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Data consistency of the burning velocity measurements using the heat flux method : Hydrogen flames

Alekseev, Vladimir A. LU and Konnov, Alexander A. LU (2018) In Combustion and Flame 194. p.28-36
Abstract

Consistent datasets of experiments are highly important both for validation and optimization of kinetic mechanisms. An analysis of the data consistency of all available burning velocity measurements of hydrogen flames using the heat flux method at atmospheric pressure is performed in the present work. A comparison of many experiments performed in several laboratories with different types of dilution by various inerts was guided by kinetic modeling using two kinetic mechanisms. Konnov (2015) and ELTE (Varga et al., 2016) models demonstrated a uniform trend at all conditions tested: the second mechanism predicts lower burning velocities which are in better agreement with the heat flux measurements from different groups. Some experimental... (More)

Consistent datasets of experiments are highly important both for validation and optimization of kinetic mechanisms. An analysis of the data consistency of all available burning velocity measurements of hydrogen flames using the heat flux method at atmospheric pressure is performed in the present work. A comparison of many experiments performed in several laboratories with different types of dilution by various inerts was guided by kinetic modeling using two kinetic mechanisms. Konnov (2015) and ELTE (Varga et al., 2016) models demonstrated a uniform trend at all conditions tested: the second mechanism predicts lower burning velocities which are in better agreement with the heat flux measurements from different groups. Some experimental datasets, however, significantly disagree with one or both models; these conditions were revisited experimentally in the present work. The laminar burning velocities of H2 + O2 + N2 mixtures with 7.7% O2 in O2 + N2 oxidizer and of 85:15 (H2 + N2) and 25:75 (H2 + N2) fuel mixtures with 12.5:87.5 (O2 + He) oxidizer have been measured. It was concluded that the results of Hermanns et al. (2007) are somewhat higher than those of other studies at similar conditions and a possible reason of this disagreement was suggested. Analysis of the measurements performed by Goswami et al. (2015) on a high-pressure installation suggests an equipment malfunction that led to the erroneous values of the equivalence ratio for hydrogen and syngas flames. The ELTE mechanism developed using an optimization approach shows a very good performance in predicting laminar burning velocities of hydrogen flames measured using the heat flux method.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Burning velocity, Heat flux method, Hydrogen, Kinetic mechanism
in
Combustion and Flame
volume
194
pages
9 pages
publisher
Elsevier
external identifiers
  • scopus:85046171398
ISSN
0010-2180
DOI
10.1016/j.combustflame.2018.04.011
language
English
LU publication?
yes
id
17651ad0-0a88-46af-a6ba-3f7e0902b326
date added to LUP
2018-05-07 13:31:34
date last changed
2019-02-20 11:16:28
@article{17651ad0-0a88-46af-a6ba-3f7e0902b326,
  abstract     = {<p>Consistent datasets of experiments are highly important both for validation and optimization of kinetic mechanisms. An analysis of the data consistency of all available burning velocity measurements of hydrogen flames using the heat flux method at atmospheric pressure is performed in the present work. A comparison of many experiments performed in several laboratories with different types of dilution by various inerts was guided by kinetic modeling using two kinetic mechanisms. Konnov (2015) and ELTE (Varga et al., 2016) models demonstrated a uniform trend at all conditions tested: the second mechanism predicts lower burning velocities which are in better agreement with the heat flux measurements from different groups. Some experimental datasets, however, significantly disagree with one or both models; these conditions were revisited experimentally in the present work. The laminar burning velocities of H<sub>2</sub> + O<sub>2</sub> + N<sub>2</sub> mixtures with 7.7% O<sub>2</sub> in O<sub>2</sub> + N<sub>2</sub> oxidizer and of 85:15 (H<sub>2</sub> + N<sub>2</sub>) and 25:75 (H<sub>2</sub> + N<sub>2</sub>) fuel mixtures with 12.5:87.5 (O<sub>2</sub> + He) oxidizer have been measured. It was concluded that the results of Hermanns et al. (2007) are somewhat higher than those of other studies at similar conditions and a possible reason of this disagreement was suggested. Analysis of the measurements performed by Goswami et al. (2015) on a high-pressure installation suggests an equipment malfunction that led to the erroneous values of the equivalence ratio for hydrogen and syngas flames. The ELTE mechanism developed using an optimization approach shows a very good performance in predicting laminar burning velocities of hydrogen flames measured using the heat flux method.</p>},
  author       = {Alekseev, Vladimir A. and Konnov, Alexander A.},
  issn         = {0010-2180},
  keyword      = {Burning velocity,Heat flux method,Hydrogen,Kinetic mechanism},
  language     = {eng},
  month        = {08},
  pages        = {28--36},
  publisher    = {Elsevier},
  series       = {Combustion and Flame},
  title        = {Data consistency of the burning velocity measurements using the heat flux method : Hydrogen flames},
  url          = {http://dx.doi.org/10.1016/j.combustflame.2018.04.011},
  volume       = {194},
  year         = {2018},
}