Abstract：In order to improve the recovery efficiency of the seawater desalination energy recovery turbine in the reverse osmosis seawater desalination system. The hydraulic model of turbine impeller was optimized, and the influence law of the interaction on turbine impeller geometric parameters its performance was analyzed, and the geometric parameters of turbine impeller with best performance were obtained. The inlet angle, outlet angle and number of blades were taken as test factors,turbine head and hydraulic efficiency were taken as test indexes. The multiple parameter combination numerical calculation of turbine was carried out based on the BBD test design method, and the response surface analysis method was used to process and analyze the test data. The regression equation between test factors and test indexes was established. The results show that when the inlet angle of turbine blade is 28.8°, the outlet angle is 23.3°, and the number of blades is 7, the hydraulic performance of the turbine is the best. Under design condition, the head of the optimized turbine is 6 m higher than that of the prototype, and the efficiency of the optimized turbine is 0.8% higher than that of the prototype. The number of blades has a great influence on the turbine head and efficiency. The blade number has significant effect on the turbine performance. The contribution rate of blade outlet angle to turbine head is larger than that of blade inlet angle, and the contribution rate of blade inlet angle to turbine efficiency is greater than that of blade outlet angle.
