Fast, non-diffusive ignition of a gaseous reacting mixture subject to a point energy source

Vázquez Espí, Carlos and Liñán Martínez, Amable (2001). Fast, non-diffusive ignition of a gaseous reacting mixture subject to a point energy source. "Combustion Theory and Modelling", v. 5 ; pp. 485-498. ISSN 1364-7830.

Description

Title: Fast, non-diffusive ignition of a gaseous reacting mixture subject to a point energy source
Author/s:
  • Vázquez Espí, Carlos
  • Liñán Martínez, Amable
Item Type: Article
Título de Revista/Publicación: Combustion Theory and Modelling
Date: 2001
ISSN: 1364-7830
Volume: 5
Subjects:
Faculty: E.T.S.I. Aeronáuticos (UPM)
Department: Motopropulsión y Termofluidodinámica [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The ignition of a gaseous reactive mixture subject to a localized energy source is analysed using large activation energy asymptotics. The energy released by the source results in a thermal non-uniformity in a small región of the gas. We distinguish two different regimes, on-diffusive and diffusive, depending on the dominant cooling mechanism during the ignition stage: expansión effects or heat conduction. We focus on the non-diffusive ignition, considering the energy source as instantaneous. We show the existence of a critical valué of a Damkohler number, defined as the ratio of the characteristic times of the expansión waves and chemical reaction, such that ignition only occurs for supercritical valúes at a well-defined ignition time, which is calculated numerically. The ignition process for a non-instantaneous energy source is also described in terms of an initial inert heating stage and a shorter reactive stage ending in thermal runaway for supercritical valúes of the Damkohler number.

More information

Item ID: 1310
DC Identifier: http://oa.upm.es/1310/
OAI Identifier: oai:oa.upm.es:1310
Official URL: http://www.tandf.co.uk/journals/titles/13647830.asp
Deposited by: Biblioteca ETSI Aeronauticos
Deposited on: 19 Jan 2009
Last Modified: 20 Apr 2016 06:46
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