Contribution à la modélisation et à la simulation numérique de la combustion turbulente pré-mélangée dans des régimes d'interaction chimie-turbulence extrêmes : Prise en compte des écarts à l'hypothèse de flamme mince

Abstract : The present study is devoted to the modeling of turbulent reactive flows. In a first step of the analysis, one-dimensional flames are considered to scrutinize analytically and numerically the characteristics of the propagating flame front. Then, we introduce a new definition for the flamelet thickness that may differ from the laminar flame thickness. Accordingly a generalized and consistent form of the presumed probability density function(PDF) is proposed. The parameters of this PDF depend on the ratio of the Kolmo-gorov length scale to laminar flame thickness. The corresponding developments can be associated with a boundary layer description applied to the turbulent flame in which the thicknesses of the different sub-layers are determined from the sole knowledge of the turbulent Reynolds number Re and Karlovitz number Ka. This description leads to amodeling proposal (i) for the mean reaction rate as well as (ii) for the turbulent scalar flux. The values of all chemical characteristics are calculated from one-dimensional flame susing either the MathematicaTM software or detailed chemical kinetics computations.Numerical simulations are finally performed with the CFD code Code-Saturne and the model is validated through comparisons with reference experimental configurations :turbulent V-shaped flames and impinging flames. Satisfactory results are obtained for these two distinct configurations.
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Kim Quoc Nguyen Kha. Contribution à la modélisation et à la simulation numérique de la combustion turbulente pré-mélangée dans des régimes d'interaction chimie-turbulence extrêmes : Prise en compte des écarts à l'hypothèse de flamme mince. Autre. ISAE-ENSMA Ecole Nationale Supérieure de Mécanique et d'Aérotechique - Poitiers, 2016. Français. ⟨NNT : 2016ESMA0018⟩. ⟨tel-01447576⟩

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