Flame flashback and propagation of premixed flames near a wall

Kurdyumov, V. and Fernández Tarrazo, Eduardo and Liñán Martínez, Amable (2000). Flame flashback and propagation of premixed flames near a wall. In: "28 Symposium (International) on Combustion", 30 July 2000 through 4 August 2000, Colorado at Boulder, Boulder, Colorado.

Description

Title: Flame flashback and propagation of premixed flames near a wall
Author/s:
  • Kurdyumov, V.
  • Fernández Tarrazo, Eduardo
  • Liñán Martínez, Amable
Item Type: Presentation at Congress or Conference (Article)
Event Title: 28 Symposium (International) on Combustion
Event Dates: 30 July 2000 through 4 August 2000
Event Location: Colorado at Boulder, Boulder, Colorado
Title of Book: 28 Symposium (International) on Combustion
Date: 2000
Volume: 28
Subjects:
Freetext Keywords: Approximation theory; Boundary layers; Combustion; Fuels; Heat conduction; Laminar flow; Thermal diffusion; Flame propagation; Flame research
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

The flashback or propagation of premixed flames along the near-wall low-velocity region at the base of a laminar boundary layer of a reactive mixture has been studied numerically. The analysis, carded out using the constant density approximation for an Arrhenius overall reaction, accounts for the effects of the Lewis number of the fuel. The flow field, as seen by an observer moving with file front, includes the unknown flame front velocity U relative to the wall and the linear velocity gradient A at the base of the boundary layer. Due to this gradient, the flame front is curved with a radius of curvature lF = SL/A, proportional to the planar flame velocity SL. The front velocity is changed from SL by a factor which depends on the Karlovitz number, or non-dimensional wall velocity gradient, defined as the ratio between the thickness of the planar flame and the front curvature lF. The front velocity has been calculated in the limiting cases of adiabatic and isothermal walls. The front velocity changes from negative to positive when the Karlovitz number decreases below a critical value, determining the onset of flashback. This critical value, which decreases when the Lewis number of the fuel increases, is smaller for isothermal than for adiabatic walls. In this second case, when the flame is not quenched close to the wall, flashback is prevented by flame stretch associated with flame curvature.

More information

Item ID: 919
DC Identifier: http://oa.upm.es/919/
OAI Identifier: oai:oa.upm.es:919
Deposited by: Archivo Digital UPM
Deposited on: 26 Mar 2008
Last Modified: 20 Apr 2016 06:35
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