大气压脉冲放电等离子体射流特性及机理研究  

Discharge characteristics and mechanism of plasma plume generated by atmospheric pulsed discharge

作　　者：张亚容[1] 韩乾翰 郭颖[1,2] 张菁[1,2] 石建军[1,2] Zhang Ya-Rong;Han Qian-Han;Guo Ying;Zhang Jing;Shi Jian-Jun(Textiles Key Laboratory for Advanced Plasma Technology and Application,College of Science,Donghua University,Shanghai 201620,China;Magnetic Confinement Fusion Research Center of Ministry of Education,Donghua University,Shanghai 201620,China)

机构地区：[1]东华大学理学院,纺织行业先进等离子体物理与技术重点实验室,上海201620 [2]东华大学,磁约束核聚变教育部研究中心,上海201620

出　　处：《物理学报》2021年第9期133-138,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11875104,11475043)资助的课题。

摘　　要：通过实验和数值模拟研究了大气压脉冲放电等离子体射流,其中在脉冲电压上升沿阶段的放电中形成等离子体子弹并向接地电极输运,其传播速度在10~4 m·s~(–1)量级.数值模拟研究还发现等离子体子弹邻近区域内增强的电场强度可达到10~6 V·m~(–1),说明等离子体子弹的形成主要由放电空间局域增强的电场导致,在接地电极附近会得到进一步增强.放电空间的电子密度时空演变过程揭示了等离子体子弹经过的区域会保持较高的电子密度,说明等离子体子弹的拖尾现象;而等离子体子弹头部增强的电子产生率与局域增强的电场强度对应,这说明了等离子体子弹产生的动力学过程.该大气压脉冲放电等离子体射流中等离子体子弹的特性和机理研究为发展大气压等离子体射流提供了理论和技术基础.Atmospheric pressure plasma plume generated by pulsed discharge is studied by experimental diagnostics and numerical simulations.It is found that the plasma plume is generated in the rising phase of pulse voltage,in which a plasma bullet propagates toward the ground electrode at a speed on the order of 104 m/s.It is also found that the electric field in the vicinity of the plasma bullet reaches 106 V/m,indicating that the formation of plasma bullet can be attributed to the localized enhanced electric field,which will be enhanced near to the grounded electrode.The spatiotemporal evolution of electron density in the discharge reveals that the residual electron density remains after the plasma bullet has passed through,which explains the tailing phenomenon of plasma bullet.The enhanced electron generation rate at the head of plasma bullet corresponds to the localized enhanced electric field,which explains the generation mechanism of plasma bullet.This study of the characteristics and mechanism of plasma bullet provides a theoretical basis for developing the atmospheric plasma plume generated by pulsed discharge.

关 键 词：等离子体射流 数值模拟 脉冲放电 

分 类 号：O53[理学—等离子体物理] O461.25[理学—物理]