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OH*-chemiluminescence during autoignition of hydrogen with air in a pressurised turbulent flow reactor

Schönborn, Alessandro LU ; Sayad, Parisa LU ; Konnov, Alexander LU and Klingmann, Jens LU (2014) In International Journal of Hydrogen Energy 39(23). p.12166-12181
Abstract
Autoignition of hydrogen in air was studied in a turbulent flow reactor using OH*-chemiluminescence. High-speed imaging was used to visualise the formation of auto-ignition kernels in the flow, and to analyse the conditions under which temporary stabilisation of the flame kernels occurred. The experiments were carried out at temperatures of 800-850 K, pressures of 0.8-1.2 MPa and an equivalence ratio of phi = 0.25. Measurements of the autoignition delays yielded values in the range of tau = 210-447 ms. The autoignition delay results indicated that, over the range of conditions studied, ignition delays reduced with decreasing pressure. This observation contradicted homogeneous gas-phase kinetic calculations, which predicted an increase in... (More)
Autoignition of hydrogen in air was studied in a turbulent flow reactor using OH*-chemiluminescence. High-speed imaging was used to visualise the formation of auto-ignition kernels in the flow, and to analyse the conditions under which temporary stabilisation of the flame kernels occurred. The experiments were carried out at temperatures of 800-850 K, pressures of 0.8-1.2 MPa and an equivalence ratio of phi = 0.25. Measurements of the autoignition delays yielded values in the range of tau = 210-447 ms. The autoignition delay results indicated that, over the range of conditions studied, ignition delays reduced with decreasing pressure. This observation contradicted homogeneous gas-phase kinetic calculations, which predicted an increase in autoignition delay with decreasing pressure. If the kinetic model was altered to include surface reactions at the reactor walls, the calculations could be qualitatively reconciled with the experimental data, suggesting that wall reactions had a significant influence on autoignition delays. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Autoignition, Hydrogen, OH-chemiluminescence, Surface reactions, Kinetic, modelling, Flow reactor
in
International Journal of Hydrogen Energy
volume
39
issue
23
pages
12166 - 12181
publisher
Elsevier
external identifiers
  • wos:000340328800035
  • scopus:84904742584
ISSN
1879-3487
DOI
10.1016/j.ijhydene.2014.05.157
language
English
LU publication?
yes
id
21ad82eb-dad7-403e-b064-fda97400b072 (old id 4659226)
date added to LUP
2014-09-24 14:39:14
date last changed
2017-06-04 04:02:44
@article{21ad82eb-dad7-403e-b064-fda97400b072,
  abstract     = {Autoignition of hydrogen in air was studied in a turbulent flow reactor using OH*-chemiluminescence. High-speed imaging was used to visualise the formation of auto-ignition kernels in the flow, and to analyse the conditions under which temporary stabilisation of the flame kernels occurred. The experiments were carried out at temperatures of 800-850 K, pressures of 0.8-1.2 MPa and an equivalence ratio of phi = 0.25. Measurements of the autoignition delays yielded values in the range of tau = 210-447 ms. The autoignition delay results indicated that, over the range of conditions studied, ignition delays reduced with decreasing pressure. This observation contradicted homogeneous gas-phase kinetic calculations, which predicted an increase in autoignition delay with decreasing pressure. If the kinetic model was altered to include surface reactions at the reactor walls, the calculations could be qualitatively reconciled with the experimental data, suggesting that wall reactions had a significant influence on autoignition delays. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.},
  author       = {Schönborn, Alessandro and Sayad, Parisa and Konnov, Alexander and Klingmann, Jens},
  issn         = {1879-3487},
  keyword      = {Autoignition,Hydrogen,OH-chemiluminescence,Surface reactions,Kinetic,modelling,Flow reactor},
  language     = {eng},
  number       = {23},
  pages        = {12166--12181},
  publisher    = {Elsevier},
  series       = {International Journal of Hydrogen Energy},
  title        = {OH*-chemiluminescence during autoignition of hydrogen with air in a pressurised turbulent flow reactor},
  url          = {http://dx.doi.org/10.1016/j.ijhydene.2014.05.157},
  volume       = {39},
  year         = {2014},
}