The role of unequal diffusivities in ignition and extinction fronts in strained mixing layers

Daou, J. y Liñán Martínez, Amable (1998). The role of unequal diffusivities in ignition and extinction fronts in strained mixing layers. "Combustion Theory and Modelling", v. 2 ; pp. 449-477. ISSN 1364-7830.

Descripción

Título: The role of unequal diffusivities in ignition and extinction fronts in strained mixing layers
Autor/es:
  • Daou, J.
  • Liñán Martínez, Amable
Tipo de Documento: Artículo
Título de Revista/Publicación: Combustion Theory and Modelling
Fecha: 11 Mayo 1998
Volumen: 2
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

We have studied flame propagation in a strained mixing layer formed between a fuel stream and an oxidizer stream, which can have different initial temperatures. Allowing the Lewis numbers to deviate from unity, the problem is first formulated within the framework of a thermo-diffusive model and a single irreversible reaction. A compact formulation is then derived in the limit of large activation energy, and solved analytically for high values of the Damkohler number. Simple expressions describing the flame shape and its propagation velocity are obtained. In particular, it is found that the Lewis numbers affect the propagation of the triple flame in a way similar to that obtained in the studies of stretched premixed flames. For example, the flame curvature determined by the transverse enthalpy gradients in the frozen mixing layer leads to flame-front velocities which grow with decreasing values of the Lewis numbers. The analytical results are complemented by a numerical study which focuses on preferentialdiffusion effects on triple flames. The results cover, for different values of the fuel Lewis number, a wide range of values of the Damkohler number leading to propagation speeds which vary from positive values down to large negative values.

Más información

ID de Registro: 1305
Identificador DC: http://oa.upm.es/1305/
Identificador OAI: oai:oa.upm.es:1305
URL Oficial: http://www.tandf.co.uk/journals/titles/13647830.asp
Depositado por: Biblioteca ETSI Aeronauticos
Depositado el: 18 Ene 2009
Ultima Modificación: 20 Abr 2016 06:46
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