A bifurcation analysis of high-temperature ignition of H2-O2 diffusion flames

Sánchez Pérez, Antonio Luis; Liñán Martínez, Amable y Williams, F.A. (1994). A bifurcation analysis of high-temperature ignition of H2-O2 diffusion flames. En: "Symposium (International) on Combustion (25. 1994. Irvine, California)", 31 Jul - 5 Ago 1994, Irvine, California. ISBN 0082-0784.

Descripción

Título: A bifurcation analysis of high-temperature ignition of H2-O2 diffusion flames
Autor/es:
  • Sánchez Pérez, Antonio Luis
  • Liñán Martínez, Amable
  • Williams, F.A.
Tipo de Documento: Ponencia en Congreso o Jornada (Artículo)
Título del Evento: Symposium (International) on Combustion (25. 1994. Irvine, California)
Fechas del Evento: 31 Jul - 5 Ago 1994
Lugar del Evento: Irvine, California
Título del Libro: Twenty-Fifth Symposium (International) on Combustion
Fecha: 1994
ISBN: 0082-0784
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 form of the ignition branch for steady, counterflow, hydrogen-oxygen diffusion flames, with dilution permitted in both streams, is investigated for two-step reduced chemistry by methods of bifurcation theory. Attention is restricted to fuel-stream temperatures less than or equal to the oxidizer-stream temperature Tx and to T„ larger than or of the order of the crossover temperature Tc at which the rates of production and consumption of H atoms are equal. Two types of solutions are identified, a frozen solution that always exists in this kinetic approximation because all rates are proportional to the concentration of the intermedíate H atom, and an ignited solution, represented by a branch of the curve giving the máximum H concentration in terms of a Damkohler number constructed from the strain rate and the rate of the branching step H + Os - OH + O. For T„ > T„ the latter bifurcates from the frozen solution if the Damkohler number is increased to a critical valué. For T„ larger than a valué Ts > Tc, the effeets of chemical heat reléase are small, and ignition is always gradual in the sense that the limiting ignited-branch slope is positive (supercritical bifurcation) and there is no S curve. For T„ in the range Tc< T„ < T„ the heat reléase associated with the radical-consumption step causes the limiting ignition-branch slope to become negative (subcritical bifurcation), producing abrupt ignition which leads to an S curve. For valúes of Tx below crossover, the ignited branch appears as a C-shaped curve unconnected to the frozen solution. The method of analysis introduced here offers a first step toward analytical description of nonpremixed H2-02 autoignition.

Más información

ID de Registro: 1295
Identificador DC: http://oa.upm.es/1295/
Identificador OAI: oai:oa.upm.es:1295
Depositado por: Biblioteca ETSI Aeronauticos
Depositado el: 12 Ene 2009
Ultima Modificación: 20 Abr 2016 06:46
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