冲压焊接离心泵叶轮有限元计算  

Finite element computation for impeller of stamping and welding centrifugal pump

作　　者：王洋[1] 王洪玉[1] 徐小敏[1] 张翔[1] 

机构地区：[1]江苏大学流体机械工程技术研究中心,江苏镇江212013

出　　处：《排灌机械工程学报》2011年第2期109-113,共5页Journal of Drainage and Irrigation Machinery Engineering

基　　金：'十一五'国家科技支撑计划项目(2008BAF34B15);江苏省科技服务计划项目(BM2008375)

摘　　要：为计算叶轮的应力及变形情况,在ANSYS软件中采用流固耦合方法将流场计算得到的分布压力施加到叶轮结构上,对冲压焊接离心泵叶轮进行有限元分析.首先对不同网格密度的叶轮模型进行计算,在此基础上,分别计算了设计工况下叶轮在离心载荷、流场压力载荷及两者共同作用下的等效应力及变形情况,并分析了叶轮最大应力及最大总变形随流量的变化情况.结果表明:离心载荷引起的应力及变形明显小于流场压力载荷引起的应力及变形.叶轮在流场中的应力及变形主要由流场压力载荷引起,但在考虑离心载荷后叶轮的最大应力和变形均略有增大.各种载荷作用下叶轮的等效应力在小流量工况下最大,随流量的增大不断减小.叶轮的最大总变形在小流量工况下最大,随流量的增大先减小后增大,在最高效率工况下出现最小值.In order to calculate the stress and deformation of an impeller,the finite element analysis was carried out for a stamping and welding centrifugal pump impeller in ANSYS with fluid-structure interaction（FSI） method.The fluid pressure load distribution on impeller surfaces was obtained first by computational fluid dynamics（CFD） method and then was exerted on impeller structural model.Firstly,the sensitivity of the impeller model with different mesh density was analyzed.Then,the equivalent stress and total deformation of the impeller were calculated under three action conditions of centrifugal inertia force,fluid pressure load and the coupling of the two kinds of loads,respectively.In addition,the characteristics of the largest stress and total deformation under different flow rate conditions were investigated.The results show that the stress and deformation induced by centrifugal inertial load are much less than that caused by fluid pressure load.The stress and deformation of impeller are mainly caused by the fluid pressure load,while there are slightly increases for stress and deformation after the inertial load being involved.The maximal stress of calculated impeller under all kinds of loads shows the largest value appears at low flow rate condition,and decreases continuously as the flow rate increasing.The greatest total deformation shows the maximum value appears at low flow rate condition,and increases first and then decreases with the increasing of the flow rate,and reaches its minimum value at the best efficiency point.

关 键 词：离心泵 叶轮 冲压焊接 有限元分析 

分 类 号：S277.9[农业科学—农业水土工程] TH311[农业科学—农业工程]