Etude expérimentale et numérique de la cinétique de décomposition thermique de contreplaqués en bois

Abstract : Fire safety relies on the use of numerical simulations. Presently, the available computational codes are composed of different models including a model called pyrolysis's model which describe the thermal decomposition of solids. However, the current models of pyrolysis are sources of multiple errors. The present work proposed the multiscale approach to go step by step in the validation of the model, with taking into account the evolution of thermal, physical and chemical aspects during the decomposition. This research program concerns especially to habitat materials. Two kind of plywoods were characterized experimentally. The thermal decomposition of wood carried out by using two different facilities coupled with various gas analyzers: (1) Thermo-gravimetric analysis, TGA (particle scale) and (2) cone calorimeter (scale material). The relationship between the evolution of the mass loss rates and gaseous emissions allowed to propose a reactions mechanism for thermal decomposition. The reaction rate for each reaction described by considering Arrhenius law. Further, the parameters of kinetics were determined by the method of genetic algorithms. The Comparison between numerical and experimental results on this particle scale (obtained from TGA), showing a good agreement, that mean the pyrolysis model developed is validated and could be performed well for such scale. However, for a larger scale, the modelling of cone calorimeter was carried out by using GPYRO, but the numerical results were not in reasonable agreement with the obtained experimental data.
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Talal Fateh. Etude expérimentale et numérique de la cinétique de décomposition thermique de contreplaqués en bois. Autre. ISAE-ENSMA Ecole Nationale Supérieure de Mécanique et d'Aérotechique - Poitiers, 2011. Français. ⟨tel-00667332⟩

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