An asymptotic analysis of undesteady diffusion flames for large activation energies

Liñán Martínez, Amable and Crespo Martínez, Antonio (1972). An asymptotic analysis of undesteady diffusion flames for large activation energies. Monografía (Technical Report). E.T.S.I. Aeronáuticos (UPM), Madrid.

Description

Title: An asymptotic analysis of undesteady diffusion flames for large activation energies
Author/s:
  • Liñán Martínez, Amable
  • Crespo Martínez, Antonio
Item Type: Monograph (Technical Report)
Date: 1972
Subjects:
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 limit of large activation energy is studied for the process of simultaneous mixing and chemical reaction of two reactants undergoing a one-step irreversible Arrhenius reaction. Consideration is restricted to problems of the evolution type ike unsteady mixing and boundary-layer combustion for which the solution is uniquely determined in terms of the initial conditions. The continuous transition from the nearly-frozen to the near-equilibrium regimes is described. The analysis uncovers the existence of: i) An ignition regime, in which a mixing layer develops with only minor effects of the chemical reaction, until a thermal runaway occurs somewhere within the mixing region ; at this location chemical equilibrium then is established rapidly. ii) A deflagration regime, in which premixed flames originate from the ignition point and move through the mixing region to burn completely the reactant not in excess. And iii) a diffusion flame regime, in-which a thin diffusion flame, that is established when the deflagration wave crosses the surface where the reactants are present in stoichiometric proportions, consumes the excess reactants that could not be burned by the premixed flame. This is accomplished by a process in which the reactants diffuse through a thick layer of reaction products. There exists experimental evidence to support this rather complex picture deduced theoretically.

More information

Item ID: 2233
DC Identifier: http://oa.upm.es/2233/
OAI Identifier: oai:oa.upm.es:2233
Deposited by: Biblioteca ETSI Aeronauticos
Deposited on: 12 Feb 2010 11:32
Last Modified: 20 Apr 2016 11:59
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