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Étude numérique de l'allumage diphasique de foyers annulaires multi-brûleurs

Abstract : Ignition is one of the critical issues that arise in the design and dimensioning of aeronautic combustors, in particular when new technologies are envisioned to reduce the amount of pollutants generated by the combustion of fossil fuels. It is therefore important to achieve a detailed understanding of this complex process in realistic conditions in order to enable informed design choices leading to reliable, stable and safe operation of the engines.Large eddy simulations of the light-round with two phase injection are carried out for three operating conditions and compared to experimental data in terms of flame structure and global duration. The liquid phase is described with a mono-disperse Eulerian approach.A detailed analysis of the three numerical light-round sequences allows to identify some key aspects of the flame propagation in the two-phase mixture. Interactions between the flame, the flow field and the liquid sprays create heterogeneities in the liquid repartition and wakes on the downstream side of the swirling jets formed by the injectors, with notable effects on the motion of the leading point and on the absolute flame velocity.Finally, heat losses at the walls are accounted for during the light-round in order to assess the simulation's ability to retrieve the marked slowdown of the flame propagation observed experimentally when the quartz walls are at ambient temperature.
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  • HAL Id : tel-01998191, version 1


Théa Lancien. Étude numérique de l'allumage diphasique de foyers annulaires multi-brûleurs. Autre. Université Paris-Saclay, 2018. Français. ⟨NNT : 2018SACLC072⟩. ⟨tel-01998191⟩



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