基于流固耦合的闭式离心叶轮结构强度分析

Structural Strength Analysis of Closed Centrifugal Impeller Based on Fluid-structure Interaction

分别采用CFX计算出三种工况下叶轮的气动压力分布,利用ANSYS计算出只受离心力载荷作用时的叶轮应力和变形。通过单向耦合得到两种载荷共同作用时的应力、变形结果,最后对叶轮进行了强度校核。结果表明,最大等效应力发生在叶片前缘与轮盖交接处,最大变形发生在叶轮出口处。叶轮的应力主要受离心力载荷的影响,而受气动载荷的影响较小。随着流量增加,最大等效应力和最大变形量随之减小。强度校核表明叶轮满足要求。文中为叶轮的流固耦合的强度计算提供了一种参考,从仿真角度揭示了叶轮的应力分布,为理论分析提供了佐证。

This paper uses CFX to calculate the aerodynamic pressure distribution of the impeller under three working conditions,and uses ANSYS to calculate the impeller stress and deformation when only the centrifugal force is applied.Through the one-way coupling,the stress and deformation results when the two loads work together are obtained,and finally the strength of the impeller is checked.The results show that the maximum equivalent stress occurs at the intersection of the leading edge of the blade and the wheel cover,and the maximum deformation occurs at the exit of the impeller.The stress of the impeller is mainly affected by the centrifugal load and is less affected by the aerodynamic load.As the flow rate increases,the maximum equivalent stress and the maximum deformation decrease.The strength check indicates that the impeller meets the requirements.This paper provides a reference for the strength calculation of the fluid-structure interaction of the impeller.The stress distribution of the impeller is revealed from the simulation point,which provides evidence for theoretical analysis.