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Time scale analysis of the homogeneous flame inhibition by alkali metals

Dounia, Omar and Vermorel, Olivier and Jaravel, Thomas and Poinsot, Thierry Time scale analysis of the homogeneous flame inhibition by alkali metals. (2021) Proceedings of the Combustion Institute, 38 (2). 2371-2378. ISSN 1540-7489

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Official URL: https://doi.org/10.1016/j.proci.2020.06.030

Abstract

A time scale analysis of the homogeneous flame inhibition problem is carried out to identify the main param- eters controlling the gas phase chemical interaction of the alkali metal inhibitors with the flame chemistry. First, kinetic sub-models for the interaction of alkali metals with the flame are analyzed to show that a simplified 2-step inhibition cycle can capture the essential features of this interaction. Second, it is shown that this cycle is auto-catalytic, which explains the high efficiency of alkali metals in inhibiting flames even at low concentrations. Third, the time scales associated to this inhibition cycle are linked to the free flame termina- tion time scale via a non-dimensional parameter characterizing the efficiency of an inhibitor at promoting radical scavenging. It is shown that this parameter accounts for the main trends observed in the literature and can also be used to provide estimates for the chemical flame suppression limit.

Item Type:Article
HAL Id:hal-03213032
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Centre Européen de Recherche et Formation Avancées en Calcul Scientifique - CERFACS (FRANCE)
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Deposited On:03 Mar 2021 10:39

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