摘要
大气压空气中介质阻挡均匀放电产生的等离子体在工业领域具有广阔的应用前景。为研究这种放电的产生条件及机理,利用微间隙介质阻挡放电装置,通过测量放电参数和发射光谱,研究了放电模式的转化过程。结果表明:低电压时电流波形每半个周期存在若干个脉冲宽度很小的脉冲,为微放电丝模式;随着电压增加,电流每半个周期出现了一个宽度较大(约5.5μs)强度较强的脉冲,该较宽电流脉冲上随机叠加了宽度小(约100 ns)强度弱的小脉冲;外加电压峰值达到9.2 kV时,电流波形只存在该较宽放电脉冲,为均匀放电模式。放电发射光谱的研究表明:外加电压增加时谱线强度比降低,即高能电子比例减小。这说明随外加电压增加,微气隙中的放电电场强度是降低的。
The plasmas generated by dielectric barrier discharge in atmospheric pressure air have wide industrial application prospect. In order to study the generation condition and mechanism of this discharge, we studied the transition of discharge mode using electrical methods and emission spectroscopy based on experiments conducted with a micro-gap discharge device. It is obtained that the discharge is in micro-discharge filament mode when it initiates at a low voltage, and there are multiple current pulses with short pulse width in every half period of applied voltage. A hump gradually appears in the waveform of discharge current with increasing applied voltage. This hump with width of about 5.5 μs appears once in every half period of applied voltage, and it is superimposed with some random discharge pulses with width of about 100 ns. When the peak of applied voltage reaches to 9.2 kV, there are only the discharge humps in the waveform of discharge current, which indicates that the discharge is in uniform mode. The obtained optical emission spectroscopy shows that the intensity ratio of 391.4 nm to 337.1 nm reduces with increasing applied voltage, i.e. the number of high-energy electrons decreases. This indicates that the intensity of electric field decreases with increasing applied voltage.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2015年第2期572-577,共6页
High Voltage Engineering
基金
河北省教育厅青年基金项目(QN20131093)~~
关键词
介质阻挡放电
微放电丝
均匀放电
转换过程
电流脉冲
谱线强度比
dielectric barrier discharge
micro-discharge filament
uniform discharge
conversion process
current pulse
line-intensity ratio
