On the modes of nanosecond pulsed plasmas for combustion ignition of quiescent CH4-air mixtures

IF 3.1 3区 物理与天体物理 Q2 PHYSICS, APPLIED
Chunqi Jiang, Akash C Dhotre, Meimei Lai, Sayan Biswas, James R MacDonald and Isaac W Ekoto
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引用次数: 0

Abstract

The effect of transient plasma modes on ignition kernel development are discussed here for a quiescent CH4-air combustion model system. A 10 ns high-voltage pulse was applied to a pin-to-pin electrode in lean fuel-air mixtures at room temperature and atmospheric pressure. High-impedance streamer, transient spark and low-impedance spark discharges were identified based on pulse waveforms of voltage and current. A sustained ignition kernel expansion was observed when the plasma discharge transitioned into a transient spark or spark discharge. The minimum ignition energy was obtained at the transient spark mode, which has less than a third of the energy or Coulomb transfer compared to the low-impedance spark. Employing repetitive 10-pulse sequence at 10 kHz, the lean-fuel limit was extended from an equivalence ratio of 0.6 for the single pulse ignition to 0.5. The use of repetitive pulses also allowed streamer breakdown or spark initiation to occur at a lower voltage.
纳秒脉冲等离子体在静态 CH4 空气混合物燃烧点火中的应用模式
本文讨论了静态 CH4 空气燃烧模型系统中瞬态等离子体模式对点火核发展的影响。在室温和大气压力下,对贫油-空气混合物中的针对针电极施加了 10 毫微秒的高压脉冲。根据电压和电流的脉冲波形,确定了高阻抗流、瞬态火花和低阻抗火花放电。当等离子体放电过渡到瞬态火花放电或火花放电时,可观察到持续的点火内核膨胀。瞬态火花模式获得的点火能量最小,与低阻抗火花相比,其能量或库仑传递不到三分之一。采用频率为 10 kHz 的 10 个重复脉冲序列后,贫油极限从单脉冲点火的 0.6 等效比扩大到 0.5。重复脉冲的使用还允许在较低电压下发生流线击穿或火花启动。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Physics D: Applied Physics
Journal of Physics D: Applied Physics 物理-物理:应用
CiteScore
6.80
自引率
8.80%
发文量
835
审稿时长
2.1 months
期刊介绍: This journal is concerned with all aspects of applied physics research, from biophysics, magnetism, plasmas and semiconductors to the structure and properties of matter.
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