A dual-frequency (DF) dielectric barrier discharge, excited by the superposition of a 50 Hz low frequency (LF) and a 5000 Hz intermediate frequency (IF), is proposed to enhance discharge. The effect of the LF voltage component on the breakdown behaviour of the DF discharge during different periods has been studied both experimentally and numerically. The number of high-current pulses rises as the LF voltage increases. The statistical analysis shows that the number of the current pulse amplitude above 80 mA in the DF discharge reaches nearly 6 times that in the IF discharge. Additionally, the total discharge energy in the DF discharge is significantly higher than that in the IF discharge. The simulation reproduces the temporal variation of the breakdown behaviours in the DF discharge. The simulated results reveal that the maximal electric field strength of the breakdown process is greater in the DF discharge compared to the IF discharge during a half-period of DF. Finally, the comparison between the IF and DF discharges exhibits that the LF voltage regulates the accumulation of residual charged species on the dielectric surface after the breakdown by modulating the residual voltage between the air gap.

中文翻译：

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50 Hz/5000 Hz双频激励大气压空气介质阻挡放电实验与数值研究

提出了一种由 50 Hz 低频 (LF) 和 5000 Hz 中频 (IF) 叠加激励的双频 (DF) 介质阻挡放电来增强放电。通过实验和数值研究了不同时期LF电压分量对DF放电击穿行为的影响。高电流脉冲的数量随着 LF 电压的增加而增加。统计分析表明，DF放电中电流脉冲幅度超过80 mA的数量达到IF放电的近6倍。此外，DF放电中的总放电能量明显高于IF放电中的总放电能量。该模拟再现了 DF 放电中击穿行为的时间变化。模拟结果表明，在DF半周期内，DF放电的击穿过程的最大电场强度比IF放电更大。最后，IF 和 DF 放电之间的比较表明，LF 电压通过调制气隙之间的残余电压来调节击穿后电介质表面上残余带电物质的积累。