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As one of the important auxiliary parts of centrifugal pump, inducer plays an important role in improving the cavitation performance of pump. Aiming at the problem of poor cavitation performance of a high flow centrifugal pump, the parameters of the inducer of the pump were optimized by means of response surface analysis and numerical simulation. The influence of the lead of inducer, blade thickness and blade number on the cavitation performance of high-flow centrifugal pump was investigated. Firstly, the simulation model of large flow centrifugal pump was constructed to calculate the external characteristics, and the reliability of the simulation results was verified by comparing with the experimental results. Then, according to the law of positive correlation between inducer head and pump cavitation performance, taking inducer blade parameters (lead L, thickness T, blade number Z) as variable factors, the maximum inducer head is the optimization target, the response surface of the inducer was calculated and analyzed. The parameters of the inducer blade after response surface optimization were obtained, and the head of the inducer before and after optimization was compared. Finally, the impeller cavitation nd critical net positive suction head (NPSH) of the centrifugal pump before and after the optimization of the inducer were compared under different working conditions. The results show that the blade guide has a little influence on the inducer head, but decreasing blade thickness and increasing blade number can improve inducer head. Under rated working conditions, the inducer head is increased by 0.6 m, and the critical NPSH of the pump is reduced by 0. 15 m compared with the prototype pump after the response surface optimization, which provides a theoretical reference for the optimal design of the inducer of the high flow centrifugal pump. [ABSTRACT FROM AUTHOR]

In terms of the problems in traditional teaching situation of hydraulic and pneumatic transmission course, the project-based teaching innovation is carried out in this paper. Several new teaching methods arc developed, including the construction of dimensional teaching resources, introduction of FluidSIM simulation system, implementation of typieal-eomponents-based scene practical teaching and modular project-based teaching methods. Moreover, the course evaluation system is modified for the; project-based teaching method, itineludes in-group evaluation, inter-group evaluation, and teacher evaluation. In general, the; course innovation stimulates the students’ study interest and strengths the; students’ practice ability, team awareness, and innovative spirit. [ABSTRACT FROM AUTHOR]