Prédiction des mécanismes d’accélération de la combustion dans les atmosphères explosives (EXPRES)

Abstract : This project was led as a relatively wide forum devoted to the physical representation of the flames propagation and to simulation means of explosion effects. In addition to new fundamental knowledge, the analysis of flame acceleration mechanisms provided a mean of investigation of strengths and weaknesses of the simulation methods proposed at present. We showed that instabilities of the combustion are more a reaction of flames to their environment than to initial turbulence of the atmosphere except of course for dust flames (it cannot have a cloud without a signifi cant preliminary level of turbulence). In the two cases, some adapted formulations were proposed and validated: Common Taylor model in the first case and Gülder model in the second one). Regarding simulation tools, the strength of CFD codes is clearly in the acuteness of the flow representation which provides a new mean of flames behavior analysis. However it is not at all obvious that the explosion modeling with CFD be reliable except possibly if the flame propagation is totally driven by the turbulence. There is still no solution to this difficulty even if an attempt was tried with the development by INERIS of a new code called MERLIN. It also appears that phenomenological models may be a credible alternative for the modeling of flame propagation. A large effort was devoted to this topic along the project and a new tool was developed (EXPRES).
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Christophe Proust. Prédiction des mécanismes d’accélération de la combustion dans les atmosphères explosives (EXPRES). Rapport Scientifique INERIS, 2009, 2008-2009, pp.66-68. ⟨ineris-01869250⟩

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