Based on the CFD theory,the flow field characteristics of coupled erosion and cavitation wear were numerically simulated in different impact angles( α < 40°),and the simulation results were compared with the experimental results in order to study the failure characteristics of coupled wear of 40 Cr in the low impact angle. The simulation results show: 1) the damage extent of the coupled wear increases first and then drops as the impact angle changes,and the collapse impact pressure of coupled wear reaches a...