Abstract:The principle of artillery reverse recoil device and the mechanism of erosion wear were analyzed,and the simplified twodimensional modelwas built up,according to the actual architectural feature of a recoil mechanism of artillery.The features of the complex flow field in the process of recoil motion were numerical simulated combined with the discrete phase model (DPM) and the RNG kε turbulence model by computational fluid dynamics software FLUENT.The internal chamber pressure,velocity and the eddy viscosity charts and the erosion particle trajectories were obtained.The results from indirect calculation verify that this numerical simulation method can really describe internal complex liquidsolid twophase flow field of recoil machine,which provides a valid reference for the erosion wear analysis and structure optimization design of the recoil mechanism.