Contribution à l'étude de l'usage du brouillard d'eau dans la lutte contre les incendies en tunnels ventilés longitudinalement

Abstract : This mostly experimental study is based on tests conducted in small scale. The study parameters are : the type of fuel (pool fire, wood crib and pallet stacks), the ventilation velocity (below and above the critical velocity), the triggering or not of the water mist system and it's dividing in sectors. In the end, this study provided information on the effect of sprinkling on the intrinsic heat release rate of the fire, the smoke stratification and the thermal tolerable zones in the tunnel. By analysing the ventilation strategy and it's linkage with the sprinkling, a clear improvement of the efficiency of the water mist at low ventilation speed has been demonstrated, and this despite the increase of heat release rate due to the confinement. Moreover, a part of this work has been devoted to reasoning on a synthesis of the scale relations for the gas flow, fire's heat release rate and water mist characteristics, relations that have to be respected when using a small scale apparatus. Eventually a research has been conducted on the influence of a water mist on the opacity of smoke, quantifying the optical extinction of the smokes loaded with water droplets.
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Submitted on : Thursday, January 13, 2011 - 1:46:11 PM
Last modification on : Thursday, March 7, 2019 - 3:08:06 PM
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Raphaël Meyrand. Contribution à l'étude de l'usage du brouillard d'eau dans la lutte contre les incendies en tunnels ventilés longitudinalement. Sciences de l'ingénieur [physics]. ISAE-ENSMA Ecole Nationale Supérieure de Mécanique et d'Aérotechique - Poitiers, 2009. Français. ⟨tel-00554721⟩

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