Étude experimentale et theorique des vitesses de flammes laminaires d'hydrocarbures

Abstract : The laminar burning velocity is a key parameter in the combustion of hydrocarbons study. It plays an essential role in the combustion science area since it is used for the validation of numerical models, the design of burners or to predict potential flashback or blow off of the flame. The goal of the thesis was the study of laminar burning velocities of many hydrocarbons found in natural gases, gasolines or diesel fuels. This work includes an experimental part and a modeling part. The experimental part allowed the implementation of the literature database for different air/hydrocarbons mixtures. The experiments were performed with a new apparatus developed at LRGP (Laboratoire Réactions et Génie des Procédés) for the measurement of laminar burning velocities by the heat flux method thanks to a flat flame adiabatic burner. This method is based on balancing of the heat loss required for the flame stabilization by the convective heat flux from the burner surface to the flame front. The burner head is a thick perforated plate included in a plenum mixing chamber and the measurement of the radial distribution of the temperature is performed with a thermocouples series. This apparatus was first used at atmospheric pressure and several temperatures to measure laminar burning velocities of gaseous compounds (alkanes, alkenes, hydrogen-enriched or oxygen-enriched methane, natural gases, methane-ethane and methane-propane mixtures) and liquid compounds (alkanes, ethanol, commercial gasoline and model fuel with addition of ethanol or not, alkylcyclohexanes, alkylbenzènes). The apparatus was then placed in a chamber in order to work under pressures theoretically up to 10 atm. Laminar burning velocities of two compounds were studied at room temperature and high pressure : a gaseous compound, methane, for pressures up to 6 atm and a liquid compound, n-pentane, for pressures up to 4 atm. A modelling study completed this work by using detailed kinetic models for the combustion of studied compounds. These models were tested by the simulation of experimental results previously obtained, in various equivalence ratio, temperature and pressure conditions
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Patricia Dirrenberger. Étude experimentale et theorique des vitesses de flammes laminaires d'hydrocarbures. Autre. Université de Lorraine, 2014. Français. ⟨NNT : 2014LORR0035⟩. ⟨tel-01750738⟩

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