Discharge characteristics of a planar argon plasma plume generated by a quadri-electrode discharge device

doi:10.3969/j.issn.1000-1565.2021.03.005

Abstract

Abstract: A diffuse argon plume at atmospheric pressure is generated downstream of a longitudinal slit jet equipped with a dielectric barrier discharge(DBD)in a quadri-electrode configuration. Results indicate that both the plume length and the spectral line intensities increase with the increase in the peak voltage. Waveforms of applied voltage and discharge current indicate that discharges can appear in both the rising and falling edges of the applied voltage. By fast photography, it is found that there is a clear difference for discharges with different polarities. The positive discharge is composed of non-uniform branching filaments. As a comparison, it is fairly uniform for the negative discharge. In fact, the positive discharge and the negative one correspond to a cathode-directed streamer and an anode-directed streamer, respectively. The mechanism of branching filaments and dispersion background are discussed in the paper. These results are thought to be of great significance for the deep understanding of the large-scale plasma plume generation and the streamer dynamics.

Key words: plasma plume, fast photography, streamer mechanism, charge overflow effect

CLC Number:

O461.2

SONG Caihong, WU Jiacun, WU Kaiyue, JIA Pengying, RAN Junxia, YANG Lijun. Discharge characteristics of a planar argon plasma plume generated by a quadri-electrode discharge device[J]. Journal of Hebei University(Natural Science Edition), 2021, 41(3): 251-257.

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