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Conventional spark versus nanosecond repetitively pulsed discharge for a turbulence facilitated ignition phenomenon

Nguyen, M. T.; Shy, S. S. 1; Chen, Y. R.; Lin, B. L.; Huang, S. Y.; Liu, C. C. 1
1 Institut für Technische Thermodynamik (ITT), Karlsruher Institut für Technologie (KIT)

Abstract:

This work applies both conventional-single-spark-discharge (CSSD) at 500-µs pulse duration time and nanosecond-repetitively-pulsed-discharge (NRPD) at various pulsed-repetitive-frequency PRF = 5–70 kHz to explore a turbulence facilitated ignition (TFI) phenomenon using a pair of pin-to-pin electrodes at an inter-electrode gap of 0.8 mm in randomly-stirred lean n-butane/air mixture with Lewis number ≫ 1. For CSSD, measured laminar and turbulent minimum ignition energies (MIE$_{L}$ and MIE$_{T}$) at 50% ignitability show that MIE$_{L}$≈ 23 mJ > the smallest MIE$_{T}$≈ 19.7 mJ at u′ = 0.9 m/s (TFI) and then MIE$_{T}$≈ 28.6/30.8/36.8 mJ at u′ = 1.4/2.1/2.8 m/s (no TFI), where u′ is the r.m.s turbulent fluctuating velocity. For comparison, all NRPD experiments apply the same total ignition energy E$_{tot}$≈ 23 mJ via a fixed train of 11 pulses, each pulse with 2.2 mJ except for the first pulse with 1 mJ. NRPD results show a cumulatively synergistic effect depending on the coherence between PRF and an inward reactant flow recirculation frequency (f$_{RC}$) inside the torus-like kernel induced by the discharge that could enhance ignition. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000135783
Veröffentlicht am 22.07.2021
Originalveröffentlichung
DOI: 10.1016/j.proci.2020.06.020
Scopus
Zitationen: 23
Web of Science
Zitationen: 22
Dimensions
Zitationen: 25
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Technische Thermodynamik (ITT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 1540-7489
KITopen-ID: 1000135783
Erschienen in Proceedings of the Combustion Institute
Verlag Elsevier
Band 38
Heft 2
Seiten 2801–2808
Nachgewiesen in Dimensions
Web of Science
Scopus
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