纳秒脉冲表面放电等离子体影响因素的实验研究

在大气环境条件下,以环氧为介质阻挡材料,基于单极性ns脉冲电源进行了表面介质阻挡放电实验,研究了电压幅值、电极宽度、电极间距和重复频率对放电等离子体的影响。结果表明ns脉冲表面介质阻挡放电是丝状放电,放电发生在电压脉冲的上升沿阶段;放电电流主要包括两部分脉冲,与放电丝分布的均匀性有着一定的内在关系,外加电压对放电的均匀性以及产生等离子体的长度起作用;电极宽度和间距对放电电流和产生等离子体的发光强度影响不大,电极宽度和间距越小,放电丝分布越均匀,电极宽度存在一个最优值,使得激励器的放电稳定且产生等离子体相对均匀;脉冲重复频率仅对等离子体强度起作用,对放电特性的影响较复杂,不同电极参数下这些影响与放电丝的分布状态有关。

Experimental Study on the Factors Influencing Nanosecond-pulsed Surface Discharge Plasma

Based on a magnetic compression solid-state pulsed power generator,experiments on surface dielectric barrier discharge(DBD) were carried out in air at atmospheric pressure.The effects of applied voltage,electrode width,electrode gap,and repetition frequency on surface discharge and plasma were investigated.The experimental results show that nanosecond-pulse surface DBD is a filamentary discharge in essence.Discharge takes place during the rising time of the applied voltage pulse.The discharge current mainly includes two parts of pulse,which have a certain intrinsic relationship with the uniformity of the filament distribution.The voltage amplitude is an important factor to the discharge uniformity and the length of plasma.The electrode width and gap have little influence on discharge current and plasma strength.The less width and gap are,the more uniform the filaments distribution is.Meanwhile,an optimum electrode width exists for the best electrical characteristic.Moreover,the influence of pulse repetition frequency is complex,and the repetition frequency just affects the discharge intensity.The influence of pulse repetition frequency is also affected by filament distribution under different electrode parameters.