Numerical simulation of the upward propagation of a flame in a vertical tube filled with a very lean mixture.

Higuera Antón, Francisco (2011). Numerical simulation of the upward propagation of a flame in a vertical tube filled with a very lean mixture.. "Combustion and Flame", v. 158 (n. 5); pp. 885-892. ISSN 0010-2180. https://doi.org/10.1016/j.combustflame.2011.01.017.

Descripción

Título: Numerical simulation of the upward propagation of a flame in a vertical tube filled with a very lean mixture.
Autor/es:
  • Higuera Antón, Francisco
Tipo de Documento: Artículo
Título de Revista/Publicación: Combustion and Flame
Fecha: Mayo 2011
Volumen: 158
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

Upwardpropagation of a premixed flame in averticaltubefilled with a very leanmixture is simulated numerically using a single irreversible Arrhenius reaction model with infinitely high activation energy. In the absence of heat losses and preferential diffusion effects, a curved flame with stationary shape and velocity close to those of an open bubble ascending in the same tube is found for values of the fuel mass fraction above a certain minimum that increases with the radius of the tube, while the numerical computations cease to converge to a stationary solution below this minimum mass fraction. The vortical flow of the gas behind the flame and in its transport region is described for tubes of different radii. It is argued that this flow may become unstable when the fuel mass fraction is decreased, and that this instability, together with the flame stretch due to the strong curvature of the flame tip in narrow tubes, may be responsible for the minimum fuel mass fraction. Radiation losses and a Lewis number of the fuel slightly above unity decrease the final combustion temperature at the flame tip and increase the minimum fuel mass fraction, while a Lewis number slightly below unity has the opposite effect.

Más información

ID de Registro: 11359
Identificador DC: http://oa.upm.es/11359/
Identificador OAI: oai:oa.upm.es:11359
Identificador DOI: 10.1016/j.combustflame.2011.01.017
Depositado por: Memoria Investigacion
Depositado el: 30 Jul 2012 11:09
Ultima Modificación: 20 Abr 2016 19:27
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