A single-stage low specific speed centrifugal pump was studied based on the Euler equation and Stodola method on the platform of Fluent considering the inlet prewhirl by using radial inlet guide vanes to study the influence of prewhirl on pump performance. The effect of prewhirl flow on non-overload performance of a centrifugal pump was analyzed through the internal flow field and external chara-cteristic obtained from the numerical simulation of three schemes with different geometric parameters of inlet guide vanes. The results shows: the circumferential velocity at the exit of guide vanes increases with the enhancement of the inlet prewhirl. According to the internal flow field from inside to outside along the radial direction, the circumferential velocity shows the increasing trend and slightly reduces along flow direction without considering the effect of boundary which is different with VuR=constant. Sharp down head curves and flat power curves can be obtained by the enhancement of the inlet prewhirl flow and the efficiency is improved slightly near the region from small flow rate to rated flow. Therefore, it is possible to realize the non-overload performance in the total head range by using prewhirl flow.
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