Transient ignition and combustion of diluted hydrogen/air mixtures by a thin catalytic wire

Treviño, César; Higuera Antón, Francisco y Liñán Martínez, Amable (2002). Transient ignition and combustion of diluted hydrogen/air mixtures by a thin catalytic wire. En: "29 Symposium (International) on Combustion", July 21-26 2002, Sapporo, Japan.

Descripción

Título: Transient ignition and combustion of diluted hydrogen/air mixtures by a thin catalytic wire
Autor/es:
  • Treviño, César
  • Higuera Antón, Francisco
  • Liñán Martínez, Amable
Tipo de Documento: Ponencia en Congreso o Jornada (Artículo)
Título del Evento: 29 Symposium (International) on Combustion
Fechas del Evento: July 21-26 2002
Lugar del Evento: Sapporo, Japan
Título del Libro: 29 Symposium (International) on Combustion
Fecha: 2002
Volumen: 29
Materias:
Palabras Clave Informales: Adsorption; Catalysts; Desorption; Hydrogen; Mixtures; Natural convection; Reaction kinetics; Surface reactions; Thermal effects; Wire; Catalytic wires; Ignition
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 (158kB) | Vista Previa

Resumen

This paper reports on a study of transient ignition and combustion of hydrogen/air mixtures by a heated, thin catalytic wire in a natural convection environment. Modeling of the process is accomplished via a reduced set of heterogeneous kinetic processes which include dissociative adsorption and desorption of both reactants, three fast surface reactions of the Langmiur-Hinshelwood type, and the desorption reaction of the adsorbed product, H2O(s). The overall surface reaction rate is found to be limited by the adsorption rate of molecular oxygen, which depends on the concentration of molecular oxygen close to the surface of the wire and the distribution of empty sites in the catalyst. The analysis allows the determination of the critical conditions for ignition and the ignition delay time as a function of the important physicochemical parameters. The resulting wire temperatures and the critical value of the external heating rate at ignition are computed. The analysis shows how the ignition temperature increases as the external heating rate increases. The configuration dependence of the ignition temperature is taken as an indication that the use of a critical Damköhler number provides a better ignition condition than the ignition temperature concept. A self-sustained combustion regime for strong diluted mixtures is described.

Más información

ID de Registro: 923
Identificador DC: http://oa.upm.es/923/
Identificador OAI: oai:oa.upm.es:923
Depositado por: Archivo Digital UPM
Depositado el: 22 Abr 2009
Ultima Modificación: 20 Abr 2016 06:35
  • 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