针-环式大气压Ar冷等离子体射流的放电特性  

Discharge characteristics of cold atmospheric Ar plasma jet with needle-ring electrode

作　　者：潘静[1] 洪义[1] 王菊霞[1] 

机构地区：[1]渭南师范学院物理与电气工程学院,陕西渭南714000

出　　处：《物理实验》2012年第11期13-18,共6页Physics Experimentation

基　　金：渭南师范学院研究生专项资助项目(No.07YKZ061;07YKZ060);陕西省自然科学基金资助项目(No.SJ08A25)

摘　　要：利用针-环式电极实现了大气压Ar冷等离子体射流.通过等效电路计算得到高压电极与石英玻璃管内壁之间气隙处的传导电流,计算出了峰值电压6.2kV时43.8μs时刻的电场绝对值的1维和2维分布.结果表明:43.8μs时刻接地电极边缘处电场最大,针尖处不会出现放电现象,并且针管内电场为零.发射光谱测量发现激发态的Ar,OH,O,N2等存在于等离子体射流中.模拟氮分子第二正带系C3∏u→B3∏g(Δν=-2)的跃迁光谱与实验测得光谱相比较,得到了针尖下方5mm处的气体温度为357K,振动温度为1 349K,利用玻尔兹曼分布法得到电子激发温度为3 221K.Cold atmospheric Ar plasma jet was generated with needle-ring electrode.The conduction current in the gas gap between high voltage electrode and inner wall of quartz glass tube was calculated by equivalent circuit,and the 1D curve and 2D distribution map of electric field were calculated with applied voltage of 6.2 kV at 43.8 μs.It was found that at 43.8 μs,the highest electric field appeared at the edge of the ground electrode and the discharge could not take place on the needle tip and the electric field within the needle tube was zero.The optical emission spectra indicated that the excited Ar,OH,O,N2 species existed in the Ar plasma plume.The gas and vibrational temperature at the position 5 mm away from the needle tip were determined by comparing the simulated spectra of the C3∏u→B3∏g（Δν=-2） transition of nitrogen with the measured spectra,which corresponded to 357 K and 1 349 K,and the electronic excitation temperature was determined to be 3 221 K by the Boltzmann plot method.

关 键 词：针-环式电极 等效电路 电场绝对值 气体温度 电子激发温度 

分 类 号：O53[理学—等离子体物理]