Abstract:In order to study the erosion wear caused by the sprayed particles of the pneumatic blasting gun nozzle, we used the tapered pneumatic blasting nozzle as the research object, and use CFD software to simulate the internal flow field and particle motion characteristics; The shrinkage angle, particle size and particle mass flow rate were further analyzed to affect the variation of nozzle erosion rate. The results show that the erosion area of the nozzle is mainly concentrated at the interface between the shrinkage section and the shrinkage tube and the outlet section. For example, nozzles with shrinkage angles of 30°, 45°, and 60°, as the shrinkage angle increases, the erosion area appears. "Reverse development"; with the increase of particle size, the maximum erosion rate of the nozzle shows a "U"-type change trend of decreasing first and then rising, and the maximum erosion rate of the nozzle with different shrinkage angles is "lag" at the minimum position; With the increase of particle mass flow rate, the maximum erosion rate of the nozzle is increasing, but there is no linear relationship.