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

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 atmospheric fuel-air mixtures at room temperature. High-impedance streamer, transi...

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Bibliographic Details
Published in:Journal of physics. D, Applied physics Applied physics, 2024-11, Vol.57 (43)
Main Authors: Jiang, Chunqi, Dhotre, Akash C, Lai, Meimei, Biswas, Sayan, MacDonald, James R, Ekoto, Isaac W
Format: Article
Language:English
Subjects:
combustions
ignitions
plasmas
pulsed
quiescent
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Summary: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 atmospheric fuel-air mixtures at room temperature. 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.
ISSN:0022-3727
1361-6463
DOI:10.1088/1361-6463/ad6876