CAJ | 학술논문

利用同轴介质阻挡放电喷枪，通过氩气的流动在大气压空气中产生了均匀的等离子体羽。等离子体羽沿气流方向较为均匀，但在喷嘴处为白色且亮度较高，远离喷嘴处为蓝色，亮度较低。研究了等离子体羽长度与外加电压幅值、驱动频率和气体流速的关系，气流小于4 L·min-1时等离子羽的长度随气流的增大而增大，而当气流大于4 L·min-1时长度随气流的增大而减小。当气流保持恒定时，等离子体羽的长度随外加电压幅值或驱动频率的增大而增大。结合气体放电理论以及分析湍流和平流对放电的影响，对等离子体羽长度随实验参数的变化进行了定性解释。光学方法研究发现在外加电压正半周期等离子羽有一个发光脉冲，而负半周期没有发光信号。同轴介质阻挡放电正半周期有两个发光脉冲，负半周期有一个发光脉冲。通过对该N2现象的分析，为等离子体羽的产生机制提供了一种可能的解释。采集了同轴介质阻挡放电和等离子体羽的发射光谱，研究发现除等离子体羽存在明显的OH 和N2的发射谱线外，其发射光谱没有明显差别。利用光学发射谱N＋2第一负带系，对等离子体羽转动温度进行了测量，发现转动温度沿远离喷嘴的方向逐渐降低，且转动温度随电压幅值的增大而增大。
이용동축개질조당방전분창，통과아기적류동재대기압공기중산생료균균적등리자체우。등리자체우연기류방향교위균균，단재분취처위백색차량도교고，원리분취처위람색，량도교저。연구료등리자체우장도여외가전압폭치、구동빈솔화기체류속적관계，기류소우4 L·min-1시등리자우적장도수기류적증대이증대，이당기류대우4 L·min-1시장도수기류적증대이감소。당기류보지항정시，등리자체우적장도수외가전압폭치혹구동빈솔적증대이증대。결합기체방전이론이급분석단류화평류대방전적영향，대등리자체우장도수실험삼수적변화진행료정성해석。광학방법연구발현재외가전압정반주기등리자우유일개발광맥충，이부반주기몰유발광신호。동축개질조당방전정반주기유량개발광맥충，부반주기유일개발광맥충。통과대해N2현상적분석，위등리자체우적산생궤제제공료일충가능적해석。채집료동축개질조당방전화등리자체우적발사광보，연구발현제등리자체우존재명현적OH 화N2적발사보선외，기발사광보몰유명현차별。이용광학발사보N＋2제일부대계，대등리자체우전동온도진행료측량，발현전동온도연원리분취적방향축점강저，차전동온도수전압폭치적증대이증대。
A uniform plasma plume was generated in a coaxial dielectric barrier discharge j et through blowing argon into the am-bient air at atmospheric pressure.The plasma plume was uniform along the direction of the gas flow.The length of the plasma plume was investigated as a function of the peak voltage,the driving frequency and the gas flow rate.It was found that with in-creasing the gas flow rate,the plume length increases when the flow rate is lower than 4 L·min-1 ,and decreases when it is higher than 4 L·min-1 .Under constant gas flow rate,the length of the plasma plume increases with the increase in the peak value of the applied voltage and the driving frequency.According to the discharge theory and based on the analysis of the turbu-lence and the advection,a qualitative explanation was given for the variance of plume length as functions of the experimental pa-rameters.Results also show that there is a discharge pulse for the plasma plume in every positive half cycle,while there is no pulse in negative half cycle.The coaxial dielectric barrier discharge shows two pulses in every positive half cycle and a pulse in every negative half cycle.Analyzing these experimental phenomena mentioned above,a formation mechanism of the plasma plume was proposed.The optical emission spectra were obtained for both the coaxial dielectric barrier discharge and the plasma plume.There was no apparent difference except that some emission lines from reactive species such as OH and N2 were found in the plasma plume.Using the first negative band of,the rational temperature of the plasma plume was measured.Results show that the rational temperature of the plasma plume decreases away from the jet nozzle,and increases with increasing the peak val-ue of the applied voltage.