超音速电弧喷涂粒子速度的计算机仿真

粒子速度对涂层质量有重要的影响，计算机仿真是确定粒子运动规律的有效方法。通过建立数学模型，对超音速电弧喷涂纯铝的粒子速度进行了仿真计算，结果表明，粒子飞行过程中经历了一个加速减速的过程，直径40μm的粒子最大速度为365m／s，最大速度点离喷嘴出口52mm，试验测得的粒子最大速度为386m/s，位置在喷嘴出口40～60mm范围内。仿真计算反映了射流中粒子的运动特征，从理论上证明超音速电弧喷涂的粒子速度超过音速。

Computer Simulation of Particle Velocity of Supersonic Arc Spraying

Particle velocity shows an importanteffect on the quality of thermal spray coating. Thecomputer simulation is an effective way todetermine particle velocity. Through establishing amathematical model, the particle velocity of pureAluminium in arc spraying was simulated. Thecalculation results showed that particles experienced an acceleration-deceleration process.Particles with diameter of 40 μm reached themaximum velocity of 365m/s at a distance of 52mmfrom the nozzle exit. Experiment results showedthat the maximum velocity of particle was 386m/sat the distance ranged from 40 to 60mm from the nozzle exit. Simulation basically reflected the ruleof flying of particles, and proved that the particlevelocity of supersonic arc spraying is greater thanthe velocity of sound.