等离子喷涂熔滴扁平过程数值模拟

Numerical Simulations of Droplet Flattening in Plasma Spraying

采用 Ｐ Ｈ Ｏ Ｅ Ｎ Ｉ Ｃ Ｓ 流体动力学计算软件，结合 Ｍａｒｋｅｒ＿ Ａｎｄ＿ Ｃｅｌｌ 技术，模拟研究了等离子喷涂熔滴碰撞基体后的扁平过程。结果表明，熔滴沿基体表面的最大铺展速度主要和碰撞速度有关；初始碰撞压力与熔滴的密度及碰撞速度的平方成正比；熔滴的扁平率随熔滴的密度和碰撞速度的增大而增大。

Droplet flattening after impact on flat substrate in plasma spraying is numerically studied by using PHOENICS code and Marker_And_Cell technique. The results show that the peak velocity of droplet flow along substrate surface after impact is mainly affected by impact velocity. The initial impact pressure is directly proportional to droplet density and square impact velocity. The flattening degree grows with the increase of droplet density and impact velocity.