大气等离子喷涂流场特性及颗粒流动特性  

Flow field characteristics and particle flow characteristics of atmospheric plasma spraying

作　　者：张勇[1] 郭龙龙 鞠录岩 吴恒[1] ZHANG Yong;GUO Longlong;JU Luyan;WU Heng(College of Mechanical Engineering,Xi'an petroleum university,Xi'an,710000,China)

机构地区：[1]西安石油大学机械工程学院,陕西西安710000

出　　处：《粉末冶金工业》2022年第5期12-18,共7页Powder Metallurgy Industry

摘　　要：利用数值分析结合实验的方法研究大气等离子喷涂流场特性及颗粒流动特性。结果显示,氩氢混合气情况下的喷涂温度比纯氩提高了约30%。当喷涂距离小于70 mm时,颗粒温度速度低于主气,颗粒处于加热加速过程。当喷涂距离为70~90 mm时,颗粒的温度速度达到最高,接近于主气。当喷涂距离大于90 mm时,主气温度速度低于颗粒,颗粒处于降温降速过程。实验结果表明,颗粒速度和温度的计算值和实验值具有相同的变化趋势,在距喷嘴70~90 mm处达到最大值,验证了数值计算结果的准确性。当主气流量一定时,射流体的温度和速度随着电流功率的增大而增大。流体速度随主气流量的增加而增加,流场温度随主气流量的增加而降低。Numerical analysis combined with experimental research method has been used to study the flow field characteristics and particle flow characteristics of atmospheric.The results show that the spraying temperature of argon hydrogen mixture is higher than that of pure argon about 30%.Particles temperature and velocity are lower than those of the main gas when spraying distance is less than 70 mm,so particles are in the process of heating speed up.Particles temperature and velocity are reached the highest,close to the main gas when spraying distance is between 70-90 mm.Main gas temperature and velocity are lower than those of particles when spraying distance is greater than 90 mm,so particles are in the process of cooling speed down.The experimental results show that the particle velocity and temperature calculation value and experimental value have the same change trend,verifying the accuracy of the results of numerical calculation.Flow field temperature and velocity increases with the increase of main gas when the main gas flow is constant.Fluid velocity increases with the increase of the main gas.Flow field temperature decreases with the increase of the main gas.

关 键 词：大气等离子喷涂 流场特性 颗粒流动特性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]