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Abstract In order to calculate the stress and deformation of an impeller, the finite element analysis was carried out for a stamping and welding centrifugal pump impeller in ANSYS with fluid structure interaction(FSI) method. The fluid pressure load distribution on impeller surfaces was obtained first by computational fluid dynamics(CFD) method and then was exerted on impeller structural model. Firstly,the sensitivity of the impeller model with different mesh density was analyzed. Then, the equivalent stress and total deformation of the impeller were calculated under three action conditions of centrifugal inertia force, fluid pressure load and the coupling of the two kinds of loads, respectively. In addition, the characteristics of the largest stress and total deformation under different flow rate conditions were investigated. The results show that the stress and deformation induced by centrifugal inertial load are much less than that caused by fluid pressure load. The stress and deformation of impeller are mainly caused by the fluid pressure load, while there are slightly increases for stress and deformation after the inertial load being involved. The maximal stress of calculated impeller under all kinds of loads shows the largest value appears at low flow rate condition, and decreases continuously as the flow rate increasing. The greatest total deformation shows the maximum value appears at low flow rate condition, and increases first and then decreases with the increasing of the flow rate, and reaches its minimum value at the best efficiency point.
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Received: 26 July 2010
Published: 30 March 2011
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