CAJ | 학술논문

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。
위료연구기체류속대Ar대기압등리자체사류（APPJ）적영향,수선대기진행료실험연구,병통과건립이유축대칭모형,수치방진료Ar기류재공기중적류속여마이분수분포。고필료고류속하단류대APPJ적영향,우합구해료련속성방정、N-S방정、K-ε단류방정이급혼합기체적조분수운방정。실험결과표명,수Ar류속적변화APPJ표현위층류、과도태화단류3충모식,당류동위과도태시APPJ장도위최장。방진결과표명,당류동처우층류시,수착류속적증가,경향적Ar속도여마이분수축점증대,저여APPJ장도수Ar류속축점변장적실험결과상부합;당류동처우단류시,Ar적경향확산두연상승,Ar두부적마이분수하강,저야여실험중관찰도적당Ar류속흔대시사류장도반이변단적현상기본상부합。
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.