The performance of centrifugal pumps can be improved through filing blade outlet when the head is slightly lower than the actual demand.After filing the impeller of a single-stage single-suction centrifugal pump, the head and efficiency rise by 9.8% and 6.7% respectively. The unsteady nume-rical simulation of whole flow field of the pump was executed at design condition with CFX software, and the change of the flow field was analyzed. Based on ANSYS Workbench, the one-way fluid-structure interaction of impeller was calculated and the effect of filing blade outlet on impeller strength was analyzed. Results show that, the increase of absolute velocity and the decrease of relative velocity can make the head increased after filing. The adverse pressure gradient on blade outlet edge with filed blades decreases obviously, preventing the separation of boundary layer. The losses of friction and se-paration are decreased, so the efficiency is improved. Impeller maximum equivalent stress changes with the phase after filing blade outlet. But the impeller maximum total deformation is greater than original impeller at every phase.The research provides a reliable method for improving flow field of centrifugal pump.
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