Simulation numérique sur des feux de nappe de kérosène de grande échelle soumis à un vent traversier avec prise en compte d'un aéronef

Abstract : Large fully turbulent fires, which result as a consequence of an aircraft accident, pose asevere hazard to the occupants and cargo. This numerical study focuses on the firephenomenology associated with the presence of an aircraft immersed, at one particularlocation and orientation, within a large aviation-fuel fire in a moving fluid medium.Turbulence is modelled using a standard Smagorinsky sub-grid scale model in a Large EddySimulation An extension of the eddy dissipation concept is incorporated, allowing toinvestigate the roles of the wind speed and its direction on the fire growth, heat fluxdistribution and smoke products, such as carbon monoxide and soot. The outcome of thestudy is interesting, and the interaction model between turbulence and combustion is indeedadequate. A radiative transfer equation is solved by using a discrete expression adapted to afinite volume method. The soot model is based on a Smoke-Point concept, and the mixture ofsoot and gas behaves as a gray medium. The predicted flame shape and heat flux comparewell with the measurements. The prediction indicates that interaction between aircraft and fireenvironment combined with the influence of wind conditions affects dramatically location ofthe continuous flame zone and heat flux distribution. The highest heat flux occurs on thewindward side of the aircraft for the low and medium winds, but on the leeward side of theaircraft for the high wind. A good reproduction of the experimental trends has been achievedfor the temperature field. Preliminary comparisons of the heat flux distribution on the cylinderskin show promise. The peak heat fluxes to the aircraft for various wind conditions rangefrom 200-340 kW/m2, and the contribution of radiation to the aircraft skin is higher than 95%of the total heat flux.
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Guoda Wang. Simulation numérique sur des feux de nappe de kérosène de grande échelle soumis à un vent traversier avec prise en compte d'un aéronef. Autre. ISAE-ENSMA Ecole Nationale Supérieure de Mécanique et d'Aérotechique - Poitiers, 2014. Français. ⟨NNT : 2014ESMA0006⟩. ⟨tel-01011244⟩

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