Abstract：The doublevolute was adopted to reduce the radial force that is inherent in singlevolute centrifugal pumps.The hydraulic performance and radial force on the impeller in a doublevolute centrifugal pump were estimated numerically based on a threedimensional,steady and turbulent flow model.Due to the poorly designed splitter,the pump head and efficiency were relatively decreased by 21.8％and 41.3％ respectively at the design point,comparing with the pump without splitter in the volute.In order to restore the performance,the splitter was optimized by approach of CFD and orthogonal experimental design techniques.Three factors,including starting circumferential angle and radius as well as length of free part of splitter were involved in the optimization process.The design cases were determined by the orthogonal experiment L4(23) table at the two levels of those factors,subsequently,they were analyzed using a CFD code to obtain their effects on the performance of the pump.The optimum design of splitter was achieved as the result of orthogonal experiment.According to the CFD predictions and testing results of the optimized design,the radial force has been reduced by about half and the hydraulic performance has kept nearly unchanged compared with the pump without splitter in the volute.
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