Spark ignition of turbulent recirculating non-premixed gas and spray flames: a model for predicting ignition probability
Spark ignition of turbulent recirculating non-premixed gas and spray flames: a model for predicting ignition probability
A model that synthesizes previous knowledge from experiments and simulations on spark ignition of gas and liquid-fuelled non-premixed recirculating flames has been developed. Attention is focused on the flame expansion process and the overall filling of the combustor volume with flame. The model is meant to provide a quick assessment of the ignition behaviour of a combustor. It uses information from the flow patterns before ignition and calculates possible trajectories that a flame emanating from a spark may experience. The calculation of these trajectories includes flame extinction to capture the experimentally- observed flame quenching, mixture fraction fluctuations to capture the non-premixed nature of the flame, convection by the mean and the random turbulent flow to capture the probabilistic nature of the flame evolution, and uses recent results on the laminar burning velocity in sprays. The model is applied to gas and spray flames and the calculated ignition probability distributions and the timescale of complete ignition agree reasonably well with experiment. The results of the model provide insights into spark ignition processes in complicated flow patterns.
1503-1522
Neophytou, A.
e6e33a6b-5440-4352-87f1-eccee3ae6272
Richardson, E.S.
a8357516-e871-40d8-8a53-de7847aa2d08
Mastorakos, E.
159653c4-33f6-4f4a-8f79-4751bfd4ba64
April 2012
Neophytou, A.
e6e33a6b-5440-4352-87f1-eccee3ae6272
Richardson, E.S.
a8357516-e871-40d8-8a53-de7847aa2d08
Mastorakos, E.
159653c4-33f6-4f4a-8f79-4751bfd4ba64
Neophytou, A., Richardson, E.S. and Mastorakos, E.
(2012)
Spark ignition of turbulent recirculating non-premixed gas and spray flames: a model for predicting ignition probability.
Combustion and Flame, 159 (4), .
(doi:10.1016/j.combustflame.2011.12.015).
Abstract
A model that synthesizes previous knowledge from experiments and simulations on spark ignition of gas and liquid-fuelled non-premixed recirculating flames has been developed. Attention is focused on the flame expansion process and the overall filling of the combustor volume with flame. The model is meant to provide a quick assessment of the ignition behaviour of a combustor. It uses information from the flow patterns before ignition and calculates possible trajectories that a flame emanating from a spark may experience. The calculation of these trajectories includes flame extinction to capture the experimentally- observed flame quenching, mixture fraction fluctuations to capture the non-premixed nature of the flame, convection by the mean and the random turbulent flow to capture the probabilistic nature of the flame evolution, and uses recent results on the laminar burning velocity in sprays. The model is applied to gas and spray flames and the calculated ignition probability distributions and the timescale of complete ignition agree reasonably well with experiment. The results of the model provide insights into spark ignition processes in complicated flow patterns.
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Published date: April 2012
Organisations:
Faculty of Engineering and the Environment
Identifiers
Local EPrints ID: 333624
URI: http://eprints.soton.ac.uk/id/eprint/333624
ISSN: 0010-2180
PURE UUID: e5cd3b98-b32f-406d-9eb7-a2bebde78b54
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Date deposited: 06 Mar 2012 13:51
Last modified: 15 Mar 2024 03:37
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Author:
A. Neophytou
Author:
E. Mastorakos
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