Wind-aided flame spread under oblique forced flow

Tizón Pulido, Juan Manuel and Salvá Monfort, José Juan and Liñán Martínez, Amable (1999). Wind-aided flame spread under oblique forced flow. "Combustion and Flame", v. 119 (n. 1-2); pp. 41-55. ISSN 0010-2180. https://doi.org/10.1016/S0010-2180(99)00038-3.

Description

Title: Wind-aided flame spread under oblique forced flow
Author/s:
  • Tizón Pulido, Juan Manuel
  • Salvá Monfort, José Juan
  • Liñán Martínez, Amable
Item Type: Article
Título de Revista/Publicación: Combustion and Flame
Date: October 1999
ISSN: 0010-2180
Volume: 119
Subjects:
Freetext Keywords: Approximation theory; Boundary layers; Flow of fluids; Fuels; Gasification; Pyrolysis; Temperature; Velocity; Wind; Oblique forced flow; Wind aided flame; Combustion; flame; flow mechanics; article; flow rate; gas flow; gravity; priority journal; reaction analysis
Faculty: E.T.S.I. Aeronáuticos (UPM)
Department: Motopropulsión y Termofluidodinámica [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

he wind-aided flame spread process along a solid fuel rod under oblique forced flow is analyzed in absence of gravity or when the forced flow dominates the gravity-induced flow. The transverse velocity is large enough to ensure that mixing of the fuel vapors and air occurs in a thin boundary layer surrounding the fuel rod and we can use the boundary layer approximation to describe the gas-phase chemical reaction and downwind flame spread process. A global, second-order, Arrhenius expression is employed to describe the gas-phase reaction, while the solid surface gasification reaction is modeled in terms of a constant pyrolysis temperature. The solid is heated by the hot gases convected from the flame by the axial component of the velocity in the direction of the flame spread. The solid will be considered thermally thick, assuming the thickness of the heated layer in the solid to be small compared with the rod radius. The analysis determines the flame spread velocity and the flow structure in the flame front region. The analysis also shows that flame spread is not possible at large flow velocities due to finite rate effects, while at low velocities the gas-phase reaction is diffusion-controlled. By including radiation losses from the surface a flame spread limit, at low velocities, is also found in the present analysis. The wind-aided flame spread process along a solid fuel rod under oblique forced flow is analyzed in absence of gravity or when the forced flow dominates the gravity-induced flow. The transverse velocity is large enough to ensure that mixing of the fuel vapors and air occurs in a thin boundary layer surrounding the fuel rod and we can use the boundary layer approximation to describe the gas-phase chemical reaction and downwind flame spread process. A global, second-order, Arrhenius expression is employed to describe the gas-phase reaction, while the solid surface gasification reaction is modeled in terms of a constant pyrolysis temperature. The solid is heated by the hot gases convected from the flame by the axial component of the velocity in the direction of the flame spread. The solid will be considered thermally thick, assuming the thickness of the heated layer in the solid to be small compared with the rod radius. The analysis determines the flame spread velocity and the flow structure in the flame front region. The analysis also shows that flame spread is not possible at large flow velocities due to finite rate effects, while at low velocities the gas-phase reaction is diffusion-controlled. By including radiation losses from the surface a flame spread limit, at low velocities, is also found in the present analysis.

More information

Item ID: 823
DC Identifier: http://oa.upm.es/823/
OAI Identifier: oai:oa.upm.es:823
DOI: 10.1016/S0010-2180(99)00038-3
Official URL: http://www.sciencedirect.com/science/journal/00102180
Deposited by: Archivo Digital UPM
Deposited on: 22 Apr 2009
Last Modified: 20 Apr 2016 06:32
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