四电极装置产生片状氩气等离子体羽的特性

doi:10.3969/j.issn.1000-1565.2021.03.005

摘要/Abstract

摘要： 利用四电极结构的介质阻挡放电(DBD)装置,在大气压环境中,产生了一个弥散的氩气等离子体羽.结果表明:随着交流电压峰值和氩气流量的增大,等离子体羽的长度变长,且在此过程中氩原子谱线强度也增大.电压电流波形表明放电既可以出现在电压的上升沿也可以出现在其下降沿.利用高速摄像不断缩短曝光时间,发现正负放电存在明显差别.正放电对应分叉的放电丝,而负放电却是均匀弥散的.实际上,正放电的分叉丝和负放电的弥散背景分别对应着正流光放电和负流光放电.讨论了分叉丝及弥散背景的形成机制.这些研究结果对于大尺度等离子体羽的产生及流光动力学行为的深入研究具有重要意义.

关键词: 等离子体羽, 高速影像, 流光机制, 电荷溢流效应

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

中图分类号:

O461.2

宋彩虹,武珈存,吴凯玥,贾鹏英,冉俊霞,杨丽君. 四电极装置产生片状氩气等离子体羽的特性[J]. 河北大学学报(自然科学版), 2021, 41(3): 251-257.

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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