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The temperature dependence of the laminar burning velocity of ethanol flames

Konnov, Alexander LU ; Meuwissen, R. J. and de Goey, L. P. H. (2011) In Proceedings of the Combustion Institute 33. p.1011-1019
Abstract
The Heat Flux method was extended for the first time towards liquid fuels and used to determine burning velocities under conditions when the net heat loss from the flame to the burner is zero. Non-stretched flames were stabilized on a perforated plate burner at 1 atm. Uncertainties of the measurements were analyzed and assessed experimentally. The overall accuracy of the burning velocities was estimated to be better than +/- 1 cm/s. Excellent reproducibility of the experiments over an extended period of time was demonstrated. Measurements of the adiabatic burning velocity of ethanol + air flames in the range of initial mixture temperatures from 298 to 358 K are presented. Experimental results are in a good agreement with the recent... (More)
The Heat Flux method was extended for the first time towards liquid fuels and used to determine burning velocities under conditions when the net heat loss from the flame to the burner is zero. Non-stretched flames were stabilized on a perforated plate burner at 1 atm. Uncertainties of the measurements were analyzed and assessed experimentally. The overall accuracy of the burning velocities was estimated to be better than +/- 1 cm/s. Excellent reproducibility of the experiments over an extended period of time was demonstrated. Measurements of the adiabatic burning velocity of ethanol + air flames in the range of initial mixture temperatures from 298 to 358 K are presented. Experimental results are in a good agreement with the recent literature data obtained in constant volume bombs. Both the ethanol combustion mechanism of Saxena and Williams and the Konnov mechanism significantly over-predict ethanol laminar burning velocities in lean and near-stoichiometric mixtures. The effects of initial temperature on the adiabatic laminar burning velocities of ethanol were interpreted using the correlation S-L = S-L0 (T/T-0)(alpha). Particular attention was paid to the variation of the power exponent alpha with equivalence ratio at atmospheric pressure. Experimental data and proposed empirical expressions for alpha as a function of equivalence ratio were summarized. They were compared with the predictions of detailed kinetic models. The existence of a minimum in alpha in the slightly rich mixtures is demonstrated experimentally and confirmed computationally. (C) 2010 The Combustion Institute. Published by Elsevier Inc. All rights reserved. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Ethanol, Burning velocity, Temperature dependence
in
Proceedings of the Combustion Institute
volume
33
pages
1011 - 1019
publisher
Elsevier
external identifiers
  • wos:000285780200108
  • scopus:78650868744
ISSN
1540-7489
DOI
10.1016/j.proci.2010.06.143
language
English
LU publication?
yes
id
4f623162-721e-4a35-be17-fc4656fbfbea (old id 1870193)
date added to LUP
2011-04-18 13:14:44
date last changed
2017-05-21 03:05:30
@article{4f623162-721e-4a35-be17-fc4656fbfbea,
  abstract     = {The Heat Flux method was extended for the first time towards liquid fuels and used to determine burning velocities under conditions when the net heat loss from the flame to the burner is zero. Non-stretched flames were stabilized on a perforated plate burner at 1 atm. Uncertainties of the measurements were analyzed and assessed experimentally. The overall accuracy of the burning velocities was estimated to be better than +/- 1 cm/s. Excellent reproducibility of the experiments over an extended period of time was demonstrated. Measurements of the adiabatic burning velocity of ethanol + air flames in the range of initial mixture temperatures from 298 to 358 K are presented. Experimental results are in a good agreement with the recent literature data obtained in constant volume bombs. Both the ethanol combustion mechanism of Saxena and Williams and the Konnov mechanism significantly over-predict ethanol laminar burning velocities in lean and near-stoichiometric mixtures. The effects of initial temperature on the adiabatic laminar burning velocities of ethanol were interpreted using the correlation S-L = S-L0 (T/T-0)(alpha). Particular attention was paid to the variation of the power exponent alpha with equivalence ratio at atmospheric pressure. Experimental data and proposed empirical expressions for alpha as a function of equivalence ratio were summarized. They were compared with the predictions of detailed kinetic models. The existence of a minimum in alpha in the slightly rich mixtures is demonstrated experimentally and confirmed computationally. (C) 2010 The Combustion Institute. Published by Elsevier Inc. All rights reserved.},
  author       = {Konnov, Alexander and Meuwissen, R. J. and de Goey, L. P. H.},
  issn         = {1540-7489},
  keyword      = {Ethanol,Burning velocity,Temperature dependence},
  language     = {eng},
  pages        = {1011--1019},
  publisher    = {Elsevier},
  series       = {Proceedings of the Combustion Institute},
  title        = {The temperature dependence of the laminar burning velocity of ethanol flames},
  url          = {http://dx.doi.org/10.1016/j.proci.2010.06.143},
  volume       = {33},
  year         = {2011},
}