气体流速对大气压氩气等离子体射流影响的实验与仿真  

Experimental and Simulation Research on the Influence of Gas Flow Rate on Ar APPJ

作　　者：邵先军[1] 张冠军[1] 詹江杨[1] 李娅西[1] 张增辉[1] 彭兆裕[1] 

机构地区：[1]西安交通大学电力设备电气绝缘国家重点实验室,西安710049

出　　处：《高电压技术》2011年第6期1499-1504,共6页High Voltage Engineering

基　　金：国家优秀博士论文基金(200338);中央高校基本科研业务费专项资金项目(xjj20100160)~~

摘　　要：为了研究气体流速对Ar大气压等离子体射流(APPJ)的影响,首先对其进行了实验研究,并通过建立二维轴对称模型,数值仿真了Ar气流在空气中的流速与摩尔分数分布。考虑了高流速下湍流对APPJ的影响,耦合求解了连续性方程、N-S方程、K-ε湍流方程以及混合气体的组分输运方程。实验结果表明,随Ar流速的变化APPJ表现为层流、过渡态和湍流3种模式,当流动为过渡态时APPJ长度为最长。仿真结果表明,当流动处于层流时,随着流速的增加,径向的Ar速度与摩尔分数逐渐增大,这与APPJ长度随Ar流速逐渐变长的实验结果相符合;当流动处于湍流时,Ar的径向扩散陡然上升,Ar头部的摩尔分数下降,这也与实验中观察到的当Ar流速很大时射流长度反而变短的现象基本相符合。The influence of gas flow rate on Ar atmospheric pressure plasma jet（APPJ） was experimentally researched.Furthermore,the distributions of velocity and concentration of Ar flow in ambient air were simulated numerically by a two-dimensional axis-symmetrical model of plasma jet.The continuity equation,N-S equations,K-ε turbulence equation and species transport equation of mixture gas were coupled together and solved.The experimental results show that,the Ar APPJ with the variation of gas flow rate can be divided into three patterns： laminar flow,transition status,and turbulent flow.The APPJ length is longest under transition status.The numerical simulation results reveal that,when the flow is laminar,the radial Ar velocity and molar concentration of APPJ components begin to increase,which agrees with experimental results that the APPJ length is lengthened with the increment of flow rates.When the flow is turbulent,the radial diffusion of Ar rises suddenly and the molar concentration of APPJ head decreases,which is also consistent with the observed experimental phenomena that the jet length turns to short at a high Ar flow rate.

关 键 词：大气压等离子体射流(APPJ) 氩气等离子体 射流长度 氩气摩尔分数 数值仿真 湍流模型 

分 类 号：O53[理学—等离子体物理]