When centrifugal pump runs deviated from the design condition, it will increase energy consumption but reduce the efficiency. To optimize the running condition, according to the basic theory of turbomachinery design and inlet guide vanes prewhirl regulation, two different airfoils inlet guide vanes of prewhirl device were designed. Positive prewhirl guide vanes with different airfoils have been studied to determine their hydrodynamic effect on centrifugal pumps. The result shows a single-suction centrifugal pump, appropriate design of positive prewhirl could increase the efficiency of centrifugal pumps. Compared with the performance of the centrifugal pump without inlet guide vane, the efficiency of straight blade-type centrifugal pump could mostly increase 2.05% and the reduction in power consumption could reach the maximum of 6.35%. For Gottingen bowed blade-type, the efficiency of centrifugal pump could mostly increase 2.34% and the reduction in power con-sumption could reach the maximum of 6.53%. Both types have little influence on the head. For straight blade-type, the best efficiency point changed then obtained at Q=172 m3/h. For Gottingen bowed blade-type with 20° prewhirl, the best efficiency point changed then obtained at Q=172 m3/h. Besides the best efficiency point will obtained at Q=190 m3/h when its prewhirl was 40°. The high efficiency scopes of both prewhirl were extended.
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