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Etude expérimentale des concentrations de suie et des vitesses dans une flamme de paroi verticale

Abstract : The fire growth and spread on a confined space depends on the inflammation and combustion of combustible materials. An important case is the fire propagation on a vertical wall configuration, in which the pyrolysis gas and the total heat flux released by the flame are coupled by convective and radiative heat flux from the flame to the wall. This kind of flame is piloted by the buoyancy forces, and is characterized by a low velocity regime and a strong generation of soot particles. Although numerous works have been devoted on the study of vertical wall flames, few have been carried out on the analysis of the flame within the reactive boundary layer and the study of the zones of production of soot particles, which is data necessary for fire simulation codes validation. In this aim, simultaneous measurements of velocity by Particle Image Velocity (PIV) and of soot volume fraction by planar laser induced incandescence (LII) have been carried out on vertical wall fire generated by a vertical porous burner fed with a CH4/C2H4 mixture. First, the characteristics of soot sheet (shape, size, thickness, and peak concentration) have been studied at different heights into the flame, as well as the average and RMS soot volume fraction fields. Then, average and RMS fields of velocity and their probability density function have been analyzed. A description of the reactive boundary layer, through the definition of a characteristic velocity scale in the near-wall zone (viscous sub-layer), has been carried out by using a « PIV Zoom » set-up. Finally, simultaneous LII/PIV measurements have been carried out in order to study the influence of the aerodynamics of the flow on the soot volume fraction distribution, as well as the transport and turbulent flux of soot into the reactive boundary layer.
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Andres Valencia Correa. Etude expérimentale des concentrations de suie et des vitesses dans une flamme de paroi verticale. Mécanique des fluides [physics.class-ph]. Normandie Université, 2017. Français. ⟨NNT : 2017NORMR059⟩. ⟨tel-01693070⟩

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