大气等离子喷涂流场与粒子特性分析
Analysis of flow field and particle characteristics of atmospheric plasma spraying
张勇 1郭龙龙 1鞠录岩 1吴恒1
作者信息
- 1. 西安石油大学机械工程学院,陕西西安 710000
- 折叠
摘要
实验在考虑了等离子喷涂过程中颗粒所受热泳力和压力梯度力的基础上,对大气等离子喷涂过程中的流场分布以及粒子特性进行研究,得到如下结论:在纯氩工况下,大气等离子喷涂流场最高温度为14 000 K,最高速度为470 m/s.氩氢混合工况下,流场最高温度比纯氩工况下提高了 30％.温度场分布并不是沿Z轴对称,而是呈驼峰分布.载气流量在5 L/min时,颗粒能够被送入等离子体射流中心,获得流场充分的动能和热能.随着载气流量增加,颗粒穿过流场.载气流量为3 L/min时,颗粒在等离子射流体上方飞行,不利于加热加速.纯氩工况下,粒子的最大速度达到271 m/s,最大温度为4 000K.实验工况下的最佳喷涂距离为80 mm.
Abstract
The thermal swimming force and pressure gradient force of particles in the process of plasma spraying were considered,and the flow field distribution and particle characteristics in the process of atmospheric plasma spraying were studied.The results show that in pure argon,the maximum temperature of atmospheric plasma spray-ing flow field is 14 000 K,and the maximum velocity is 470 m/s.The maximum temperature of flow field under ar-gon-hydrogen mixing condition is 30％higher than that under pure argon condition.The temperature field is not symmetrical along the Z axis,but humped.When the carrier gas flow rate is 5 L/min,the particles can be sent into the center of the plasma jet to obtain sufficient kinetic energy and thermal energy of the flow field.With the in-crease of carrier gas flow,particles pass through the flow field.When the carrier gas flow rate is 3 L/min,the parti-cles fly above the plasma fluid,which is not conducive to heating acceleration.In pure argon,the maximum veloci-ty of the particles reaches 271 m/s and the maximum temperature is 4 000 K.In this paper,the optimal spraying dis-tance is 80 mm.
关键词
大气等离子喷涂/射流特性/粒子特性/喷涂距离/载气流量Key words
atmospheric plasma spraying/jet characteristic/particle characteristic/spaying distance/carrier gas flow引用本文复制引用
出版年
2024
NETL
NSTL
万方数据