Numerical investigation of spark-ignition in a laminar methane-air counterflow


Richardson, E.S. and Mastorakos, E. (2005) Numerical investigation of spark-ignition in a laminar methane-air counterflow. In, Selçuk, Nevin , Mansour, Mohy S. and Beretta, Federico (eds.) Selected Papers from the Fourth Mediterranean Combustion Symposium. MCS04: Fourth Mediterranean Combustion Symposium London, GB, Taylor and Francis.

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Description/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.

Item Type: Book Section
Subjects: Q Science > QC Physics
T Technology > TA Engineering (General). Civil engineering (General)
Q Science > QA Mathematics
Divisions: Faculty of Engineering and the Environment > Engineering Sciences
ePrint ID: 203159
Date Deposited: 15 Nov 2011 12:26
Last Modified: 27 Mar 2014 19:47
Publisher: Taylor and Francis
URI: http://eprints.soton.ac.uk/id/eprint/203159

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