Effect of particle diameter on wear characteristics of impeller and space guide vane of mixed-flow pump
LIU Xin1, LI Yibin1*, MA Wensheng2, YANG Youchao2, CHANG Jieyuan1
1. College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2. National Enterprise Technology Center, Chongqing Pump Industry Co., Ltd., Chongqing 400033, China
Abstract：In order to explore the effect of particle diameter on the wear characteristics of the impeller and space guide vanes of the mixed-flow pump, based on the particle orbit model, the RNG k-ε turbulent model and the Tabakoff wear model were used to carry out numerical calculation of the solid-liquid two-phase flow wear of the mixed-flow pump. The particle trajectories, particle shear stress on the surface, wear cloud diagram and average wear rate distribution in the impeller and space guide vane regions under different particle diameters were comparatively compared. The results show that the blade inlet, the connection between the blade and the hub cover, the connection between the guide vane and the outer wall, the head of the working face, and the outlet area of the back face are the most prone locations to wear. As the particle diameter increases, the running trajectories of particles in the impeller and space guide vane become more compact, and the particle trajectory in the impeller area gradually approaches the working surface of the blade from the backside of the blade. The particles in the space guide vane area mainly run along the back surface in the rear section of the guide vane, and mainly along the backside of the guide vane in the back part of the guide vane. At the same time, the larger the diameter of the particles, the greater the shear stress on the wall surface, the larger the wear area of the blades and guide vanes, the higher the average wear rate, and the blades and guide vanes have the largest increase, indicating that the blades and guide vanes are the most vulnerable parts to wear damage. By comparison the average wear rates caused by the three kinds of particles, it is found that the average wear rate caused by particles with a diameter of 3 mm is 2 to 3 orders of magnitude greater than that of particles with a diameter of 0.1 mm.
刘欣,黎义斌*,马文生,杨由超,常杰元. 颗粒直径对混流泵叶轮及空间导叶磨损特性的影响[J]. 排灌机械工程学报, 2023, 41(12): 1196-1202.
LIU Xin,LI Yibin*,MA Wensheng,YANG Youchao,CHANG Jieyuan. Effect of particle diameter on wear characteristics of impeller and space guide vane of mixed-flow pump. Journal of Drainage and Irrigation Machinery Engin, 2023, 41(12): 1196-1202.
