Time-resolved characteristics of a nanosecond pulsed multi-hollow needle plate packed bed dielectric barrier discharge  

作　　者：秦亮 李瑶 郭浩 姜楠 宋颖 贾锐 周雄峰 袁皓 杨德正 Liang QIN;Yao LI;Hao GUO;Nan JIANG;Ying SONG;Rui JIA;Xiongfeng ZHOU;Hao YUAN;Dezheng YANG(Key Laboratory of Materials Modification by Laser,Ion,and Electron Beams(Dalian University of Technology),Ministry of Education,Dalian 116024,People’s Republic of China;School of Electrical Engineering,Dalian University of Technology,Dalian 116024,People’s Republic of China;State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System,Luoyang 471003,People’s Republic of China;School of Physics and Materials Engineering,Dalian Minzu University,Dalian 116600,People’s Republic of China)

机构地区：[1]Key Laboratory of Materials Modification by Laser,Ion,and Electron Beams(Dalian University of Technology),Ministry of Education,Dalian 116024,People’s Republic of China [2]School of Electrical Engineering,Dalian University of Technology,Dalian 116024,People’s Republic of China [3]State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System,Luoyang 471003,People’s Republic of China [4]School of Physics and Materials Engineering,Dalian Minzu University,Dalian 116600,People’s Republic of China

出　　处：《Plasma Science and Technology》2024年第7期48-57,共10页等离子体科学和技术（英文版）

基　　金：supported by National Natural Science Foundations of China(Nos.51977023 and 52077026);the Fundamental Research Funds for the Central Universities(No.DUT23YG227)。

摘　　要：In this paper,self-designed multi-hollow needle electrodes are used as a high-voltage electrode in a packed bed dielectric barrier discharge reactor to facilitate fast gas flow through the active discharge area and achieve large-volume stable discharge.The dynamic characteristics of the plasma,the generated active species,and the energy transfer mechanisms in both positive discharge(PD)and negative discharge(ND)are investigated by using fast-exposure intensified charge coupled device(ICCD)images and time-resolved optical emission spectra.The experimental results show that the discharge intensity,number of discharge channels,and discharge volume are obviously enhanced when the multi-needle electrode is replaced by a multihollow needle electrode.During a single voltage pulse period,PD mainly develops in a streamer mode,which results in a stronger discharge current,luminous intensity,and E/N compared with the diffuse mode observed in ND.In PD,as the gap between dielectric beads changes from 0 to250μm,the discharge between the dielectric bead gap changes from a partial discharge to a standing filamentary micro-discharge,which allows the plasma to leave the local area and is conducive to the propagation of surface streamers.In ND,the discharge only appears as a diffusionlike mode between the gap of dielectric beads,regardless of whether there is a discharge gap.Moreover,the generation of excited states N_(2)^(+)(B^(2)∑_(u)^(+))and N2(C^(3)Π_(u))is mainly observed in PD,which is attributed to the higher E/N in PD than that in ND.However,the generation of the OH(A^(2)∑^(+))radical in ND is higher than in PD.It is not directly dominated by E/N,but mainly by the resonant energy transfer process between metastable N_(2)(A^(3)∑_(u)^(+))and OH(X^(2)Π).Furthermore,both PD and ND demonstrate obvious energy relaxation processes of electron-to-vibration and vibration-to-vibration,and no vibration-to-rotation energy relaxation process is observed.

关 键 词：packed bed reactor multi-hollow needle electrodes positive and negative discharges optical emission spectra time-resolved images 

分 类 号：TN2[电子电信—物理电子学]