Effects of radiation losses on very lean methane/air flames propagating upward in a vertical tube

Higuera Antón, Fco. Jose y Muntean, Victor (2014). Effects of radiation losses on very lean methane/air flames propagating upward in a vertical tube. "Combustion and Flame", v. 161 (n. 9); pp. 2340-2347. ISSN 0010-2180. https://doi.org/10.1016/j.combustflame.2014.02.013.

Descripción

Título: Effects of radiation losses on very lean methane/air flames propagating upward in a vertical tube
Autor/es:
  • Higuera Antón, Fco. Jose
  • Muntean, Victor
Tipo de Documento: Artículo
Título de Revista/Publicación: Combustion and Flame
Fecha: 2014
Volumen: 161
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

Texto completo

[img]
Vista Previa
PDF (Document Portable Format) - Se necesita un visor de ficheros PDF, como GSview, Xpdf o Adobe Acrobat Reader
Descargar (3MB) | Vista Previa

Resumen

The stationary upward propagation of a very lean methane/air flame in a long vertical tube open at the bottom and closed at the top is simulated numerically using a single overall chemical reaction to model combustion and assuming an optically thin gas and a transparent or non-reflecting tube wall to approximately account for radiation losses from CO2CO2 and H2OH2O. Buoyancy plays a dominant role in the propagation of these flames and causes a large region of low velocity of the burnt gas relative to the flame to appear below the flame front when the equivalence ratio is decreased. The size of this region scales with the radius of the tube, and its presence enhances the effect of radiation losses, which would be otherwise negligible for a standard flammability tube, given the small concentration of radiating species. Heat conduction is found to be important in the low velocity region and to lead to a conduction flux from the flame to the burnt gas that causes extinction at the flame tip for a value of the equivalence ratio near the flammability limit experimentally measured in the standard tube. The effect of radiation losses decreases with the radius of the tube. Numerical results and order-of-magnitude estimates show that, in the absence of radiation, a very lean flame front fails to propagate only after recirculation of the burnt gas extends to its reaction region and drastically changes its structure. This condition is not realized for the standard flammability tube, but it seems to account for the flammability limit measured in a tube of about half the radius of the standard tube.

Proyectos asociados

TipoCódigoAcrónimoResponsableTítulo
Comunidad de MadridS2009/ENE-1957HYSYCOBSin especificarSin especificar
Gobierno de EspañaS2009/ENE-1957Sin especificarSin especificarSin especificar
Gobierno de EspañaDPI-2045-C03-01Sin especificarSin especificarSin especificar

Más información

ID de Registro: 35181
Identificador DC: http://oa.upm.es/35181/
Identificador OAI: oai:oa.upm.es:35181
Identificador DOI: 10.1016/j.combustflame.2014.02.013
URL Oficial: http://www.sciencedirect.com/science/article/pii/S0010218014000728
Depositado por: Memoria Investigacion
Depositado el: 17 Nov 2015 11:21
Ultima Modificación: 17 Nov 2015 11:21
  • Open Access
  • Open Access
  • Sherpa-Romeo
    Compruebe si la revista anglosajona en la que ha publicado un artículo permite también su publicación en abierto.
  • Dulcinea
    Compruebe si la revista española en la que ha publicado un artículo permite también su publicación en abierto.
  • Recolecta
  • e-ciencia
  • Observatorio I+D+i UPM
  • OpenCourseWare UPM