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Stratification thermique et optique d'un environnement enfumé et interactions eau/fumée sous aspersion

Abstract : This work was devoted to the study of water/smoke interactions in the case of water mist activation on a smoke layer. The aim was to investigate the effects observed on thermal and optical properties when injecting water particles using sprinkler or water mist devices through a smoke layer generated with an heptane pool fire. A first review was reported in order to highlight the researches devoted to water aspersion for firefighting and the smoke stratification phenomena. An experimental study based on 50 runs at real scale was presented, involving optical and thermal measurements. In particular, a laser opacimeter system was developed, which allowed measuring the smoke opacity and the effects of smoke/water interactions on opacity and visibility. Afterwards, a numerical study was conducted. On the one hand fire tests were simulated using the FDS 6th version (Fire Dynamics Simulator) and on the other hand a dedicated code allowed us to evaluate the visibility. The values of the soot and droplet concentrations were extracted from FDS and used into the code dedicated to visibility to calculate the optical properties of the corresponding absorbing-scattering environment. Those properties are then used in a Monte Carlo approach combined with PSF (Point Spread Function) and MTF (Modulation Transfer Function) methods to evaluate the intensity and the contrast of reconstructed images. The destratification effects based on thermal and optical criteria were compared experimentally and numerically for each technology.
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Submitted on : Thursday, March 29, 2018 - 1:29:35 PM
Last modification on : Friday, April 22, 2022 - 2:57:23 PM


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  • HAL Id : tel-01751966, version 1



Romain Morlon. Stratification thermique et optique d'un environnement enfumé et interactions eau/fumée sous aspersion. Autre. Université de Lorraine, 2015. Français. ⟨NNT : 2015LORR0138⟩. ⟨tel-01751966⟩



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