离心通风机叶轮的有限元建模与应力分析

Finite Element Modeling and Stress Analysis of Centrifugal Fan Impeller

为了得到结构合理、安全性高的叶轮,分别采用传统手工理论计算和有限元数值分析软件计算2种方法,对9-19-10D型通风机叶轮进行应力计算分析,总结出一种选用板壳单元并利用约束方程将叶片和盘的边界节点进行耦合的有限元建模方法,应力计算分析后可以进一步对已有叶轮结构进行优化。结果表明:采用有限元数值分析方法不仅提高了计算精度,而且可以得到直观的应力分布,便于找到产生应力集中的部位进行优化处理,进一步提高强度。

To get an impeller with reasonable and reliable structure ,stress calculation and analysis was made on 9 -19 -10D fan impeller by the methods of FEMsoftware and general theories.A method of finite element modeling was got that using shell elements to build a FEMmodel and then coupling the contiguous nodes of the blades and the discs.Then the impeller’s structure was optimized after calculation and analysis.The results show that the FEMcalculation can not only improve the accuracy of calculation,but also get stress distribution more directly.So it is convenient to optimize the stress concentration parts to enhance the strength.