强激光与粒子束2024，Vol.36Issue(10)：91-100,10.DOI:10.11884/HPLPB202436.240143
水中正极性丝状流注放电发展特性
Propagation characteristics of positive filamentary streamer discharges in water
摘要
Abstract
Positive underwater discharge can produce abundant physical and chemical effects and is widely used in the fields of energy source exploration and sterilization.However,the physical mechanisms involved in initiation and propagation of streamer are complex and have not been fully revealed,which limit the efficiency of underwater discharge applications.In this paper,we explore the mode-transition,reillumination and branching characteristics of positive filamentary streamer.The influence of deposited charge and space charge distribution on the propagation of streamer channel is clarified.Our research shows that the positive polarity filamentary streamers can be divided into primary streamer and secondary streamer,and the mode transition of discharges is greatly affected by the gas/liquid interface charge relaxation process.When the applied voltage reaches the accelerating voltage,the primary streamer rapidly transits into secondary streamer.The gas/liquid interface charge density and electric field in primary streamer channel are closely related with initiation,termination and reignition of discharge.The space charge distribution of secondary streamer is greatly affected by the voltage rising edge and the electrode surface structure.Longer voltage rise time leads to lower density of space charge and electric field at the head of streamer channel,which causes the decrease of streamer velocity.With larger radius of the micro-convex structure on the electrode surface,the branching of streamer will take place at the root of the main channel instead of electrode surface.Due to the variation of the spatial charge distribution,the velocity of the branching channel shows a trend of first declining and then increasing when the radius of the micro-convex structure is 5 μm.关键词
液体放电/流注放电/放电模式/界面电荷/流注分叉Key words
liquid discharge/streamer discharge/discharge mode/interface charge/streamer branching分类
信息技术与安全科学引用本文复制引用
温嘉烨,王亚桢,肖正光,王骏东,李元,张冠军..水中正极性丝状流注放电发展特性[J].强激光与粒子束,2024,36(10):91-100,10.基金项目
国家自然科学基金项目(52242706) （52242706）
