An asymptotic analysis of undesteady diffusion flames for large activation energies

Liñán Martínez, Amable y Crespo Martínez, Antonio (1972). An asymptotic analysis of undesteady diffusion flames for large activation energies. Monografía (Informe Técnico). E.T.S.I. Aeronáuticos (UPM) [antigua denominación], Madrid.

Descripción

Título: An asymptotic analysis of undesteady diffusion flames for large activation energies
Autor/es:
  • Liñán Martínez, Amable
  • Crespo Martínez, Antonio
Tipo de Documento: Monográfico (Informes, Documentos de trabajo, etc) (Informe Técnico)
Fecha: 1972
Materias:
Escuela: E.T.S.I. Aeronáuticos (UPM) [antigua denominación]
Departamento: Motopropulsión y Termofluidodinámica [hasta 2014]
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

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.

Más información

ID de Registro: 2233
Identificador DC: http://oa.upm.es/2233/
Identificador OAI: oai:oa.upm.es:2233
Depositado por: Biblioteca ETSI Aeronauticos
Depositado el: 12 Feb 2010 11:32
Ultima Modificación: 20 Abr 2016 11:59
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