超音速火焰喷涂Ni粒子特性数值仿真

在超音速火焰流场数值模型的基础上，应用离散惰性粒子模型和粒子追踪法，建立了三维分析模型，对超音速火焰（SO/AF)喷涂粒子速度特性和温度特性进行了数值模拟。研究了不同参数状态下粒子的动态行为以及直径对火焰流速度和温度的影响，揭示了超音速火焰喷涂粒子的速度和温度变化规律。数值结果表明：在SOF、SO-AF、SAF3种工作状态下，粒子的出枪速度和温度依次下降，粒子加速出枪以后，还将在一定距离内加速加温；随着粒子直径的增加，粒子速度、温度梯度均减小。该项研究对制备优质涂层具有重要意义。

Dynamic Simulation of Ni Particle Behaviors in Supersonic Oxygen/Air Fuel Spray Process

Using a dispersive particle model and a particle tracking technology,a three-dimensional computational particle model on supersonic oxygen/air fuel(SO/AF) spray was constructed and the processes of particle acceleration and calefaction were simulated.The result shows particle velocity and temperature laws in SO/AF spray process.At the muzzle,particle behaviors and the influence of particle size on particle velocity and temperature were analyzed at SOF,SO-AF,and SAF. Repeating with different grain size calculation,the results indicate that particle velocity and temperature decrease with the increment of gas initial parameters and particle size.The process plays an important part in spraying high quality coat.