空心针-板电极中较大体积的大气压均匀放电

利用空心针-板电极装置,在大气压空气中产生了直流激励的均匀氩气等离子体羽.电学和光学测量结果表明,虽然采用直流电源驱动,但放电为周期性的脉冲.每个脉冲对应一个等离子体子弹从空心针向着阴极的传播过程.对放电特性随放电电压、电极间距和氩气流量的变化关系进行了研究.发现放电频率随电压的升高而增大,随距离和氩气流量的减小而增大.以直流空心针-板电极作为放电单元构成阵列,得到了较大体积的大气压均匀放电.

Atmospheric pressure uniform discharge with a fairly large volume between hollow-needle and plate electrodes

Through using a discharge device in a hollow-needle and plate electrode configurations, a atmospheric pressure uniform plasma plume is generated by DC voltage excitation in the ambient air with argon used as working gas. The plasma plume is a pulsed discharge despite a DC voltage is applied by optical and electrical methods. Every pulse corresponds to a propagating process of a plasma bullet from the hollow-needle tip to the plate electrode. The discharge characteristics of the plasma plume are investigated under different applied voltages, gap widths and gas flow rates. The results show that the discharge frequency increases with increasing the applied voltage, decreasing the gap width or decreasing the gas flow rate. An array is proposed, which is composed of several elements of the DC hollow-needle and plate electrode. A uniform discharge with fairly large volume is realized at atmospheric pressure air with this discharge array.