大气压交流金属针-水电极放电特性研究

doi:10.19595/j.cnki.1000-6753.tces.230435

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摘要

气液两相放电受到诸多放电因素的影响,在液体表面表现出较为复杂的放电特性与相互作用。该文采用大气压交流金属针-水电极放电结构,对其放电特性及规律进行研究。实验结果表明,随着电源功率的增大,大气压交流金属针-水电极的放电由两种不稳定放电模式转变为稳定放电模式。电源功率足够高时,放电在正负半周期出现截然不同的放电模式,结合放电影像和电气特性对其放电的时空演化过程进行了分析,研究了电源功率和放电间隙对放电特性及参数的影响。研究发现,击穿电压随电源功率的增大从2.3 kV减小到2.0 kV,随放电间隙的增大从1.0 kV增加到1.9 kV;电流峰值和功率峰值只在正半周期时与放电间隙的大小呈正相关关系;传导电荷量随电源功率的增大而增多,与放电间隙没有明显的关系;单次放电能量中,正半周期放电能量始终大于负半周期的放电能量,正负半周期放电能量与电源功率呈正相关关系,与放电间隙没有明显的相关性。

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关键词 ：气液两相放电, 低温等离子体, 交流放电, 放电影像

Abstract：

This reserach based on the atmospheric pressure alternating current (AC)metal needle-water electrode discharge device. And the influences of needle-water distance and supply powers on the discharge characteristics of metal needle-water electrode have been studied.
The experimental results showed that the discharge of modes a and b occurred when the supply powers were small, and the discharge modes of them were unstable. The differences were that the discharge mode a was more like corona discharge, and the water surface under the needle electrode would be sunken. The discharge mode b was similar to spark discharge, and the discharge channel in the discharge gap was tortuous. Mode c only existed in the negative half cycle of discharge, and had an axisymmetric structure. Continuing to increase the supply powers, mode c switched to discharge mode d, which not only had the disk structure of mode c, but also had some bright filamentous discharge.
The spatial-temporal evolution process of mode d discharge had been studied. It was found from the ICCD discharge images that the discharge morphology in the positive half cycle extended from the metal needle electrode to the water surface, and diffused into many filaments around the water surface. These discharge filaments had multiple contact points with the water surface, and the contact points moved continuously on the water surface during the discharge process. The negative half-cycle discharge morphology was axisymmetric as a whole, showing different layered structural characteristics. This structure was consistent with the glow discharge form or the Trichel pulse discharge structure.
The experimental results showed that when the metal needle electrode was a positive high voltage electrode, the breakdown voltage dropped from 2.3 kV to 2.0 kV with the increase of supply powers, and the discharge start time in the cycle was advanced from 16 μs to 9 μs, while the maintenance voltage and discharge termination time had little change. When the metal needle electrode was a negative high voltage electrode, the breakdown voltage dropped from 1.4 kV to 1.0 kV as the supply powers increased. the peak current (about 40.0 mA) and peak power (about 50.0 W) of discharge were roughly equal. However, the peak values of the three were all less than the corresponding peak values of the positive half cycle. And the discharge energy of the positive half cycle was always greater than that of the negative half cycle.
The influences of discharge gaps on the discharge characteristics of mode d have been studied. The results showed that when the metal needle electrode was a positive high voltage electrode, as the discharge gap increased from 1.0 mm to 5.0 mm, the breakdown voltage increased from 1.2 kV to 3.2 kV, the current peak value increased from 56.4 mA to 392.1 mA, and the power peak value increased from 68.9 W to 992.2 W, but the discharge start time in the cycle delayed from 6 μs to 16 μs, while the maintenance voltage and discharge termination time had little change. With a 6.0 mm discharge gap, there was no plasma generated in the first half cycle. When the metal needle electrode was a negative high voltage electrode, as the discharge gaps increased, the breakdown voltage increased from 1.0 kV to 1.9 kV, and the peak current and the peak power were approximately equal. There was no positive or negative correlation between the amount of conductive charge and the size of the discharge gaps. The conductive charge in the positive half cycle was basically maintained at 1.2×10^-6 C. The discharge energy in the positive half cycle was always greater than that in the negative half cycle.

Key words： Gas-liquid two-phase discharge non-thermal plasma AC discharge images of discharge

收稿日期: 2023-04-07

PACS:	O536
	TM85

基金资助:

国家自然科学基金项目（51877024）和黑龙江省自然科学基金项目（JJ2020LH0842）资助

通讯作者: 俞哲男,1985年生,讲师,硕士生导师,研究方向为等离子体源设计与应用等。E-mail：yz_8877@163.com

作者简介: 肖越男,1994年生,硕士研究生,研究方向低温等离子体源研究与应用。E-mail：dmu-xiaoyue@foxmail.com

引用本文:

肖越, 俞哲, 王迪雅, 张腾宇, 宋春莲. 大气压交流金属针-水电极放电特性研究[J]. 电工技术学报, 0, (): 239619-239619. Xiao Yue, Yu Zhe, Wang Diya, Zhang Tengyu, Song Chunlian. Research on Discharge Characteristics of AC Excited Metal Needle-Water Electrode at Atmospheric Pressure. Transactions of China Electrotechnical Society, 0, (): 239619-239619.

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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.230435 https://dgjsxb.ces-transaction.com/CN/Y0/V/I/239619

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