Comptes Rendus
Microgravity and Transfers/Combustion, chemical reactivity
Different spreading regimes of spray-flames
Comptes Rendus. Mécanique, Volume 332 (2004) no. 5-6, pp. 387-396.

We present a minimal model of spray combustion to investigate a flame front propagating through a fuel-lean mixture of fuel vapor, droplets and air. The model relies on a main control parameter, Da, named the Damkoehler number, which allows us to take into account a large variety of fuel sprays. Numerical results reveal, as a function of Da, a wide range of spray-flame structures, including the classical gaseous premixed flame, a specific regime controlled by vaporisation, and a pulsating mode of propagation. The latter appears when the vaporisation is smaller than (or equal to) the reaction time, and it occurs even with a unit Lewis number.

Un modéle minimal pour la combustion des brouillards est présenté. Il permet d'étudier la propagation d'une flamme à travers un milieu pauvre en hydrocarbure, constitué de vapeur, de gouttelettes et d'air. Il met en évidence, comme paramètre principal, le nombre de Damkoehler (Da), dont la variation nous permet d'étudier de nombreuses configurations de combustion des brouillards. Les résultats numériques font apparaı̂tre plusieurs régimes de flammes : le classique mode de propagation des flammes de prémélange gazeux, un régime spécifique contrôlé par l'évaporation et un mode de propagation pulsant. Ce dernier apparaı̂t lorsque le taux d'évaporation est supérieur ou égal au taux de réaction chimique (Da⩽O(1)), et ce, même quand le nombre de Lewis vaut un.

Published online:
DOI: 10.1016/j.crme.2004.02.004
Keywords: Combustion, Spray combustion, Vaporisation, Pulsating flames
Mot clés : Combustion, Combustion des brouillards, Evaporation, Flammes pulsantes

Sylvain Suard 1; Pierre Haldenwang 1; Colette Nicoli 1

1 Modélisation et simulation numérique en mécanique, FRE 2405 du CNRS, IMT/La Jetée/L3M, 38, avenue Joliot Curie, 13451 Marseille cedex 20, France
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Sylvain Suard; Pierre Haldenwang; Colette Nicoli. Different spreading regimes of spray-flames. Comptes Rendus. Mécanique, Volume 332 (2004) no. 5-6, pp. 387-396. doi : 10.1016/j.crme.2004.02.004. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2004.02.004/

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