基于流固耦合的高温泵叶轮应力有限元分析

Finite element analysis of high temperature pump impeller stress based on fluid-solid coupling

根据高温泵零件二维图,应用Pro/E软件对高温泵内叶轮结构模型及整机水体模型进行实体建模,采用CFX软件对高温泵内部流场进行数值模拟,分析了泵内部的压力随不同工况的变化情况,基于流固耦合利用Ansys软件对叶轮施加静力载荷,进行应力应变分析,揭示了整个叶轮的变形情况及应力分布.结果表明:首级结构的对称性使其变形较为均匀,应力应变分布较为规律;水泵叶片根部两侧存在明显的集中应力,并且应力逐渐向叶片外侧扩散,叶片外缘所受到的应力值很小,应力集中点为次级叶片与轮毂相交处靠近进口的位置;在不同工况下叶轮最大静应力随着高温泵轴功率的增大而降低,且线性关系较差.

According to 2-D map of high temperature pump,the main parts of high temperature pump were modeled by Pro/E software.The fluid field of high temperature pump was numerically simulated by CFX program to obtain the pressure change at different work conditions.Based on fluid-solid coupling,stress-strain was analyzed by Ansys program at static load to investigate the deformation and stress distribution of impeller.The results show that the deformation and the distribution of stress-strain become uniform due to the symmetry of first stage.The obvious stress concentration can be found at the blade root,and diffuses to the blade outside with the increase of blade radius.The minimum stress is near to the outer margin of blade.The position of stress concentration is close to the intersection of secondary blade and hub.The maximum static stress on impeller decreases with the increase of shaft power,but with poor linear relationship.