Virtual chemical mechanisms optimized to capture pollutant formation in turbulent flames

Abstract : The conflicting nature of performance, operability and environmental constraints leads engine manufacturers to perform a fine optimization of the burner geometry to find the best design compromise.Large Eddy Simulation (LES) is an attractive tool to achieve this challenging task, and is routinely used in design office to capture macroscopic flow features.However, the prediction of phenomena influenced by complex kinetic effects, such as flame stabilization, extinction and pollutant formation, is still a crucial issue.Indeed, the comprehensive description of combustion chemistry effects requires the use of detailed models imposing prohibitive computational costs, numerical stiffness and difficulties related to model the coupling with unresolved turbulent scales.Reduced-cost chemistry description strategies must then be proposed to account for kinetic effects in LES of real combustion chambers.In this thesis an original modeling approach, called virtual optimized chemistry, is developed.This strategy aims at describing the chemical flame structure and pollutant formation in relevant flame configurations, at a low computational cost.Virtual optimized kinetic schemes, composed by virtual reactions and virtual species, are built through optimization of both kinetic rate parameters and virtual species thermo-chemical properties so as to capture reference target flame quantity.
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  • HAL Id : tel-02283226, version 1

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Mélody Cailler. Virtual chemical mechanisms optimized to capture pollutant formation in turbulent flames. Chemical and Process Engineering. Université Paris-Saclay, 2018. English. ⟨NNT : 2018SACLC084⟩. ⟨tel-02283226⟩

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