离心泵叶轮流固耦合分析

Fluid-structure Coupling Analysis of Centrifugal Impeller

基于流固耦合原理对离心泵叶轮进行结构分析,采用多物理场协同仿真平台ANSYS Workbench,基于单向流固耦合技术对离心泵叶轮结构进行了仿真计算,获得了离心泵叶轮在不同工况下的等效应力及变形情况,分析了叶轮最大等效应力和最大总变形随流量的变化情况。结果表明,各工况下叶轮应力分布不均且存在局部应力集中;叶轮变形的总位移随半径的增大不断变大,并在叶轮边缘达到最大值。叶轮最大等效应力随流量的增加不断减小,在0.4倍设计流量工况下最大为10.581MPa;叶轮最大总变形随流量的增加先减小后增大,在设计流量工况下最小为0.0028669mm。计算结果对离心泵叶轮的结构优化设计提供了数值依据。

Analysis of centrifugal impeller structure based on fluid - structure interaction theorem, the equivalent stress and deformation of centrifugal impeller at different operation conditions were obtained through the numerical simulation of centrifugal impeUer structure which was carried out by the multi -physical fields simulation platform--ANSYS Workbench,with one-way fluid- structure interaction technique, then, the characteristics of the largest equivalent stress and total deformation under different flow rate conditions were investigated. The results showed that the stress of impeller was markedly uneven and the local stress concentration appeared in each operation condition. The total displacement of the distortion increased constantly as the radius increasing and it reached the maximum value at the edge of the impeller. The maximal equivalent stress of impeller decreased constantly as the flow rate increasing, and it reached the maximum value of 10.581MPa under the low flow rate condition of 0. 4 times of design discharge; The greatest total deformation decreased first and then increased as the flow rate increasing , and it reached the minimum value of 0.0028669mm at the operation conditions. The results can be used to provide numerical basis for structural optimal design of centrifugal impeller.