Three-point hydraulic optimization of impeller meridional plane for centrifugal pumps

In light of the fact that the design of meridional plane of impellers directly influences the efficiency of centrifugal pumps,a three-point hydraulic optimum design method of impeller meridional plane for centrifugal pumps was presented.The shroud arc radius,shroud angle,hub arc radius,and hub angle of the double-arc meridional plane were selected as the design variables,and the maximum of the weighted average hydraulic efficiency in the three operation conditions was chosen as the objective function.Simulation optimization of the impeller meridional plane was automated numerically by using Isight integrated Pro/E,Gambit and Fluent software.The super-transitive approximation method was applied to fix optimal weight factors of three individual objective functions.The optimal Latin hypercube experimental design method was used to produce data samples.The hydraulic performance of a centrifugal pump with a specific speed of 84.8 at 0.8,1.0,1.2 times of the design flow rate was optimized using the method.The results show that the weighted average hydraulic efficiency in the three operation conditions improves by 1.42 percentage points.Therefore,the three-point hydraulic optimum design of impeller meridional plane for centrifugal pumps is feasible.