Document Type

Article

Publication Date

2024

Publication Title

Journal of Physics D: Applied Physics

Volume

57

Issue

43

Pages

435203 (1-13)

DOI

10.1088/1361-6463/ad6876

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.

Rights

© 2024 The Authors.

Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 International License(CC BY 4.0). Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

Data Availability

Article states: "All data that support the findings of this study are included within the article (and any supplementary files)."

Original Publication Citation

Jiang, C., Dhotre, A. C., Lai, M., Biswas, S., MacDonald, J. R., & Ekoto, I. W. (2024). On the modes of nanosecond pulsed plasmas for combustion ignition of quiescent CH₄-air mixtures. Journal of Physics D: Applied Physics, 57(43), 1-13, Article 435203. https://doi.org/10.1088/1361-6463/ad6876

ORCID

0000-0001-8895-2580 (Jiang), 0000-0002-3325-9890 (Lai)

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