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Communication Dans Un Congrès Année : 2020

Fire plume in a two-layer stratified environment

Résumé

The present work analyses theoretically and numerically fire plumes evolving in a two-layer stratified environment. The ambient fluid consists of a lower cold (heavy) layer and an upper warm (light) layer with a sharp interface. The fire plume is controlled by the fire heat release rate Q. Depending on the density interface location Hl and on the fire source conditions, the fire plume can rise indefinitely or can be captured by the density stratification. To determine a criterion between these two situations, a theoretical model is proposed. With this model, it is found that the trapping/escaping criterion of the fire plume is determined in terms of a stratification parameter lambda> C3 where the constant C3 ≈ 0.88. The stratification parameter is a function of the fire heat release, the density interface location Hl and the ambient stratification. Moreover, the model also allows the plume height to be determined analytically. The comparison with the numerical data shows an excellent agreement.
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Dates et versions

hal-03762469 , version 1 (27-08-2022)

Identifiants

  • HAL Id : hal-03762469 , version 1

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Samuel Vaux, Rabah Mehaddi, Anthony Collin, Pascal Boulet. Fire plume in a two-layer stratified environment. International Association for Fire Safety Science, IAFSS 2020, Apr 2020, WATERLOO, Canada. ⟨hal-03762469⟩
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