大气压下氮气介质阻挡微放电中分子振动温度的时间分辨

Temporal evolution of molecular vibrational temperature in filamentary dielectric barrier discharge in nitrogen at atmospheric pressure

使用针-板式电极装置,在大气压氮气介质阻挡微放电中,通过对氮分子第二正带系（C3Πu→B3Πg）发射光谱的时间分辨谱线进行分析,根据振动带序发射光谱强度计算得出N2（C,ν）振动温度,并研究了不同压强及放电电压对氮分子（C3Πu）的振动温度时间分辨的影响。实验结果表明：氮分子振动温度的范围为2 000~3 500 K,在每半个放电周期内都呈减小趋势,且正负半周期振动温度差较大,负半周期振动温度始终高于正半周期;振动温度随电压升高而升高,随压强的升高而降低。

The experiment of filamentary dielectric barrier discharge（DBD） in nitrogen at atmospheric pressure has been studied,in which the needle-plate reactor was employed.The temporal evolution of vibrational temperature of the N2（C3Πu→B3Πg） molecules was successfully recorded by optical emission spectrometry.And the N2 vibrational temperature was calculated at the different discharge voltage and pressure.The experiment results show that the molecular vibrational temperature of N2 ranges from 2 000 K to 3 500 K.It reduces with increasing time in both positive and negative semi-cycles of discharge,and it is always higher in the negative semi-cycle.The vibrational temperature rises with increasing discharge voltage and reduces with increasing pressure.