低气压等离子体喷涂引射装置的数值仿真研究  

Numerical Simulation on Low Pressure Plasma Spraying Ejection Device

作　　者：张帆 李平川 简毅 陈思邈 熊思维 叶欣南 王伟 ZHANG Fan;LI Pingchuan;JIAN Yi;CHEN Simiao;XIONG Siwei;YE Xinnan;WANG Wei(Southwestern Institute of Physics,Chengdu 610000,China;China Nuclear Tongchuang(Chengdu)Technology Co.,Ltd.,Chengdu 610207,China;The Engineering&Technological College of Chengdu University of Technology,Leshan 614000,China;China Nuclear Power Engineering Co.,Ltd.,Beijing 100840,China;Hainan Nuclear Power Co.,Ltd.,Haikou 570100,China)

机构地区：[1]核工业西南物理研究院,成都610000 [2]中核同创(成都)科技有限公司,成都610207 [3]成都理工大学工程技术学院,乐山614000 [4]中国核电工程有限公司,北京100840 [5]海南核电有限公司,海口570100

出　　处：《真空科学与技术学报》2023年第4期314-325,共12页Chinese Journal of Vacuum Science and Technology

基　　金：四川省科技成果转移转化示范项目(2021ZHZY0007);2021海南重大科技计划项目(ZDKJ2021056);华龙后续机型集中研发项目(2008-402JZHL-402-2);西物创新行动计划(202103XWCXYD001)。

摘　　要：低气压等离子体喷涂技术在材料表面涂层制备方面具有独特的技术优势,在航空航天、冶金及制造等行业领域具有广泛的应用前景。本文采用在等离子体喷枪外部加装引射装置方式进行粉末注入的设计,针对该技术应用中提升高熔点材料粉末加热雾化效果的问题,通过数值仿真计算的手段,分析了引射装置结构、粉末注入位置及粉末注入方向等因素对粉末颗粒加热雾化效果的影响。主要结论如下:加装引射装置进行粉末注入有利于提升粉末颗粒的加热和雾化效果;拉瓦尔喷管形式的引射装置有利于进一步提升粉末颗粒的加热雾化效果,但存在一定的粉末堵塞风险,扩张型喷管引射装置可以有效降低粉末堵塞风险,但粉末温度及整体加热雾化效果还需进一步优化。Low pressure plasma spraying technology has unique technical advantages in the preparation of material surface coating and has a wide application prospect in industries such as aerospace,metallurgy,manufacturing,and so on.In this paper,an ejector device is installed on the outside of the plasma spray gun for powder injection.Aiming at improving the heating atomization effect of the powder with high melting point in the application of this technology,the influences of the structure of the ejector device,the position of powder injection,and the direction of powder injection on the heating atomization effect of powder particles are analyzed by means of numerical simulation.The main conclusions are as follows:installing an ejector device for powder injection is beneficial to improve the heating and atomization effect of powder particles.And Laval nozzle-type ejection device is beneficial to further improve the heating atomization effect of powder particles,but there is a certain risk of powder clogging.The expanded nozzle-type ejection device can effectively reduce the powder clogging risk,but the powder temperature and the overall heating atomization effect need to be further optimized.

关 键 词：等离子体喷涂 引射装置 装置结构 粉末注入 粉末颗粒温度 

分 类 号：O53[理学—等离子体物理]