Effects of inter-pulse coupling on nanosecond pulsed high frequency discharge ignition in a flowing mixture

Mao, Xingqian; Zhong, Hongtao; Wang, Ziyu; Ombrello, Timothy; Ju, Yiguang

doi:10.1016/j.proci.2022.06.018

Effects of inter-pulse coupling on nanosecond pulsed high frequency discharge ignition in a flowing mixture

Journal Article · Thu Jul 21 00:00:00 EDT 2022 · Proceedings of the Combustion Institute

DOI:https://doi.org/10.1016/j.proci.2022.06.018· OSTI ID:1906154

^[1]; ^[2]; ^[2]; Ombrello, Timothy ^[3]; Ju, Yiguang ^[2]

Princeton Univ., NJ (United States); Princeton University
Princeton Univ., NJ (United States)
Air Force Research Lab., Wright-Patterson AFB, OH (United States)

This work numerically investigates the effects of non-equilibrium nanosecond plasma discharge pulse rep- etition frequency, pulse number, and flow velocity on the critical ignition volume, minimum ignition energy, and chemistry in a plasma-assisted H 2 /air flow at 300 K and 1 atm using a multi-scale adaptive reduced chemistry solver for plasma assisted combustion (MARCS-PAC). The interactions between discharges/ignition kernels spanning decoupled, partially-coupled and fully-coupled regimes in a pulse train are studied. For a single pulse discharge, increased flow velocity increases the minimum ignition energy required due to the increase of convective heat loss and flame stretch. The results show that the minimum ignition kernel prop- agation speed at the critical ignition kernel volume increases with the flow velocity. The minimum critical ignition volume decreases with the increase of plasma discharge energy. For sequential two-pulse discharges, ignition fails at both decoupled and partially-coupled regimes even when the total discharge energy is above the minimum ignition energy, but succeeds only in the fully-coupled regime at a shorter inter-pulse time. Overlap of the OH radical pool between the sequential two-pulse discharges and the increase of the chemistry effect due to the increase of reduced electric field in the fully-coupled regime contribute to the ignition enhancement. In addition, for two-pulse discharges in the fully-coupled discharge regime, the mixture can be ignited at a total energy below the minimum ignition energy of a single pulse with the same flow conditions. Moreover, for a given total discharge energy with multiple pulsed discharges, the enhancement of the ignition kernel volume has a non-monotonic dependence on discharge frequency and pulse number. The effective ignition enhancement can be achieved with an optimal pulse repetition frequency and pulse number. Furthermore, this work provides a new understanding of the mechanism for repetitive plasma ignition and insights for the optimization of plasma ignition in a reactive flow.

View Accepted Manuscript (DOE)

Research Organization:: Princeton Univ., NJ (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: SC0020233

OSTI ID:: 1906154

Report Number(s):: DOE-Princeton--0020233

Journal Information:: Proceedings of the Combustion Institute, Journal Name: Proceedings of the Combustion Institute Journal Issue: 4 Vol. 39; ISSN 1540-7489

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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