轴伸贯流泵叶轮叶片应力改善有限元分析  

A Finite Element Analysis of Improving Stress State for Shaft-extension Tubular Pump Impeller Blades

作　　者：陈荣杰[1] 阚阚 覃颖聪 张新[4] 贾少华[1] 

机构地区：[1]河海大学能源与电气学院,南京211100 [2]河海大学水利水电学院,南京210098 [3]河海大学商学院,南京211100 [4]中国电建集团华东勘测设计研究院有限公司,杭州311122

出　　处：《中国农村水利水电》2017年第1期185-188,193,共5页China Rural Water and Hydropower

基　　金：国家自然科学基金项目(51579080);安徽省自然科学基金(1608085ME119);中央高校基本科研业务费专项资金(2015B33814)

摘　　要：为计算分析轴伸贯流泵叶轮叶片根部加厚后的应力分布情况,采用计算流体力学软件CFX,基于雷诺时均N-S方程和SST k-ω湍流模型对某轴深贯流泵装置全流道三维定常不可压湍流流场设计工况进行了数值模拟。借助ansys workbench平台,将稳态流场数值模拟所得叶片表面静压力作为叶片有限元计算的载荷边界条件,得到四种根部不同加厚厚度的叶片在设计工况下的等效应力与总变形分布。研究结果表明:通过出对叶片根部应力集中区域的加厚,可以缓解此处应力集中并减小最大等效应力,从而抑制和预防叶片根部裂纹的产生。而叶片根部的加厚对叶轮叶片总变形并无太大影响,同时提出了一种叶轮叶片根部连接叶片轴处的加厚方法。研究结果为同类型水泵叶轮结构设优化计和安全稳定性研究提供参考。In order to analyze the distribution of stress of shaft-extension tubular type pump blade root after it is thickened,numerical simulation of three-dimensional steady incompressible turbulent flow fields through a shaft-extension tubular type pump was conducted on the basis of Reynolds Equations closed by SST k-ω turbulence model with general coordinates by using computational fluid dynamics software CFX.With the help of ansys workbench platform and taking static pressure on blade surfaces gained from numerical simulation of turbulent flow fields as load boundary conditions of the blade finite element calculation,the equivalent stress and the distribution of total deformation of four kinds of different degree of thickening of blades under design conditions.The results show that by thickening the area of stress concentration on blade root,the stress concentration can be eased and the maximum equal stress can be reduced in these areas so as to suppress and prevention the occurrence of cracks at the roots of blades.However,the thickened blade root has no effect on the total deformation of impeller blades.At the same time,a method of thickening the connecting part of impeller blade roots and shafts is proposed.The result of this study serves as the reference for the structural design optimization and safety stability study of the same-type pump impeller.

关 键 词：轴伸贯流泵 叶轮叶片 根部加厚 等效应力 应力改善 

分 类 号：TV675[水利工程—水利水电工程] TV533