Optimization for S-type Blade of Fire Pump Based on Response Surface Method

The design optimization method for variable curvature blade of fire pump is established,based on experimental design theory and response surface approximation.The objective functions are defined as the maximum efficient,high effective area and stability of head-flow curve in the small flow region.Through taking a single-stage single suction centrifugal pump MY56-50 as the initial model and by using Bezier parameter curve fitting blade surfaces,the model of blade profile parameters are gotten.First a significant impact on the blade profile parameters are filtered out by single factor experimental design,and then the filter parameters of the optimal design point are analyzed and determined by the central composite design and response surface methodology.According the results by computational fluid dynamics(CFD) calculated,the variable curvature blade profile control parameters and objective function response surface approximation model are constructed,and the interaction effects between the parameters are analyzed.Experimental study on the optimal design point of the pump,CFD calculated values are consistent with the approximation of the response surface,and the new pump than the pump of MY56-50 have greatly improved in performance.It indicated that the optimal design method based on the experimental design and response surface can be used for optimized the design of variable curvature blade of fire pump.