不同电极结构介质阻挡放电特性比较

Discharge Characteristics Comparison of Dielectric Barrier Discharge with Different Electrode Structures

采用电压-电流波形测量、发光图像拍摄、光谱分析等手段研究大气压空气中刃-板电极、针-板电极和柱-板电极结构介质阻挡放电(DBD)的放电特性,并研究电压幅值、电源频率及气隙距离对放电功率和分子振动温度等放电参量的影响,结合放电理论对不同电极结构DBD的特性进行分析。结果表明:3种电极结构DBD的电压电流波形、Lissajous图形以及光谱谱线体现出不同的特点,相同条件下柱-板电极结构DBD放电强烈,消耗放电功率多,粒子谱线强度高,放电电流可达200 mA。电极布置差异导致电场不均匀系数的不同是放电特性出现差异的主要原因。随着电压幅值、电源频率的增加和气隙距离的减小,3种电极结构放电增强,放电功率和分子振动温度增加。

The discharge characteristics of dielectric barrier discharge（DBD） with the edge-plate, nee-dle-plate, and column-plate electrode structure at atmospheric pressure in air were studied and compared by measuring voltage and current waveforms, taking lighting emission images, and using spectrum analy-sis. The effects of voltage amplitude, power frequency, and gap distance on the discharge power and mo-lecular vibrational temperature were studied, and the discharge characteristics of DBD with different elec-trode structures were analyzed by combining discharge theory. The results show that the voltage and cur-rent waveforms, Lissajous figures, and emission spectrum of three electrode structures DBD show differ-ent characteristics. At the same conditions, the column-plate electrode structure DBD has the strongest dis-charge and the most dissipated discharge power, and the discharge current can reach 200 mA. The ar-rangement of the electrode leads to the difference of nonuniform coefficient, which is the main reason of the difference of discharge characteristics. With the increase of voltage amplitude and power frequency and the decrease of gap distance, the discharge become strong, and the discharge power and molecular vi-brational temperature increase.