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考虑了化学反应及压力梯度力,对等离子喷涂流场分布及颗粒运动特性进行研究。利用Spray Watch-2i对飞行颗粒进行在线监测。结果表明:气流的最高温度为12000 K,最高速度为150 m/s。当载气流量在4 L/min时,颗粒能够很好的加热加速。当送粉流道与射流方向垂直时,颗粒分布在流场外围,而当送粉流道与流场垂直方向倾斜8°夹角后,颗粒的运动轨迹偏向流场中心。当颗粒直径为10μm时,颗粒能够被载气送入到射流中心位置。而当颗粒直径逐渐增大时,颗粒穿过射流中心分布在流场外围。颗粒的最大速度达到270.9 m/s,最大温度达到3939 K。最佳喷涂距离为80 mm。
Considering chemical reaction and pressure gradient force, the flow field distribution and particle motion characteristics of plasma spraying are studied. On-line monitoring of flying particles with Spray Watch-2i. The results show that the maximum temperature of airflow is 12000 K and the maximum speed is 150 m / s. When the carrier gas flow at 4 L / min, the particles can be very good heating acceleration. When the powder feeding flow path is perpendicular to the jet direction, the particles are distributed on the periphery of the flow field. When the angle between the powder feeding flow path and the vertical direction of the flow field is 8 °, the trajectory of the particle is biased toward the center of the flow field. When the particle diameter is 10 μm, the particles can be carried by the carrier gas to the jet center. When the diameter of the particles increases, the particles distribute in the periphery of the flow field through the jet center. The maximum particle velocity reaches 270.9 m / s and the maximum temperature reaches 3939 K. The best spray distance is 80 mm.