水下多针电极微秒脉冲流光放电特性  

Discharge characteristics of a microsecond pulsed underwaterstreamer discharge in multi-needle electrode configuration

作　　者：杨双越 温小琼[1] 杨元天 李霄 Yang Shuang-Yue;Wen Xiao-Qiong;Yang Yuan-Tian;Li Xiao(School of Physics,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学物理学院,大连116024

出　　处：《物理学报》2024年第7期271-280,共10页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11635004,12375248)资助的课题。

摘　　要：多针电极结构是实现大体积水下放电的基础性电极结构,研究其放电基本特性对其他大体积水下放电电极结构的设计具有重要参考意义.本文构建了一个可安装21根针的多针电极,利用四分幅超高速相机研究了单个脉冲放电过程中可能放电的针电极数目以及电极阵列边缘和内侧针电极放电形态的差异;采用COMSOL软件模拟计算了多针电极结构的电场分布,讨论了电场分布对多针电极放电的影响,研究了多针电极结构的放电能量效率.结果发现:在单个脉冲放电过程中,21根针电极不是同时发生放电的,最大放电针电极数目随电压和针针间距的增大而增加.在同一个脉冲放电过程中,位于电极阵列边缘的针电极相比于位于阵列内侧的针电极产生的流光丝较长且偏离针电极轴线的偏角相对较大,这主要是针电极之间电场相互叠加干扰引起的.针针间距越小,针电极之间电场的相互叠加干扰越大,阵列边缘与内侧电极放电形态的差异越大,放电能量效率越低.The underwater streamer discharge has received extensive attention in the field of environmental protection,because it can generate free radicals and reactive oxygen species directly in water.The multi-needle electrode is a basic electrode configuration for achieving large-volume underwater streamer discharge.Understanding the discharge characteristics of the multi-needle electrode configuration is important for designing the large-volume discharge reactors.In this work,a multi-needle electrode that can assemble 21 needles is employed.The number of anode needles generating a streamer discharge during a single pulsed discharge and the differences in morphological characteristics between the inside and the edge of the electrode array are investigated by using an ultra-high-speed camera system.The electric field distribution of the multineedle electrode is simulated by using the COMSOL software,and the effect of the electric field distribution on the discharge of multi-needle electrode is also studied.The discharge energy efficiency of the multi-needle electrode configuration is evaluated.It is found that the 21 needles are not discharged simultaneously during a discharge pulse.The number of discharged anode needles gradually increases and then reaches a maximum value(≤21).The maximum number of discharged anode needles during a single discharge pulse increases as the voltage and needle spacing increases.During a single discharge pulse,the filament generated from the needles at the edge of the electrode array grows longer and deviates more largely from the needle axis than that generated from the needles inside the electrode array.Such characteristics are primarily due to the disturbance of the electric field among the 21 needles.As the needle spacing decreases,the disturbance of the electric field among the 21 needles gets stronger,consequently,the discharge morphology differences between the needles at the edge and needles at the inner of the needle array become more significant,and the energy efficiency of the d

关 键 词：水下流光放电 多针电极结构 电场分布 

分 类 号：O461.2[理学—电子物理学]