Modification and Optimization of Cylindrical Blade of Dredge Pump Based on CFD

Abstract

Abstract The 3500 m3/h series cutter suction dredger pump adopts cylindrical blade impeller with low efficiency and serious wear of impeller channel; The twisted blade is optimized by conformal transformation method, and the blade wrap angle is increased by 75°; The efficiency of dredge pump with twisted blades is increased by 9% compared with cylindrical blades when the flow is 8000-12000 m3/h; The relative velocity nephogram shows that the twisted blade eliminates the vortex in the impeller channel and improves the flow field; Through the erosion simulation analysis of solid-liquid two-phase flow, through the surface equalization treatment of the erosion wear of the impeller wall, it is found that the average wear rate of the twisted blades is 19% lower than that of the cylindrical blades, indicating that the wear resistance of the designed twisted blade impeller has been improved and the service life of the dredge pump has been increased.