The full flow numerical simulation was carried out with Fluent software to predict the pump performance. The modification efforts on IS65-40-200 centrifugal pump were proposed to analyze the method of the modification and change law of centrifugal pumps with double curvature blades. The short blade′s effect on centrifugal pump with double curvature blade was analyzed. Head is much higher as short blade added, and efficiency is almost the same. By contrasting different models′ performance with different changing proportion, the best proportion was founded. The method used to design centrifugal pumps with double curvature blades is proposed: A centrifugal pump is designed firstly with the best efficiency point at lower flow rate point and then is modified. A double curvature centrifugal pump is designed and tested, and the results validate the method. It is proved that the radial size of centrifugal pump with double curvature blade is smaller than the normal one of common design as well as the axial force.
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