Multiple-target optimization method for hydraulic performance and outer field flow-induced noise for centrifugal pump as turbine

The invention belongs to the technical field of design for a centrifugal pump as a turbine and discloses a multiple-target optimization method for hydraulic performance and outer field flow-induced noise for the centrifugal pump as the turbine. The method comprises the following steps: step I, defining a determination method for a multiple-target optimization design variable value range for the centrifugal pump as the turbine; step II: through external characteristic experiment, building a computing method for mechanical efficiency required in CFD numerical calculation for the centrifugal pump as the turbine, so as to accurately calculate the efficiency of the centrifugal pump as the turbine; for different characteristics of the inner and outer media for the centrifugal pump as the turbine, adopting an FEM/AML sound-vibration coupling method for solving outer field flow-induced noise; step III: building sensitivity analysis models of different geometrical parameters for the efficiency of the centrifugal pump as the turbine and the outer field total noise power level; step IV: on the basis of a response surface method, carrying out multiple-target optimization on the hydraulic performance and outer field flow-induced noise. By adopting the method, the design efficiency is improved, the design period for the centrifugal pump as the turbine is shortened, the efficiency of the centrifugal pump as the turbine can be effectively improved and meanwhile, the noise of the centrifugal pump as the turbine can be reduced.