Étude de la combustion d’un mélange pyrotechnique fuel/comburant

Abstract : In the last years, energetic materials have been regularly involved in explosions and fire events. They react very rapidly and release large amounts of energy. Their main peculiarity stems from the oxidiser present in their composition, so they do not require oxygen from the air as their primary reaction partner. The thermal and chemical characterisation of such compounds is fundamental to understand their combustion behaviour and then becomes able to prevent severe hazards. A methodology based on combining a thermal analysis and calorimetry tests carried out using a Fire Propagation Apparatus enabled to determine an overall description of the physical and chemical mechanisms taking place during the combustion of sample energetic materials. The analysis showed that both the concentration in oxidizer and the composition of the reactive atmosphere influence the combustion regime that prevails. Understanding the decomposition and oxidizing processes occurring during the different combustion regimes is critical to predict potential toxic emissions. Another essential parameter for the characterisation of a fire scenario involving energetic materials is the Heat Release Rate (HRR). The use two calorimetric methods, Oxygen Consumption and Carbon Dioxide Generation principles, allowed the calculation of the HRR from the burning of the sample material. Nevertheless, a correction procedure based on the use of a fictitious molecule model and an estimation of the heat of reaction needs to be applied to account for the internal supply originating from the oxidizer.
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Hubert Biteau, Guy Marlair. Étude de la combustion d’un mélange pyrotechnique fuel/comburant. Rapport Scientifique INERIS, 2010, 2009-2010, pp.79-81. ⟨ineris-01869283⟩

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