Abstract:To investigate the sediment wear characteristics of large axialflow pump,the internal flow law and wear mechanism of sediment in axial flow pump were studied,using the inhomogeneous model,Particle model and Tabakoff wear model and slip wall boundary conditions.The results show that the sediment volume fraction,the wear rate of the head and the pressure face of blade are the largest,which will lead to larger wearing speed of the blade face compared with the suction face,and the most significant wear damage in the inlet head.The particle size has a significant effect on the trajectory of sediment,but the change in sediment concentration has little effect on the trajectory of sediment.As particle size grows,the movement velocity of the sediment in the impeller is increased,and its movement towards the blade pressure face becomes more obvious.The wear rate is increased with the increasing of sediment particle size.Particle size is a major factor affecting sediment trajectory,and sediment concentration is a secondary factor.As the particle size of the sediment increases,the wear rate is increased and the wear strength is increased accordingly.As the sediment concentration increases,the wear rate is increased throughout the impeller.It is indicated that both particle size and sediment concentration are important factors in accelerating the wear of axialflow pumps.