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Numerical Studies on Minimum Ignition Energies in Methane/Air and Isooctane/Air Mixtures

Wu, Chunwei; Schießl, Robert; Maas, Ulrich

Abstract:
In this study, the dependence of minimum ignition energies (MIE) on ignition geometry, ignition source radius and mixture composition is investigated numerically for methane/air and isooctane/air mixtures. Methane and isooctane are both important hydrocarbon fuels, but differ strongly with respect to their Lewis numbers. Lean isooctane air mixtures have particularly large Lewis numbers.
The results show that within the flammability limits, the MIE for both mixtures stays almost constant, and increases rapidly at the limits. The MIEs for both fuels are also similar within the flammability limits. Furthermore, the MIEs of isooctane/air mixtures with a small spherical ignition source increase rapidly for lean mixtures. Here the Lewis number is above unity, and thus, the flame may quench because of flame curvature effects. The observations show a distinct difference between ignition and flame propagation for iso-octane. The minimum energy required for initiating a successful flame propagation can be considerably higher than that required for initiating an ignition in the ignition volume. For iso-octane with a small spherical ignition source, this effect was observed at all equivalence ratios. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000132255
Veröffentlicht am 30.04.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Technische Thermodynamik (ITT)
Publikationstyp Proceedingsbeitrag
Publikationsdatum 20.08.2020
Sprache Englisch
Identifikator KITopen-ID: 1000132255
Erschienen in Proceedings of the 13th International Symposium on Hazards, Prevention and Mitigation of Industrial Explosions (ISHPMIE 2020), Braunschweig, Germany, July 27–31, 2020. Ed.: Physikalisch-Technische Bundesanstalt
Veranstaltung 13th International Symposium on Hazards, Prevention and Mitigation of Industrial Explosions (ISHPMIE 2020), Braunschweig, Deutschland, 27.07.2020 – 31.07.2020
Verlag Physikalisch-Technische Bundesanstalt (PTB)
Seiten 994–1004
Externe Relationen Abstract/Volltext
Schlagwörter Ignition energy, spark ignition, detailed chemistry
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