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通过在冷喷涂条件下对喷枪内部流场进行数值模拟,得到气相流场中温度场、压力场和速度场分布,给出了气固两相流场中颗粒相轨道化描述。结果表明:气体温度和气体压力在喷管中先升高后降低,气体速度在喷管中持续升高,颗粒温度和速度表现出与气体良好的跟随性,先急剧升高后稳定升高,故适当提高气体预热温度能更好地提高颗粒的入射速度和得到较高的沉积率。
The temperature field, pressure field and velocity field distribution in the gas flow field are obtained by numerical simulation of the flow field inside the spray gun under the condition of cold spraying, and the particle orbitalization in the gas-solid two-phase flow field is given. The results show that gas temperature and gas pressure first increase and then decrease in the nozzle, gas velocity continues to increase in the nozzle, the particle temperature and velocity show a good followability with the gas, the first sharp rise after a steady rise, Therefore, properly increasing the gas preheating temperature can better improve the particle incident speed and get a higher deposition rate.