的研究。本文以两级矿用潜水离心泵为研究对象,建立4组不同叶片出口角叶轮模型,通过数值模拟获得离心泵外特性,叶轮、导叶、蜗壳的压力脉动分布及叶轮径向力特性,并进行对比分析。结果表明:离心泵内压力脉动呈周期性,当β2=16°和20°时叶轮出口压力脉动强度较大。随着叶片出口角增大,导叶和蜗壳内压力脉动均逐渐增强,且导叶内压力脉动强度大于蜗壳,不同叶片出口角下,导叶及蜗壳内脉动主频均为叶频。叶片出口角的改变也会对叶轮径向力矢量分布产生一定影响,随着β2增大,叶轮径向力逐渐增大,且首级叶轮轴向力大于次级叶轮,蜗壳比导叶有更好地改善叶轮轴向力的作用。
The effect of blade outlet angle on pressure fluctuation and radial thrust of centrifugal pump are studied based on the experimental results and numerical simulation were in good agreement.A two-stage mine centrifugal pump was chosen for the research object,four kinds of impellers were established with different blade outlet angle.The external performance of centrifugal pump was predicted with CFD simulation,the pressure fluctuation distribution in impeller,vane and volute as well as radial thrust of impeller were obtained and analyzed comparatively.The results shows that the pressure fluctuation in pump is cyclical,and the higher pressure fluctuation intensity occur when β2 are 16° and 20°.The pressure fluctuation in vane and volute are gradually increased with the blade outlet angle increasing,and the intensity in vane is stronger than that in volute,and fluctuation frequency in both vane and volute is blade frequency with different blade outlet angle.The blade outlet angle has certain impact on radial thrust distribution on impellers,the radial thrust of impeller ascend with β2 increasing,and the radial thrust of first impeller is larger than the other impeller,volute has greater improvement on impeller radial thrust than vane.

关键词(KeyWords): 离心泵;数值模拟;叶片出口角;压力脉动;径向力
centrifugal pump;numerical simulation;blade outlet angle;pressure fluctuation;radial thrust

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基金项目(Foundation): 江苏省自然科学基金资助项目(BK20131256);; 江苏省重点研发计划竞争项目(BE2017126)

作者(Author): 张忆宁;曹卫东;姚凌钧;姜昕;
ZHANG Yi-ning;CAO Wei-dong;YAO Ling-jun;JIANG xin;Technical and Research Center of Fluid Machinery Engineering,Jiangsu University;

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