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Modélidation de la combustion diluée par tabulation de la cinétique chimique

Abstract : This thesis is within a framework of the CANOE project, under the responsibility of GDF SUEZ and the ADEME, and aims at studying the feasibility of the flameless combustion regime in industrial boilers. It is now well established that reactants preheating allows an improvement on thermal efficiency as well as fuel savings. To avoid an increase in nitrogen oxides emissions arising from reactants temperature augmentation, massive dilution of the reactants by burnt gases can be used. While doing so, hot spots are averted and temperature gradients are smoothed: it’s the principle of flameless combustion. Even though this combustion regime is a subject of increasing interest to the industry, its mechanisms are not yet fully understood. The objective of this work is to develop and validate a new turbulent combustion model adapted to this kind of regimes. Complex chemistry as well as heat losses control is of paramount importance in the establishment and stabilization of the flameless combustion process. Here, these effects are taken into account in an FPV-type chemistry tabulation approach. To discriminate the effects associated with evolutions along the database control parameters, we analyze laminar flame responses to different levels of dilution and heat losses. Moreover, we assess the importance of high-order tabulations, and predictive capabilities of our approaches are highlighted. Then, large-eddy simulations of laboratory scale experiments (an adiabatic and a cooled wall configuration) are carried out. To this end, we compare databases featuring different number of dimensions to experimental data on temperature and species distributions available in the literature. Simulation results are in very good agreement with experimental data for complex tabulations, while discrepancies arise for lower order tabulations. Simulation results show that flameless combustion features a wide variety of flame structures, and that our models are able to tackle realistic flame structures.
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Jean Lamouroux. Modélidation de la combustion diluée par tabulation de la cinétique chimique. Autre. Ecole Centrale Paris, 2013. Français. ⟨NNT : 2013ECAP0028⟩. ⟨tel-00905523⟩

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