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Sur un modèle de combustion en milieu désordonné

Abstract : The propagation of a flame in a disordered reactive medium brings into play so important disparities of length scales that its study remains inaccessible without a great effort of modeling. The analysis presented here relies on the use of percolation concepts by considering the combustion field as a collection of percolation clusters. Specifically, we focus on the combustion of disordered solid fuels for which flames only propagate along a network of preferential paths (or channels) distributed over the medium. Theoretical models are first introduced to study flame propagation through a single channel. They show the existence of flame quenching for too narrow channels and provide a relationship between the latters' width and the curved-flame speed. Good agreements are found with direct numerical simulations. The results so obtained are then used to develop a dynamical model based on bond percolation to characterize flame propagation through disordered reactive media. Various scaling laws are numerically obtained.
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Submitted on : Thursday, February 21, 2008 - 12:44:54 PM
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  • HAL Id : tel-00258217, version 1



Olivier Esnault. Sur un modèle de combustion en milieu désordonné. Energie électrique. ISAE-ENSMA Ecole Nationale Supérieure de Mécanique et d'Aérotechique - Poitiers, 2007. Français. ⟨tel-00258217⟩



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