Spatial-temporal Evolution of Dielectric Barrier Discharge Filament in Pin-to-plate Geometry at Atmospheric Pressure
李雪辰, 张琦, 楚婧娣, 李霁媛, 贾鹏英
河北大学物理科学与技术学院河北省光电信息材料重点实验室,保定071002
LI Xuechen, ZHANG Qi, CHU Jingdi, LI Jiyuan, JIA Pengying
State Key Laboratory of Photo-electronics Information Materials of Hebei Province, College of Physics Science and Technology, Hebei University, Baoding 071002, China
基金项目:
国家自然科学基金(11575050;
10805013);
河北省自然科学基金(A2015201199;
A2015201092);
Project supported by National Natural Science Foundation of China (11575050, 10805013), Natural Science Foundation of Hebei Province (A2015201199, A2015201092);
In order to analyze the formation mechanism of the dielectric barrier discharge filament in the small gap, the discharge forming process of streamer discharge mechanism was studied by taking volume discharge and surface discharge as the research object. After using a dielectric barrier discharge device in a pin-to-plate geometry, stable discharge was generated in atmospheric pressure argon. It is found that the discharge transits from a mono-filament into a multi-filament with increasing the peak value of the applied voltage. With increasing the peak voltage, the intensity of the total light emission signal from the discharge increases as well as the light pulse number per half voltage cycle. Moreover, the inception voltage in the positive half cycle increases with increasing the argon flow rate, and decreases with increasing the peak value of applied voltage. Temporal evolution of the mono-filament discharge is investigated during one voltage cycle by an high-speed camera with an exposure time of several nanoseconds. It is found that the discharge consists of volume discharge in the air gap between the two electrodes and surface discharges on the dielectric plates. The volume discharge corresponds to a positive streamer mechanism for both the positive and the negative half voltage-cycles, however, the discharge mechanism of the surface discharge is related with the polarity of the electrode. The surface discharge on the instantaneous cathode corresponds to a positive streamer, and a negative streamer mechanism is involved for the surface discharge on the instantaneous anode.
KEY WORDS :atmospheric pressure discharge;dielectric barrier discharge;filamentary discharge;streamer mechanism;spatial and temporal evolution;
图4
正半周期放电起始电压Uin随氩气体积流量\({{q}_{\text{V}}}\)和外加电压峰值Up的变化关系
Fig.4
Inception voltage in the positive half cycle of the applied voltage as a function of the gas flow rate and the peak value of the applied voltage
图5
外加电压正半周期单丝放电沿着轴向的时间演化(曝光时间为20 ns)
Fig.5
Temporal evolution of the mono-filament discharge along the axial direction in the positive half cycle of the applied voltage with an exposure time of 20 ns
图6
外加电压正半周期单丝放电在瞬时阴极端沿着径向的时间演化(曝光时间为20 ns)
Fig.6
Temporal evolution of the mono-filament discharge along the radial direction of the instantaneous cathode in the positive half voltage cycle (exposure time is 20 ns)
图7
外加电压负半周期单丝放电沿着轴向的时间演化(曝光时间为20 ns)
Fig.7
Temporal evolution of the mono-filament discharge along the axial direction in the negative half voltage cycle with an exposure time of 20 ns
图8
外加电压负半周期单丝放电在瞬时阳极端沿着径向的时间演化(曝光时间为20 ns)
Fig.8
Temporal evolution of the mono-filament discharge along the radial direction of the instantaneous anode in the negative half cycle of the applied voltage (the exposure time is 20 ns)
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