Asymptotic analysis of n-heptane ignition and cool flames with a temperature-explicit model

Liñán Martínez, Amable y Williams, F.A. (1996). Asymptotic analysis of n-heptane ignition and cool flames with a temperature-explicit model. "Combustion Science and Technology,", v. 113-11 ; pp. 81-107. ISSN 0010-2202.

Descripción

Título: Asymptotic analysis of n-heptane ignition and cool flames with a temperature-explicit model
Autor/es:
  • Liñán Martínez, Amable
  • Williams, F.A.
Tipo de Documento: Artículo
Título de Revista/Publicación: Combustion Science and Technology,
Fecha: 1996
Volumen: 113-11
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

An empirical four-step mechanism has previously been proposed for describing ignition of heptane-air mixtures. This mechanism captures the low-temperature and high-temperature ignition behavior as well as the intermediate-temperature behavior, between roughly 800 K and 1100 K, where a negative temperature dependence of the overall rate is observed. The present paper derives simplified overall rate formulas for ignition times from this four-step mechanism and uses those formulas to derive a temperature-explicit model whose simplicity facilitates analysis of more complex ignition phenomena. Methods of activation-energy asymptotics are employed for the temperature-explicit model to investigate ignition in homogeneous, adiabatic systems, ignition by compressional heating in homogeneous systems, and structures and quasisteady propagation velocities of cool flames in weakly strained mixing layers. It is shown that, in the range of negative temperature dependence, there is a plateau in the ignition time when the criterion of thermal runaway is employed. Near this plateau region, cool flames with three-zone structures can propagate at velocities that increase with increasing initial temperature. Besides providing qualitative descriptions of ignition processes for hydrocarbon-air mixtures, the results lead to quantitative predictions that can be compared with experiment.

Más información

ID de Registro: 1354
Identificador DC: http://oa.upm.es/1354/
Identificador OAI: oai:oa.upm.es:1354
Depositado por: Biblioteca ETSI Aeronauticos
Depositado el: 30 Ene 2009
Ultima Modificación: 20 Abr 2016 06:48
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