Abstract：An automatic optimization method for centrifugal impeller shapes was established with FORTRAN program, in which the impeller meridian plane and blade profile were parameterized according to the theory of stream surface and coordinate transformation, genetic algorithm was improved via adaptation strategy to increase algorithm efficiency. CFD software NUMECA was used to simulate the 3D steady internal flow in impellers, diffusers, and other main hydraulic components of pumps to predict the hydraulic performance. Taking the pump performance parameters of efficiency and head as the optimization multi-objectives, the impeller structures of Dn1000 oil submerged pump and IS80-65-125 clean water pump were optimized. The performance of the optimized pumps is improved obviously. Under the design condition, the two pumps′head increases by 0.21 m and 1.70 m, and the efficiency increases by 1.9% and 2.3%, respectively.
