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The effect of temperature on the adiabatic burning velocities of diluted hydrogen flames: A kinetic study using an updated mechanism

Alekseev, Vladimir LU ; Christensen, Moah LU and Konnov, Alexander LU (2015) In Combustion and Flame 162(5). p.1884-1898
Abstract
The effect of temperature on the adiabatic burning velocities of diluted hydrogen flames has been analyzed using an updated version of the Konnov detailed reaction mechanism for hydrogen. The contemporary choice of the reaction rate constants is provided with the emphasis on their uncertainties, and the analysis of the performance of the updated mechanism is presented and compared to the previous version for a wide range of validation cases: jet stirred and flow reactors; oxidation, decomposition and ignition in shock waves; ignition in rapid compression machines; laminar burning velocity and flame structure. An overall improvement of the mechanism performance was observed, particularly for the shock tube and flow reactor studies.... (More)
The effect of temperature on the adiabatic burning velocities of diluted hydrogen flames has been analyzed using an updated version of the Konnov detailed reaction mechanism for hydrogen. The contemporary choice of the reaction rate constants is provided with the emphasis on their uncertainties, and the analysis of the performance of the updated mechanism is presented and compared to the previous version for a wide range of validation cases: jet stirred and flow reactors; oxidation, decomposition and ignition in shock waves; ignition in rapid compression machines; laminar burning velocity and flame structure. An overall improvement of the mechanism performance was observed, particularly for the shock tube and flow reactor studies. Temperature dependence of the burning velocity, S-L, is commonly interpreted using the correlation S-L = S-L0 (T/T-0)(alpha). The updated mechanism was applied to study the behavior of the power exponent alpha for H-2 + O-2 + N-2 flames in a wide range of stoichiometry and dilution ratios. The simulations were compared to the available experimental results, either taken from the literature or evaluated in the present study from the existing burning velocity data. The equivalence ratio and N-2 content in the mixture were found to have significant influence on the temperature power exponent. The dependence of the temperature exponent on the fitting temperature range was observed and discussed. This effect was found to cause significant discrepancies in the burning velocities at high temperatures, if obtained with empirical correlation. (C) 2014 The Combustion Institute. Published by Elsevier Inc. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Hydrogen, Burning velocity, Temperature dependence, Kinetic mechanism, Ignition, Oxidation
in
Combustion and Flame
volume
162
issue
5
pages
1884 - 1898
publisher
Elsevier
external identifiers
  • wos:000358561500024
  • scopus:84928377544
ISSN
0010-2180
DOI
10.1016/j.combustflame.2014.12.009
language
English
LU publication?
yes
id
8b719d49-58d0-4571-bf44-2cc179cf83b8 (old id 7773515)
date added to LUP
2015-09-18 15:05:10
date last changed
2017-05-21 03:49:20
@article{8b719d49-58d0-4571-bf44-2cc179cf83b8,
  abstract     = {The effect of temperature on the adiabatic burning velocities of diluted hydrogen flames has been analyzed using an updated version of the Konnov detailed reaction mechanism for hydrogen. The contemporary choice of the reaction rate constants is provided with the emphasis on their uncertainties, and the analysis of the performance of the updated mechanism is presented and compared to the previous version for a wide range of validation cases: jet stirred and flow reactors; oxidation, decomposition and ignition in shock waves; ignition in rapid compression machines; laminar burning velocity and flame structure. An overall improvement of the mechanism performance was observed, particularly for the shock tube and flow reactor studies. Temperature dependence of the burning velocity, S-L, is commonly interpreted using the correlation S-L = S-L0 (T/T-0)(alpha). The updated mechanism was applied to study the behavior of the power exponent alpha for H-2 + O-2 + N-2 flames in a wide range of stoichiometry and dilution ratios. The simulations were compared to the available experimental results, either taken from the literature or evaluated in the present study from the existing burning velocity data. The equivalence ratio and N-2 content in the mixture were found to have significant influence on the temperature power exponent. The dependence of the temperature exponent on the fitting temperature range was observed and discussed. This effect was found to cause significant discrepancies in the burning velocities at high temperatures, if obtained with empirical correlation. (C) 2014 The Combustion Institute. Published by Elsevier Inc. All rights reserved.},
  author       = {Alekseev, Vladimir and Christensen, Moah and Konnov, Alexander},
  issn         = {0010-2180},
  keyword      = {Hydrogen,Burning velocity,Temperature dependence,Kinetic mechanism,Ignition,Oxidation},
  language     = {eng},
  number       = {5},
  pages        = {1884--1898},
  publisher    = {Elsevier},
  series       = {Combustion and Flame},
  title        = {The effect of temperature on the adiabatic burning velocities of diluted hydrogen flames: A kinetic study using an updated mechanism},
  url          = {http://dx.doi.org/10.1016/j.combustflame.2014.12.009},
  volume       = {162},
  year         = {2015},
}