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Impact of the chemical description on Direct Numerical Simulation and Large Eddy Simulation of turbulent combustion in industrial aero-engines

Abstract : A growing need for numerical simulations based on reliable chemistries has been observed in the last years in order to develop new technologies which could guarantee the reduction of the enviromental impact on air transport. The description of combustion requires the use of detailed kinetic mechanisms for most hydrocarbons. Their use in turbulent combustion simulation is still prohibitive because of their high computational cost. Reduced chemistries and tabulation methods have been proposed to overcome this problem. Since all these reductions have been developed for laminar configurations, this thesis proposes to evaluate their performances in simulations of turbulent configurations such as a DNS of a premixed Bunsen methane/air flame and a LES of an experimental PRECCINSTA burner. The mechanisms are analysed in terms of flame structure, global burning parameters, flame length, prediction of major species concentrations and pollutant emissions. An a priori methodology based on one-dimensional unstrained and strained laminar flames to evaluate the mechanism capability to predict three-dimensional turbulent flame features is therefore proposed. On the one hand when building a new reduced scheme, its requirements should be fixed compromising the computational cost, the robustness of the chemical description and the desired quality of results. On the other hand, the quality of DNS or LES results in three-dimensional configurations could be anticipated testing the reduced mechanism on laminar one-dimensional premixed unstrained and strained flames.
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Contributor : Benedetta Giulia Franzelli <>
Submitted on : Wednesday, January 25, 2012 - 11:28:51 AM
Last modification on : Tuesday, January 6, 2015 - 9:35:21 AM
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Benedetta Giulia Franzelli. Impact of the chemical description on Direct Numerical Simulation and Large Eddy Simulation of turbulent combustion in industrial aero-engines. Mechanics of the fluids [physics.class-ph]. Institut National Polytechnique de Toulouse - INPT, 2011. English. ⟨tel-00662813⟩

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