Abstract：In order to improve the overall efficiency of a low specific speed centrifugal pump at multi-operation point, the hydraulic performance of such a pump is optimized numerically across a flow rate ratio of 8(the maximum flow rate to the minimum one)by making use of a global optimization algorithm based on Latin hypercube sampling and simulated annealing algorithm. Three optimization schemes are exploited, i.e. impeller optimization, volute optimization, and overall(impeller plus volute)optimization. It is shown that the efficiency of the optimized pumps becomes better in all the optimization schemes. The efficiency of the optimized pump in the volute optimization scheme is quit close to that in the overall optimization. However, the improvement of efficiency in the impeller optimization scheme is less than that in the other schemes. Thus, when a centrifugal pump with low specific speed is optimized at variable operation points, the first priority is to conduct a volute optimization. Moreover, in order to improve the overall efficiency of a centrifugal pump at multi-operation point, the design flow rate should be slightly lower than the maximum operation flow rate.
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