A simple one-step chemistry model for partially premixed hydrocarbon combustion

Fernández Tarrazo, Eduardo and Sánchez Pérez, Antonio Luis and Liñán Martínez, Amable and Williams, F.A. (2006). A simple one-step chemistry model for partially premixed hydrocarbon combustion. "Combustion and Flame", v. 147 (n. 1-2); pp. 32-38. ISSN 0010-2180.

Description

Title: A simple one-step chemistry model for partially premixed hydrocarbon combustion
Author/s:
  • Fernández Tarrazo, Eduardo
  • Sánchez Pérez, Antonio Luis
  • Liñán Martínez, Amable
  • Williams, F.A.
Item Type: Article
Título de Revista/Publicación: Combustion and Flame
Date: October 2006
Volume: 147
Subjects:
Freetext Keywords: Arrhenius kinetics; Model chemistry; Partially premixed combustion
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

This work explores the applicability of one-step irreversible Arrhenius kinetics with unity reaction order to the numerical description of partially premixed hydrocarbon combustion. Computations of planar premixed flames are used in the selection of the three model parameters: the heat of reaction q, the activation temperature Ta, and the preexponential factor B. It is seen that changes in q with equivalence ratio φ{symbol} need to be introduced in fuel-rich combustion to describe the effect of partial fuel oxidation on the amount of heat released, leading to a universal linear variation q (φ{symbol}) for φ{symbol} > 1 for all hydrocarbons. The model also employs a variable activation temperature Ta (φ{symbol}) to mimic changes in the underlying chemistry in rich and very lean flames. The resulting chemistry description is able to reproduce propagation velocities of diluted and undiluted flames accurately over the whole flammability limit. Furthermore, computations of methane-air counterflow diffusion flames are used to test the proposed chemistry under nonpremixed conditions. The model not only predicts the critical strain rate at extinction accurately but also gives near-extinction flames with oxygen leakage, thereby overcoming known predictive limitations of one-step Arrhenius kinetics.

More information

Item ID: 856
DC Identifier: http://oa.upm.es/856/
OAI Identifier: oai:oa.upm.es:856
Official URL: http://www.sciencedirect.com/science/journal/00102180
Deposited by: Archivo Digital UPM
Deposited on: 13 Feb 2008
Last Modified: 20 Apr 2016 06:34
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