变厚度叶片对离心压缩机结构强度和性能影响  

Influence of variable-thickness blade on structural strength and performance of centrifugal compressor

作　　者：孙涛[1] 王毅[1] 王晓放[1] 谢蓉[1] 马震岳[2] 

机构地区：[1]大连理工大学海洋能源利用与节能教育部重点实验室,辽宁大连116024 [2]大连理工大学水利水电工程研究所,辽宁大连116024

出　　处：《大连理工大学学报》2012年第1期29-34,共6页Journal of Dalian University of Technology

基　　金："九七三"国家重点基础研究发展计划资助项目(2009CB724303)

摘　　要：以国内某大流量离心式压缩机首级叶轮为研究对象,采用数值模拟方法研究了变厚度叶片对离心压缩机结构强度和性能的影响.应用CAD软件Solidworks对9种变厚度叶片的闭式叶轮进行三维实体造型,运用有限元软件ANSYS进行静态应力分析,并利用计算流体动力学软件CFX进行叶轮内部流场分析.重点比较分析了叶轮最大von Mises应力的差异,以及叶轮内部流场性能的不同.计算结果表明:叶片厚度分布对离心压缩机的结构强度和性能具有较大影响,且叶片后缘厚度的适当增加可以显著提高压缩机闭式叶轮的结构强度和气动性能.分析结果可为大流量离心压缩机及大型核主泵叶轮结构的优化设计与性能提高提供理论依据.A systematic investigation to understand the impacts of the variable-thickness blade on the structural strength and performance of the first stage impeller for a domestic large flow centrifugal compressor is undertaken.The geometric models of 9 shrouded impellers with variable-thickness blade are mainly established by CAD software Solidworks,static structural analyses are carried out using finite element software ANSYS,and CFD simulations are performed with the CFX code.Emphases are placed on the variation of maximal von Mises stress in FEM analyses,and the distinction of impeller internal flow behavior in CFD simulations.The variable thickness of blade is found to exert the great influence on the structural strength and performance of a centrifugal compressor.Furthermore,the computational results indicate that the appropriate increase of blade thickness close to trailing edge can remarkably improve the strength and aerodynamic characteristics of a shrouded impeller.Finally,the theoretical bases are given for the structural optimization and the performance improvement of a large flow centrifugal compressor and a nuclear reactor coolant cycling pump impellers.

关 键 词：离心压缩机 变厚度叶片 强度与性能 

分 类 号：TH452[机械工程—机械制造及自动化]