(西安交通大学 机械学院， 西安 710049)
摘 要: 运用流体力学、传热学以及相变等理论，建立数学模型描述金属液滴与气流的相互作用，计算了金属液滴的飞行速度和温度衰减过程。结果表明：金属液滴飞行速度、温度以及凝固程度是金属液滴直径、飞行距离的函数；金属射流中固态金属颗粒比例是金属射流中金属液滴质量分布的函数；飞行距离600mm以内，固态、半固态金属颗粒所占比例不超过2%。
关键字: 电弧喷涂； 速度； 温度； 数值计算
（School of Mechanical Engineering， Xi′an Jiaotong University，
Xi′an 710049, P.R.China）
Abstract: An integral model for arc spray Zn-Al droplets in flight was developed using established theoretical principles of fluid mechanics， heat transmission and phase transformation. Mathematical models describe the interconnected processes of droplet-gas interactions in flight. The calculation result of Zn-Al droplets velocity and temperature shows that droplets velocity and temperature are function of flight distance and droplets diameter. Percentage of solid droplets in metal spray is a function of droplets size distribution. In flight distance(<600mm)， depending on size and cooling rate， the droplets in metal spray are completely liquid， partially solidified， or completely solidified，the percentage of partially solidified， or completely solidified in metal spray do not exceed 2%.
Key words: arc spray; velocity; temperature; numerical analysis
