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Élaboration d’un outil numérique pour la réduction et l’optimisation des mécanismes cinétiques pour les systèmes de combustion

Abstract : In the modeling of a combustion process, obtention of global data such as flame speed can, under certain circumstances, be achieved through extremely reduced mechanisms. On the contrary, prediction of detailed data such as polluant species requires the use of detailed kinetic mechanisms involving many chemical species. Due to the size and to the presence of many differents time scales, the integration of those models to complex numerical simulations is a non trivial task. A reduction tool based on Directed Relation Graph and sensitivity analysis methods is proposed to tackle this issue. Reduced mechanisms fitting user defined tolerances for quantities of interest such as global (flame speed, ignition delay, etc) and detailed data (concentration profiles) are automatically generated. The reduction process is paired up with an optimisation of reaction rates through a genetic algorithm to make up for the error induced by the loss of information. This process can use both numerical and experimental reference entries. The complete numerical tool has been tested on several canonical configurations for several fuels (methane, ethane and n-heptane) and reduction rates up to 90% have been observed.
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  • HAL Id : tel-02924863, version 1

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Aurélie Delaroque. Élaboration d’un outil numérique pour la réduction et l’optimisation des mécanismes cinétiques pour les systèmes de combustion. Mécanique [physics.med-ph]. Sorbonne Université, 2018. Français. ⟨NNT : 2018SORUS417⟩. ⟨tel-02924863⟩

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