affected by particles

The problem of spray quality of nozzle affected by erosion wear can cause the flat-fan spraying were invalid. The solid particles' properties on its motion, the forces, the kinematical velocity and the attack angle of the particles in boundary-layer were discussed. Then the hydraulic abrasion mechanism of the flat-fan spraying nozzles was analyzed. The volume losses of nozzles material relationship was established with the attack angle change of the spherical-top of flat-fan orifices. It was indicated that the attack angle increased with axial size increasing, when axial size of solid particles impact position was less than its critical dimension, on the contrary the attack angle decreased with axial size increasing at fan-shaped spraying nozzle. Wear degree of fan-shaped spraying nozzle increased with axial size of nozzle inner surface increasing. And the most serious wear was in the minor-axis of the spherical-top of flat-fan orifices because the least attack angle. Finally, the theoretical analysis was verified through erosion wear test of the flat-fan spraying nozzles. The results provide a reference for analyzing wear characteristics, calculating wear rate and forecasting erosion loss of the flat-fan nozzles.