Abstract: Traditional one-dimensional beam theory is difficult to optimize the blade number of highpower mining hydraulic coupling.Aiming at this problem, a response surface model blade number optimization design method based on computational fluid dynamics (CFD) was proposed. Firstly, three-dimensional numerical simulation of the coupling was studied, and the blade number of impeller was designed by using the Optimal Latin hypercube method. Then, the numerical simulation of single channel flow field with different numbers of impeller blades was completed, the sensitivity analysis of blade number of turbine and pump wheel was analyzed, the relationship between impeller blade number and rated torque was determined by establishing response surface approximate model, and the optimization design of blade number was realized. Finally, the distribution law of flow field and torque characteristics was explored. The results show that the rated torque value is the maximum when turbine blade number is zT = 37 and pump blade number is zP = 34, and the response surface model error is only 0.93%. The flow field distribution characteristics reasonably explain the influence rule of impeller blade number on torque characteristics. The optimized impeller blade number can effectively improves the coupling performance at rated working conditions, and provides a reliable method for coupling optimization design and improvement.

Key words: scraper conveyor; mechanical transmission system; internal flow field characteristics; number of impeller leaves; torque characteristics