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| Spatio-Temporal Evolution of Air Plasma Plume Driven with a Direct-Current Voltage at Atmospheric Pressure |
| HAN Yu-hong1, JIA Peng-ying1*, HE Shou-jie1, BAO Wen-ting1, ZHAO Zheng2 |
1. College of Physics Science & Technology, Hebei University, Baoding 071002, China
2. Hebei Environmental Monitoring Center, Shijiazhuang 050037，China |
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Abstract Using a plasma jet to compose two needle electrodes, a brush-shaped plasma plume is generated at atmospheric pressure with ambient air used as working gas. Although a direct-current power supply is used, the discharge shows a pulsed characteristic. The emission pulse frequency keeps constant with changing the gas flow rate, but it increases with the increasing of the output power. The length of the plasma plume increases with the increasing of the gas flow rate and the output power. According to the spatially resolved measurement of light emission (O Ⅰ, 777.4 nm), the emission profile is non-symmetric near the outlet. The intensity near the cathode is greater than that near the anode. It tends to be near-symmetric with the location away from the outlet. The plume is analyzed in terms of sustaining voltage, evolution of current, light emission and fast photography of 10 μs. It can be found that the brush-shaped plume is actually a temporal superposition of moving arched discharge filament. As it moves away from the channel outlet, the discharge evolves from arc-shaped filament into a normal glow in one discharge cycle.
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Received: 2016-04-06
Accepted: 2016-10-27
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Corresponding Authors:
JIA Peng-ying
E-mail: jiapengying@hbu.edu.cn
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