刘栋,倪子建,黄凯,王卫华,严建华
LIU Dong,NI Zijian,HUANG Kai,WANG Weihua,YAN Jianhua

• 1:江苏大学能源与动力工程学院
• 2:江苏双达泵业股份有限公司

摘要(Abstract)：

为研究叶轮几何参数对离心泵叶轮磨损特性的影响，采用CFD-DEM耦合方法计算了离心泵的内固液两相流动及颗粒对叶轮的磨损。采用响应面方法，以效率和平均磨损率为优化目标，完成了叶轮的优化设计。结果表明：叶片出口安放角、进口安放角和包角显著影响了离心泵叶轮的磨损特性。出口安放角为27°时磨损最严重，继续增大出口安放角，叶片吸力面中间位置和压力面出口位置磨损明显改善；随着进口安放角的增大，叶片的磨损严重区域从吸力面中间部位向进口方向延伸；随着包角增大，磨损严重区域向叶片中间部位偏移；优化后的离心泵扬程效率均有提升，叶轮磨损严重区域的最大平均磨损率从9.7×10~(-9) kg/s降低到6.5×10~(-9) kg/s，叶轮的抗磨损性能明显改善。
In order to research the influences of impeller geometry parameters on the wear characteristics of centrifugal pump impeller，CFD-DEM(Computational Fluid Dynamics-Discrete Element Method) coupling method was used to calculate the solid-liquid two-phase flow in centrifugal pump and the wear of particles on impeller.The response surface method was used to establish mathematical models of optimization objectives in terms of efficiency and average wear rate，and the optimal design of impeller was completed.The results show that the blade outlet angle，inlet angle and wrap angle significantly affect the wear characteristics of centrifugal pump impeller.The impeller is most severely worn when the outlet angle is 27°.When the outlet anglecontinues to increase，the wear of the middle position of the suction surface and the outlet position of the pressure surface of the blade is significantly improved.With the increase of the inlet angle，the severe wear area of the blade extends from the middle part of the suction surface to the inlet direction.With the increase of the wrap angle，the severe wear area shifts to the middle part of the blade.Both the head and efficiency of the optimized centrifugal pump are improved，the maximum average wear rate of the impeller in the severe wear area is reduced from 9.7×10~(-9) kg/s to 6.5×10~(-9) kg/s，and the wear resistance of the impeller is significantly improved.

关键词(KeyWords)： 离心泵;离散元模型;磨损;固液两相流;数值模拟
centrifugal pump;DEM;erosion;solid-liquid two-phase flow;numerical simulation

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目(51676086);; 江苏省政策引导类计划项目(BZ2020078)

作者(Author): 刘栋,倪子建,黄凯,王卫华,严建华
LIU Dong,NI Zijian,HUANG Kai,WANG Weihua,YAN Jianhua

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