Finite element computation for impeller of axial-flow pump based on fluid-structure interaction

Abstract

In order to calculate the stress and deformation of the axial impeller, A combined calculation for flow field and structural response of the blades were established using singal-way coupling method. The finite element analysis was carried out for an axial-flow pump impeller using software CFX and ANSYS in the Workbench platform. For the calculation, the flow field is based on Reynolds-averaging N-S equations and two equation Strand k-∊ turbulent model, and the structure response is based on elastic structural dynamic equation. Then, the stress and deformation of the impeller were calculated under three action conditions of inertia load, fluid pressure load and the coupling of the two kinds of loads respectively. Analysised the influence on stress and total deformation under different flow rate. The results indicate that the stress and deformation of the impeller are mainly affected by fluid pressure load; The maximum displacement occurred in the blade inlet at the rim; The contact points of blade root and hub near the inlet side appear obvious stress concentration; The maximum equivalent stress and maximum deformation decreases with the increase of flow rate.