大气压空气中均匀介质阻挡放电的产生及放电特性

Generation and Characteristics of the Homogeneous Dielectric Barrier Discharge in Air Under Atmospheric Pressure

采用微秒振荡脉冲电源激励,利用对称柱形铜电极以及环氧树脂阻挡介质,在大气压空气中产生均匀介质阻挡放电(dielectricbarrierdischarge,DBD)。测量了均匀DBD的电压–电流波形,拍摄了放电图像;建立了均匀DBD的等效电气模型,通过该等效模型计算得到等效电容、平均放电功率、放电电荷量、平均电子密度以及电子温度等重要电气参数值;并进一步研究了气隙电压、介质电压、放电电流和容性电流等参量的变化趋势以及它们之间的微观联系,讨论产生均匀DBD的放电机制。研究结果表明,采用作者的实验装置,在不大于4mm气隙间距下可以产生均匀DBD;当外加电压幅值为8kV时,均匀DBD的气隙放电消耗功率为31.45W,平均电子密度为2.07×1012cm?3,电子温度为3.4eV。

The homogenous dielectric barrier discharge （DBD） in air under atmospheric pressure was generated using a μs oscillatory pulse power supply to drive the symmetriccolumnar copper electrodes, and the epoxy served as dielectric barriers. The voltage and current waveforms of the homogenous DBD were measured, and lighting emission images were collected. With the established equivalent electrical model of homogenous DBD, the discharge parameters of homogenous DBD, such as equivalent capacitance, average discharge power, charge transport, average electron density and electron temperature were calculated. Furthermore, the change tendency and microscopic relationship among the voltage drop across air gap, the voltage drop across dielectric barrier, the discharge current and capacitive current were studied, and the discharge mechanism for generation of the homogenous DBD was discussed. Results showed that, with the experimental device developed by the authors of this paper, the homogenous DBD can be generated in the air gap less than 4mm. Under the applied voltage of 8 kV, the power dissipated by the air gap with the homogeneous DBD is 31.45W, and the average electron density and the electron temperature are 2.07×10^12 cm-3 and 3.4 eV, respectively.