Abstract：Six impeller hydraulic parameters with obvious effects on the performance,β2, b2, D2, Z, D0 and φ were analyzed for an automobile cooling pump with specific speed ns=59, and an auxiliary factor e was also considered. According to the original values, two sets of parameters were designed, and two levels were chosen. According to the orthogonal table L8(27)designed, eight design schemes of impeller were obtained. Steady simulations of the flow in the pump was carried out by Ansys-CFX12.1. Taking head and efficiency at design point as performance target as well as flow rate, head and efficiency at best efficiency point, based on range analysis and comparative analysis of inner flow, the impeller parameters were optimized. The calculated and experimental performance results have been obtained for both the optimized and the original impellers. The results show that the optimized impeller improves the hydraulic efficiency of the pump, and the high efficiency range is widen when more flat head curve can be obtained. The discussion shows that orthogonal method on the pump design is feasible and the numerical simulation is reliable. The combined design method will improve pump performance conveniently, and testing pump performance on the basis will shorten development period and improve work efficiency.
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