【摘要】 建立了一套交流放电产生N2等离子体喷束的装置,该装置可对氮气进行高达15 kV连续放电。采用浓度调制光谱技术对放电辉光光谱进行探测,并对实验中放电电流和光谱信号的关系进行了讨论。沿着束流的轴向探测了不同位置N2等离子体的发射光谱,发现其激发态振动温度随着束流的下降先降低继而升高,并根据实验条件分析了其变化规律和产生机理。研究了束流中N2+/N2比例变化过程,发现随着束流向下两者比例逐渐升高,并结合实验装置进行讨论。更多还原

【Abstract】 N2 plasma jet was generated from a nozzle using an AC discharge at about 15 kV.The emission spectra were obtained by using the concentration modulation spectroscopic technique.The dependence of spectral signal on the discharge current was discussed.It was found that the vibrational temperature decreased first and then increased downstream from the nozzle by measuring the emission spectra from different axial positions in the jet.A phenomenological model was presented to explain the vibrational temperature variation with different axial position z.The N+2/ N2 ratio varied along the axis and the property of discharge in the experimental system was studied.更多还原