流动氩气放电系统中条纹斑图形成的实验研究

采用双水电极介质阻挡放电装置, 在大气压下流动氩气中产生了稳定的条纹斑图, 并采用拍照和电学方法对其产生机理进行了研究. 研究发现, 条纹斑图仅出现在外加电压较低的情况下, 在较高电压下放电会过渡到均匀模式. 低电压下的条纹斑图是由于放电丝沿着气流方向定向移动形成的, 该定向移动速度几乎与电压无关, 主要由气体流量决定. 分析发现放电空间中活性粒子的记忆效应对条纹斑图的形成起决定作用. 电学测量发现放电电流和放电的气隙起始电压都随着气流的增加而减小, 本文对这一现象进行了定性解释. 本文结果对斑图动力学研究和介质阻挡放电的工业应用都具有很重要的意义.

Experimental investigation on the formation of stripe pattern in flowing argon discharge system

Stable stripe pattern is observed in flowing argon at atmospheric pressure by using a dielectric barrier discharge device with two transparent water electrodes. Based on the photography and the electrical measurement, the formation mechanism of stripe is investigated. Results show that a stripe pattern can be obtained at a lower peak value of the applied voltage in flowing argon, and the discharge turns homogeneous at a higher voltage. Results show that the formation of stripe pattern results from the movement of discharge filament in the direction of gas flow. The moving velocity of filaments almost keeps constant during the voltage varying. However, the moving velocity increases with the increase of gas flow rate. The memory effect of active particles in the discharge space is very important for the formation of stripe pattern. Furthermore, the electric characteristics of discharge are studied in flowing gas in this paper. It is found that both the discharge current and the gas inception voltage decrease with the increase of the gas flow rate. A qualitative explanation is given for this experimental phenomenon. These results are of great importance for the research of pattern formation dynamics and industrial applications of dielectric barrier discharge.