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Experimental investigation of the stochastic early flame propagation after ignition by a low-energy electrical discharge

Essmann, S.; Markus, D.; Grosshans, H.; Maas, Ulrich

Abstract:
In the context of explosion protection, very conservative safety factors need to be considered, e.g. in the design of electrical devices. This is due to standards which are mainly based on empirical data as opposed to a detailed knowledge of the underlying physiochemical processes. In this work, the early phase of ignition of burnable gas mixtures close to their respective minimum ignition energy is investigated experimentally by means of high-speed schlieren imaging. Our data quantifies how the ignition process at such low energies becomes less repeatable which is evidenced by a high scattering of the flame propagation. It was found that, depending on the mixture, the flow field induced by the electrical discharge may exhibit a considerable effect on the ignition process. This effect is more pronounced for mixtures which are characterized by a large Lewis number, thus, leading to a more random flame propagation.

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Verlagsausgabe §
DOI: 10.5445/IR/1000100013
Veröffentlicht am 19.11.2019
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Technische Thermodynamik (ITT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 0010-2180, 1556-2921
KITopen-ID: 1000100013
Erschienen in Combustion and flame
Band 211
Seiten 44-53
Schlagwörter Spark ignition; Minimum ignition energy; Lewis number; Highspeed schlieren
Nachgewiesen in Scopus
Web of Science
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