微秒和纳秒脉冲激发介质阻挡放电传输电荷特性对比

Comparison for Characteristics of Transported Charges in Dielectric Barrier Discharge Driven by Microsecond and Nanosecond Pulsed Powers

介质阻挡放电(简称DBD)在表面改性、污水处理、航空流动控制等工业领域有巨大的应用前景。为此基于实验室自制的微秒和纳秒脉冲电源激发介质阻挡放电,对比研究不同量级脉冲下的传输电荷特性以及放电参数对传输电荷特性的影响。DBD系统采用被称为"体放电"的板-板间隙放电,实验在大气压空气中进行。实验结果讨论了不同激励下Lissajous图形的变化情况,同种实验条件下,微秒比纳秒更容易激发放电,且最大传输电荷量和单脉冲能量更高,但纳秒激励下瞬时功率更高;保持其它条件不变,仅改变某一放电参数,最大传输电荷量和单脉冲能量随着电压幅值的升高而增大,随着阻挡介质的厚度的增加而降低;重复频率对电参数和Lissajous图形几乎没有影响,但决定着单位时间内的能量积累;随着放电间隙的增大,最大传输电荷量逐渐减小,而单脉冲放电能量呈先增大后减小的趋势。

Dielectric barrier discharge （DBD） is a promising technology in applications of surface modification, bio- medical treatment and airflow control. On the basis of a homemade microsecond-pulse source and a homemade nanosecond-pulse source, we conducted DBD experiments under different magnitude pulses for comparison and studied characteristics of transported charges influenced by parameters of actuators and energy supply. We chose the plate-to-plate discharge system known as the ＂body discharge＂, and performed experiments at atmospheric in open air. According to experimental results, changes of Lissajous figures under different excitation were discussed. Under the same experimental conditions, microsecond activation was easier to excite discharge than nanosecond and it had higher maximum trans- ported charges and single pulse energy. While nanosecond excitation had higher instantaneous power. While keeping other conditions constant, both the transported charges and single pulse energy were approximately in proportion to the applied voltage amplitude and proportionally decreased with increasing thickness of dielectric barrier. The pulse frequen- cy had slight influence on the electrical parameters and the Lissajous figures of discharges, but significantly affected the energy accumulation per unit time. With electrode gap spacing increasing, the maximum transported charges became lower, while the single pulse energy increased at first and then decreased in the end.