An Analysis of Impeller Strength and Fatigue Life of Centrifugal Pump Based on Fluid-Structure Interaction Low Specific Speed.

Considering the real stress and deformation state of impeller during the operation of centrifugal pump, the fluid-structure coupling numerical simulation of impeller of centrifugal pump model was carried out based on the software platform of Ansys Workbench and the computational fluid dynamics analysis software CFX. The strength of impeller of centrifugal pump under the combined action of centrifugal force and CFD pressure load was calculated. The position of the maximum stress on the impeller under the action of cyclic alternating stress during rotation is determined. Finally, nCode Designlife software was used to predict the fatigue life of the impeller. The results show that the maximum stress is located at the interface between the blade outlet edge and the cover plate, and the cyclic cyclic stress is the main cause of the fatigue damage of the impeller. The impeller meets the design of infinite life fatigue strength, and the impeller has no risk of fatigue failure. [ABSTRACT FROM AUTHOR]