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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(3P) 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<10%，单次放电持续时间缩短 77%，激发态氧原子 O(3P) 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(3P) 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 applied in fields such as sterilization, disinfection, and ozone generation. The secondary discharge process significantly affects the effective ozone production duration and efficiency. However, the mechanism by which oxygen concentration influences secondary discharge characteristics and the yield of target products remains unclear. To address this issue, we developed a fluid-based analysis model of the secondary positive streamer discharge process between needle-plate electrodes under varying oxygen concentrations. This model accounts for the radial electric field and resolves potential non-physical branching issues that may arise in discharge simulations at high oxygen concentrations. In this study, we examine the effect of oxygen concentration on the optical emission characteristics of secondary positive streamers. The optical emission intensity, cathode charge transfer, and the yield of excited-state oxygen atoms (O(3P)) under different oxygen concentrations are investigated and compared with experimental data. The results indicate that when the oxygen concentration increases from 20% to 90%, the optical emission intensity of the secondary discharge decreases by approximately 0.2%. Meanwhile, the average electron density in the discharge channel decreases by 90%, the electric field intensity changes by less than 10%, and the single discharge duration shortens by 77%. Under these conditions, the proportion of O(3P) yield originating from the primary discharge increases from 20% to 38%, and the unit energy yield of excited-state oxygen atoms O(3P) rises by 64%. Although the reduced discharge duration lowers the absolute O(3P) yield by 50%, the increase in unit energy yield more than compensates for the decrease in single-discharge yield. The decrease in single-discharge yield with increasing oxygen concentration arises from enhanced two- and three-body adsorption effects of oxygen molecules, which reduce the electron density. Additionally, the increased collision probability between electrons and oxygen molecules further influences these characteristic changes.
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Keywords:
- streamer discharge /
- fluid simulation /
- numerical simulation /
- duration
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