Abstract An optimization method for the hydraulic design of centrifugal pumps at multioperation points was proposed by means of a global optimization algorithm and a computational model for estimating hydraulic losses and energy performance of centrifugal pumps.In the method,the values of several key geometric parameters in an original design were used as the initial conditions,and the design head was considered as a constraint condition,and the weighted average shaftpower at multiple operation conditions was chosen as the objective function.The adaptive simulated annealing algorithm was used to solve the model of hydraulic losses and energy performance.Additionally,the supertransitive approximation method was applied to update optimal weighted coefficients in the objective function.A centrifugal pump with a special speed of 129.3 was optimized with the method.The CFD numerical simulations were done for the original design and the optimized one,respectively.It was shown that the shaftpower of the optimized case is less,but the head is higher than the original design at 0.6Qd and 1.2Qd.The weighted average shaftpower optimized is decreased by 0.06%,but the weighted average efficiency rises by 0.46% compared with the original design.The results could be really useful to design an energysaving centrifugal pump.
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