【摘要】 为提高沿面介质阻挡放电等离子体激励器放电强度及其流动控制能力,通过光电测量的方法,研究了引入氩气气流以后,空气沿面介质阻挡放电等离子体放电参数的变化以及氮分子的激发和电离过程。结果表明,氩气引入之后,放电强度和均匀性明显增加,产生了稳定的大面积均匀放电等离子体,"温升效应"明显,有利于增加动量传递效率,提高气流诱导速度。空间测量结果表明:谱线强度、气体温度在中心处最强,且随着到极板边缘距离的减少而减弱;N2(C3Πu)振动温度的变化与气体温度相反。另外,随着氩气流量增加,放电强度先增加后减弱,气体温度升高,加入氩气之后N2(C3Πu)振动温度下降,之后随流量增加先增加后减小并趋于稳定,电子激发温度受流量影响较小。更多还原

【Abstract】 The effect of argon flow on the air surface dielectric barrier discharge at atmospheric pressure was experimentally investigated and discussed with the purpose to strengthen the discharge and its flow control ability. The plasma discharge characteristics and the mechanisms of excitation and ionization processes of nitrogen molecules have been discussed in this mixture. It is shown that a stable large-volume plasma is developed with higher discharge intensity and uniformity. Thermal effect of the plasma is evident. It is beneficial for the increase of the momentum transfer efficiency and the induced velocity by using argon-induced discharge. The spatial distribution results shows that the intensity of the spectral lines and the gas temperature have the maximum value at the central position and decrease along the electrode on both sides, however, variations of the N2(C3Πu) vibrational temperature are just contrary. In addition, as the argon flow increases, the discharge intensity increases firstly then reduces, while the gas temperature increases. N2(C3Πu) vibrational temperature decreases after the addition of argon flow. And it increases at first, then decreases and tends to stability at last with increasing flow rate. There is almost no influence of flow rate on electronic excitation temperature.更多还原