大气条件下厘米级棒-板间隙负极性电晕放电中流注的产生与发展机制

doi:10.19595/j.cnki.1000-6753.tces.222186

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摘要

该文研究了大气条件下棒-板间隙中流注放电的产生与发展机理。首先,基于Raether判据和Meek判据,建立了在给定放电条件下流注的发展长度与由电子球表面电场表示的空间电场强度之间的关系,可用其判断流注放电的发展过程;然后,建立了流注放电的等离子体化学反应仿真模型,分析了流注放电发展过程中带电粒子、平均电子能量以及场强的分布规律;最后,开展了大气条件下负直流棒-板放电实验,分析了流注型电晕放电的发展过程。研究表明,等离子体化学反应模型用于计算厘米级间隙的流注放电的可靠性较高,放电初期以氮气和氧气的电离反应为主,且只有主放电通道的电子崩在放电中期发展为流注,而放电后期负离子层变厚形成鞘层。实验结果表明,流注型电晕由流注和漫射辉光区域组成,且流注的形状、位置随加压时间发生变化,负离子层的积聚是漫射辉光区域形成的主要原因。该文所得结论可对明确负极性电晕放电中流注放电的产生与发展机制,以及等离子体的制备等提供理论依据。

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关键词 ：流注型电晕, 辉光放电, Raether判据, Meek判据, 离子鞘, 棒-板间隙

Abstract：

The genesis and development mechanisms of streamers during centimeter gap corona discharge should be thoroughly studied in order to increase the DC transmission system's dependability and plasma output on a commercial scale. Few investigations have been done so far on the streamer discharge in the centimeter-level air gap. Using atmospheric circumstances and an 18 cm rod-plate gap, a simulation model of the plasma chemistry of streamer discharge is built in this article. To check the accuracy of this simulation model, an experimental platform is being developed.
Both the Raether and the Meek criteria are predicated on the uniform field, making them inappropriate for determining the flow discharge start at the bar-plate electrode. And the photoelectric ionization criteria is a mathematical model that is based on the highly theoretical flow formation process. Quantitatively solving the model is challenging due to the complexity of the various variable values. The flow is therefore assumed to begin when the electron density exceeds 10¹⁸ 1/m³ in this research based on the experience of flow modeling.
This work examines the distribution and development law of charged particles, average electron energy, and electric field intensity in the growth of streamer discharge based on the simulation results. The findings demonstrate that high-energy electrons are mostly present in the head of the streamer, where their ionization reaction leads in a significant production of positive ions, which distorts the spatial electric field. As a result, both the distribution of the spatial electric field and the average electron energy are compatible with the distribution of electron density.
The maximum development length x of the streamer and the electric field intensity Es at the head of the streamer under a very uneven electric field are determined in this work using the Raether and Meek criterion as inspirations. The findings indicate that the length of the streamer is less than 6 cm when the electric field distortion of the streamer head is less than one times the average electric field, less than 14.5 cm when the electric field distortion is one to five times the average electric field, and less than 12 times the average electric field when the streamer will break through the rod plate gap. The creation of diffuse zone is mostly caused by the accumulation of negative ion layer. This is due to the negative ion layer's augmentation of the electric field in the plate electrode region, which makes it simpler for electrons to get energy, as well as the intensification of the ionization and excitation reactions.
The negative DC rod plate discharge experiment is conducted to ensure the simulation model's accuracy, and the calculated discharge current and experimental discharge current are compared. According to the experimental findings, the streamer and anode glow regions make up the streamer corona. The shape and placement of the streamer, which has a length of approximately 16.66 cm, change depending on the voltage being used. Anode glow area development is mostly due to the distortion of the anode electric field brought on by the negative ion sheath.
In summary, the insights reached in this work can serve as a theoretical foundation for explaining the mechanism of streamer discharge formation and development in negative polarity corona discharge as well as plasma preparation.

Key words： Streamer corona glow discharge Raether criterion Meek criterion ion sheath rod-plate gap

收稿日期: 2022-11-21

PACS:

TM851

基金资助:

山东省重点研发计划资助项目（2019GGX102049）

通讯作者: 李长云 1974年生,男,工学博士,副教授,主要从事高压电气设备运行与故障诊断、能源互联网中绝缘技术的教学与科研工作。E-mail：sdlcyee@sdust.edu.cn

作者简介: 李岩青 1998年生,男,硕士研究生,研究方向为高电压气体放电。E-mail：874752886@qq.com

引用本文:

李长云, 李岩青, 于永进. 大气条件下厘米级棒-板间隙负极性电晕放电中流注的产生与发展机制[J]. 电工技术学报, 0, (): 222186-222186. Li Changyun, Li Yanqing, Yu Yongjin. Study on the Generation and Development Mechanism of Streamers in Centimeter-Level Rod-Plate Gap Negative Corona Discharge Under Atmospheric Conditions. Transactions of China Electrotechnical Society, 0, (): 222186-222186.

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