The governing equations of the motion of fluid, computational scheme and procedure are introduced in regard to the quasi-three-dimensional inverse design method for blade of centrifugal pump impeller based on relative flow stream surface S{sub}(2m) (bound vortex sheet). The flows of water in two centrifugal pump impellers, which had been investigated by using LDV, are calculated by using this method in direct problem mode and the accuracy of this method is less than 15%. The algorithm for the inverse design problem is convergent, and the convergent speed is very quick through the true design of impellers of centrifugal pumps of type IS80-65-160. The impeller of centrifugal oil pump of type 65Y60 is also designed by using this method. The experimental results of this pump show that the efficiency of the redesigned impeller is higher by 2%～4% than that of original one designed by using the one-dimensional design theory for blade for the same pump. The quasi-three-dimensional inverse design method for blade may be applied into the impeller design of the centrifugal pumps or centrifugal oil pumps to improve the performance and save energy as well.
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