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Multi-parameter Optimization and Analysis on Performance of a Mixed Flow Pump
Author(s): Xianfang Wu, Xiao Tian, MInggao Tan, Houlin Liu
Keywords: Energy characteristics; Mixed flow pump; Multi-island GA; Optimization design;
A mixed flow pump with guide vanes is chosen as research model in this study, and eight parameters of the impeller are selected as optimization variables, including blade outlet inclination angle, blade wrap angle at hub, blade inlet angle and outlet angle at middle stream line, blade outlet width, front shroud inclination angle, hub inclination angle and vane number. Firstly, orthogonal experimental method and CFD numerical simulation method are used to produce samples, then the RBF neural network is adopted to establish the performance prediction model as the objective function, multi-island genetic algorithm is used for solving the objective function at last. Based on all the above, a method of multi-parameter optimization method on energy performance of mixed flow pump without changing the nominal diameter of impeller outlet is proposed and then verified by experiments. By this method, the pump head and efficiency at the design point of the model pump are increased by 11.5% and 4.32%, respectively. And the peak value of pressure pulsation coefficient at pump inlet, impeller outlet, guide vane outlet and pump outlet all decreased obviously, by a maximum decrease of 62.9%. Besides, the turbulent energy intensity at the impeller outlet is reduced successively, and the pressure gradient in impeller and guide vane become much more uniform.