大气压交流气液两相滑动弧放电特性

Discharge Characteristic of Atmospheric Pressure AC Gas-Liquid Phase Gliding Arc

滑动弧放电可以在大气压下产生低温等离子体,在能源、环境及医学等领域具有广阔的应用前景。本工作对大气压交流气液两相滑动弧放电图像和多因素影响放电特性的规律进行了实验研究,通过对电信号进行快速傅里叶变换(FFT),分析放电过程中能量注入特点。研究结果表明:气液两相滑动弧放电稳定,与气相滑动弧相比放电强度减弱,但是等离子体分布均匀,出现明亮斑点;放电电流信号特征发现,滑动弧放电过程包括击穿伴随滑动模式和稳定滑动模式,与气相滑动弧放电相比,气液两相滑动弧的滑动周期变长;放电电压和电流信号的频谱分析发现,气液两相滑动弧放电电压和放电电流谐波的含量相比气相滑动弧放电明显减少,放电稳定性提高;气体流量和峰值电压对平均放电功率的影响规律与相同条件下气相滑动弧放电基本一致,增加液体流量和水溶液电导率,雾化液滴在放电过程中对高能电子的吸附作用增强,使得平均放电功率下降。

Gliding arc discharge can produce low temperature plasma at atmospheric pressure, which exhibits broad application prospects in the fields of energy, environment and medicine. In this work, experimental research on the images of atmospheric pressure AC gas-liquid gliding arc and the influences of several factors on the discharge characteristics were investigated. The energy injection characteristics during discharge were analyzed by Fast Fourier Transform(FFT) of electrical signals. The results showed that the gas-liquid gliding arc discharge was more stable than gas-phase gliding arc discharge, but the discharge intensity decreased. The plasma distributed evenly with bright spots appearance. The discharge-current-signal characteristics showed that the gas-liquid gliding arc discharge process included the breakdown gliding mode and the steady arc gliding mode, which had a longer sliding cycle than the gas-phase gliding arc discharge. Spectral analysis of discharge voltage and current signals found that the harmonic contents of gas-liquid gliding arc discharge voltage and discharge current were significantly reduced compared with gas-phase gliding arc discharge, further proving the improvement of discharge stability.Under the same conditions, the effects of gas flow and peak voltage on the average discharge power were basically the same as those of gas-phase gliding arc discharge. With the increase in liquid flow and water solution conductivity, the adsorption effect of atomized droplets on high-energy electrons in the discharge process enhanced, resulting in a decrease in the average discharge power.