不同氧浓度混合气体二次流注放电下激发态氧原子生成特性与影响因素  

Characteristics and influencing factors of excited oxygen atom generation in secondary streamer discharge of mixed gases with different oxygen concentrations

作　　者：魏振宇 刘亚坤[1] WEI Zhenyu;LIU Yakun(School of Electronic Information and Electric Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学电气工程系,电力传输与功率变换控制教育部重点实验室,上海200240

出　　处：《物理学报》2025年第4期214-224,共11页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:52377152);工信部民机专项-民机雷电与HIRF防护设计与试验技术(批准号:MJZ5-2N22)资助的课题。

摘　　要：流注放电被应用于消毒杀菌、臭氧生产等领域,其中二次流注放电过程对臭氧有效生产持续时间和效率影响明显,然而氧浓度对二次流注放电过程及目标产物产量的影响还不清楚.为此,开发不同氧浓度下针-板电极二次流注发展过程的流体分析模型,解决高氧浓度下流注放电模拟的非物理分支(branch)问题,分析氧浓度对二次正流注光发射特性的影响,研究不同氧浓度下的阴极转移电荷量和激发态氧原子O(^(3)P)产量,并与实验数据进行对比.结果表明,氧浓度由20%增加至90%后,二次流注放电通道电子密度平均降低90%,电场强度变化小于10%,单次放电持续时间缩短77%,激发态氧原子O(^(3)P)单位能量产率上升64%,同时放电时间缩短会使产量降低50%,但激发态氧原子O(^(3)P)单位能量产率的提高优于单次降产量.氧浓度增大引发氧分子二、三体吸附效应增强和电子密度下降是单次放电产量下降的原因,电子与氧分子碰撞概率提升是单位能量产率上升的原因.Streamer discharge has been widely used in fields of sterilization,disinfection,ozone generation,etc.The secondary discharge process significantly affects the effective ozone production duration and efficiency.However,the mechanism of oxygen concentration affecting secondary discharge characteristics and the yield of target products is still unclear.To address this issue,a fluid-based analysis model of the secondary positive streamer discharge process between needle-plate electrodes under varying oxygen concentrations is developed in this work.This model considers the radial electric field and resolves potential non-physical branching issues that may arise in discharge simulations at high oxygen concentrations.In this work,the effect of oxygen concentration on the optical emission characteristics of secondary positive streamers is examined.The optical emission intensity,cathode charge transfer,and the yields of excited-state oxygen atoms(O(^(3)P))under different oxygen concentrations are investigated and compared with experimental data.The results show that when the oxygen concentration increases from 20%to 90%,the light emission intensity of the secondary discharge decreases by about 0.2%.At the same time,the average electron density in the discharge channel decreases by 90%,the change of electric field intensity is less than 10%,and the duration of single discharge duration is shortened by 77%.Under these conditions,the proportion of O(^(3)P)yield originating from the primary discharge increases from 20%to 38%,and the unit energy yield of excited-state oxygen atoms O(^(3)P)rises by 64%.Although the reduction in discharge duration results in a 50%decrease in absolute O(^(3)P)yield,the increase in unit energy yield far compensates for the decrease in single-discharge yield.The single-discharge yield decreases with oxygen concentration increasing due to the enhanced two-and three-body adsorption effects of oxygen molecules,which reduce the electron density.Additionally,the increased collision probability between e

关 键 词：流注放电 流体模型 数值模拟 持续时间 

分 类 号：O461[理学—电子物理学]