Numerical investigation of spark-ignition in a laminar methane-air counterflow
Numerical investigation of spark-ignition in a laminar methane-air counterflow
Simulations of forced ignition in a non-premixed laminar counterflow are used to study the effect of the strain rate on ignition success. A one dimensional calculation is performed, using detailed methane chemical kinetics, and treating the ignition event as an instantaneous heat release. Ignition success is seen to depend on the mixture composition and spark location, resulting in lean and rich ignitability limits for a given spark that can be different from the nominal flammability limits. Ignition is also prohibited by excessive strain rates, in some cases at levels well below the extinction value. The structure of the evolving ignition region is examined in terms of its temperature, heat release rates and its composition. In the case of successful ignition, the high temperature reached due to the spark energy deposition causes local autoignition. Subsequently, intense burning rapidly consumes the reactants in the remaining region of flammable methane-air mixture. As this intense burning subsides a partially premixed and then a non-premixed diffusion flame are seen to survive.
Richardson, E.S.
a8357516-e871-40d8-8a53-de7847aa2d08
Mastorakos, E.
159653c4-33f6-4f4a-8f79-4751bfd4ba64
October 2005
Richardson, E.S.
a8357516-e871-40d8-8a53-de7847aa2d08
Mastorakos, E.
159653c4-33f6-4f4a-8f79-4751bfd4ba64
Richardson, E.S. and Mastorakos, E.
(2005)
Numerical investigation of spark-ignition in a laminar methane-air counterflow.
Selçuk, Nevin, Mansour, Mohy S. and Beretta, Federico
(eds.)
In Selected Papers from the Fourth Mediterranean Combustion Symposium.
Taylor & Francis..
Record type:
Conference or Workshop Item
(Paper)
Abstract
Simulations of forced ignition in a non-premixed laminar counterflow are used to study the effect of the strain rate on ignition success. A one dimensional calculation is performed, using detailed methane chemical kinetics, and treating the ignition event as an instantaneous heat release. Ignition success is seen to depend on the mixture composition and spark location, resulting in lean and rich ignitability limits for a given spark that can be different from the nominal flammability limits. Ignition is also prohibited by excessive strain rates, in some cases at levels well below the extinction value. The structure of the evolving ignition region is examined in terms of its temperature, heat release rates and its composition. In the case of successful ignition, the high temperature reached due to the spark energy deposition causes local autoignition. Subsequently, intense burning rapidly consumes the reactants in the remaining region of flammable methane-air mixture. As this intense burning subsides a partially premixed and then a non-premixed diffusion flame are seen to survive.
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Richardson_MCS4_text.pdf
- Author's Original
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Published date: October 2005
Venue - Dates:
MCS04: Fourth Mediterranean Combustion Symposium, Lisbon, Portugal, 2005-10-06 - 2005-10-10
Organisations:
Engineering Science Unit
Identifiers
Local EPrints ID: 203159
URI: http://eprints.soton.ac.uk/id/eprint/203159
PURE UUID: 3bd0e73e-4ad1-4eab-9be7-d43e774da354
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Date deposited: 15 Nov 2011 12:26
Last modified: 15 Mar 2024 03:37
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Contributors
Author:
E. Mastorakos
Editor:
Nevin Selçuk
Editor:
Mohy S. Mansour
Editor:
Federico Beretta
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