基于同轴直管和倒置锥形管的氩大气压等离子体射流放电形态的实验和仿真  

Experiment and Simulation on the Discharge Modality of Atmospheric Pressure Plasma Jets in Argon Based on Coaxial Straight Tube and Inverted Tapered Tube

作　　者：任富强[1] 汲胜昌[1] 祝令瑜[1] 郝致远[2] 陆伟峰[1] 李熙宁 Ren Fuqiang;Ji Shengchang;Zhu Lingyu;Hao Zhiyuan;Lu weifeng;Li Xining(State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong University Xi’an 710049 China;DC Technology Consultancy Centre of State Power Economic Research Institute Beijing 102209 China)

机构地区：[1]电力设备电气绝缘国家重点实验室(西安交通大学),西安710049 [2]国网北京经济技术研究院直流技术咨询中心,北京102209

出　　处：《电工技术学报》2017年第8期95-102,共8页Transactions of China Electrotechnical Society

摘　　要：为了研究同轴直管和倒置锥形管对氩气大气压等离子体射流(APPJ)放电形态的影响,首先进行实验,并通过建立二维轴对称模型,耦合求解连续性方程、Navier-Stokes方程、k-ε湍流方程和粒子质量输运方程,数值仿真两种管体中的氩气流的摩尔分数分布。相关结果表明,层流状态下,直管中的放电沿着管壁发展且不稳定;倒置锥形管中放电稳定,且集中在管体轴部。在层流状态下,与传统的同轴直管相比,采用锥管能够改善氩气流场分布,管体内存在较低氩气摩尔分数形成的薄层,阻碍了沿面放电的发生,保证了放电的稳定性。而湍流状态下,由于径向扩散效应,两管体中氩气摩尔分数分布差异变小,等离子体放电的形态差异不大。In this paper,the Ar atmospheric pressure plasma jet(APPJ)generated with coaxialstraight tube and inverted tapered tube was experimentally investigated at first,and then the Ar molefraction distribution inside both tubes was simulated numerically with two-dimensionalaxis-symmetrical models.The continuity equation,Navier-Stokes equations,k-εturbulence equationand species mass transportation equation were coupled and solved.The results showed that,in laminarflow,the discharge developed along the inner wall of straight tube unsteadily,but along the central axisof tapered tube stably.Compared with straight tube,the tapered tube could improve Ar mole fractiondistribution in laminar flow.A thin layer,composed of air and argon with low fraction,hindered thedischarge along the inner surface,which maintained the stability of the discharge.While the argon wasin turbulent flow,due to radial diffusion,the Ar mole fraction distributions inside both tubes wereidentical,and thus the discharge differed little.

关 键 词：大气压等离子体 射流倒置锥形管 数值仿真 摩尔分数 

分 类 号：TM213[一般工业技术—材料科学与工程]