Two sets of inlet guide vanes with different airfoil sections were designed for the preswirl regulation in a centrifugal pump by using the basic design theory of turbomachinery to optimize its operation conditions.Subsequently, effects of positive preswirl induced by the guide vanes with different airfoils on the hydrodynamic performance of the centrifugal pump were studied. The result showed that an appropriately designed positive preswirl could increase the efficiency of the singlesuction centrifugal pump.Compared with the performance without the inlet guide vanes, the efficiency of the centrifugal pump installed the inlet guide vanes with straight constantthickness could be increased as high as 2.05% and the responding shaftpower consumption could be reduced as low as 6.35%. For the guide vanes with Gottingen364 airfoils, the efficiency of the pump was increased by 2.34% and the reduction in shaftpower consumption was lowered by 6.53%.The inlet guide vanes with both straight constantthickness blade and Gottingen airfoil showed little influence on the head. For the straight constantthickness blade, the best efficiency point was moved to a low flow rate 172 m3/h at the 20° and 40° preswirl angles; for the Gottingen airfoil, the best efficiency point was changed to 172 m3/h as well; however, the best efficiency occurred at 190 m3/h at the 40° preswirl angle.Clearly, the high efficiency range has been extended at the 20° and 40° preswirl angles for the inlet guide vanes with Gottingen airfoil.
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