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为考察溶液注入热等离子体喷涂过程中喷雾参数对涂层质量的影响,本文建立了溶液液滴在热等离子体中运动蒸发的数学模型。模拟了液滴在不同参数下的运动和蒸发的过程,考虑了液滴、热等离子气流及液滴表面气体混合物随温度及组分的物性变化以及斯蒂芬流的影响,得到液滴的运动轨迹,蒸发速率以及半径和表面温度的变化。结果表明在一定范围内增大液滴的尺寸或提高入射速度,使液滴获得较大的初始动量,可使液滴进入射流高温区得到充分加热强化蒸发。
In order to investigate the effect of spray parameters on the coating quality during thermal plasma spraying, a mathematical model of the kinetic evaporation of solution droplets in thermal plasma was established. The movement and evaporation process of droplets under different parameters were simulated. The movement trajectories of droplets were obtained by considering the change of temperature and the physical properties of droplet, hot plasma and the gas mixture on the droplet surface, Evaporation rate as well as changes in radius and surface temperature. The results show that increasing the size of the droplet or increasing the incident velocity within a certain range can make the droplet obtain a larger initial momentum, which can make the droplet enter the high temperature region of jet to be fully heated and intensified to evaporate.