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A comparison between direct numerical simulation and experiment of the turbulent burning velocity-related statistics in a turbulent methane-air premixed jet flame at high Karlovitz number

Wang, Haiou; Hawkes, Evatt R.; Zhou, Bo LU ; Chen, Jacqueline H.; Li, Zhongshan LU and Aldén, Marcus LU (2017) In Proceedings of the Combustion Institute2000-01-01+01:00 36(2). p.2045-2053
Abstract

A three-dimensional (3D) direct numerical simulation (DNS) of an experimental turbulent premixed jet flame at high Karlovitz number was studied. The DNS resolution adequately resolves both the flame and turbulence structures. A reduced chemical mechanism for premixed CH4/air flames with NOx based on GRI-Mech3.0 was used, including 268 elementary reactions, and 28 transported species. Consistent post-processing methods were applied to both the DNS and experimental data to evaluate turbulent burning velocity-related statistics, namely the flame surface density (FSD), and the flame curvature. Good agreement was achieved for the 2D comparisons. The DNS data were further analysed and provide 3D statistics unattainable... (More)

A three-dimensional (3D) direct numerical simulation (DNS) of an experimental turbulent premixed jet flame at high Karlovitz number was studied. The DNS resolution adequately resolves both the flame and turbulence structures. A reduced chemical mechanism for premixed CH4/air flames with NOx based on GRI-Mech3.0 was used, including 268 elementary reactions, and 28 transported species. Consistent post-processing methods were applied to both the DNS and experimental data to evaluate turbulent burning velocity-related statistics, namely the flame surface density (FSD), and the flame curvature. Good agreement was achieved for the 2D comparisons. The DNS data were further analysed and provide 3D statistics unattainable from the experiment. The ratio of the 3D and 2D flame surface densities was estimated. The results are comparable with other values reported for various experimental flames. The 3D and 2D flame curvatures were also compared and their distributions are shown to be quite different owing to the round on-average geometry. Instantaneous images of the heat release surrogate, [CH2O][OH], between the DNS and experiment agreed qualitatively. Various other experimentally obtainable surrogates for heat release rate including [CH2O][H], [CH2O][O], [HCO], and [CH] are also evaluated and compared using the DNS. The inner structure of the flame was compared between the DNS and experiment in terms of the joint PDFs of OH concentration and temperature. Generally good agreement was obtained; discrepancies may be due to the inconsistency of assumed equilibrium levels of OH concentration in the co-flow.

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organization
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type
Contribution to journal
publication status
published
subject
keywords
Direct numerical simulation, High Karlovitz number, Lean premixed combustion, Turbulent burning velocity
in
Proceedings of the Combustion Institute2000-01-01+01:00
volume
36
issue
2
pages
2045 - 2053
publisher
Elsevier
external identifiers
  • scopus:84994399667
  • wos:000397458900047
ISSN
1540-7489
DOI
10.1016/j.proci.2016.07.104
language
English
LU publication?
yes
id
5337ab15-fc4b-4563-8987-79983a689bfb
date added to LUP
2017-02-17 12:49:22
date last changed
2018-10-07 04:53:08
@article{5337ab15-fc4b-4563-8987-79983a689bfb,
  abstract     = {<p>A three-dimensional (3D) direct numerical simulation (DNS) of an experimental turbulent premixed jet flame at high Karlovitz number was studied. The DNS resolution adequately resolves both the flame and turbulence structures. A reduced chemical mechanism for premixed CH<sub>4</sub>/air flames with NO<sub>x</sub> based on GRI-Mech3.0 was used, including 268 elementary reactions, and 28 transported species. Consistent post-processing methods were applied to both the DNS and experimental data to evaluate turbulent burning velocity-related statistics, namely the flame surface density (FSD), and the flame curvature. Good agreement was achieved for the 2D comparisons. The DNS data were further analysed and provide 3D statistics unattainable from the experiment. The ratio of the 3D and 2D flame surface densities was estimated. The results are comparable with other values reported for various experimental flames. The 3D and 2D flame curvatures were also compared and their distributions are shown to be quite different owing to the round on-average geometry. Instantaneous images of the heat release surrogate, [CH<sub>2</sub>O][OH], between the DNS and experiment agreed qualitatively. Various other experimentally obtainable surrogates for heat release rate including [CH<sub>2</sub>O][H], [CH<sub>2</sub>O][O], [HCO], and [CH] are also evaluated and compared using the DNS. The inner structure of the flame was compared between the DNS and experiment in terms of the joint PDFs of OH concentration and temperature. Generally good agreement was obtained; discrepancies may be due to the inconsistency of assumed equilibrium levels of OH concentration in the co-flow.</p>},
  author       = {Wang, Haiou and Hawkes, Evatt R. and Zhou, Bo and Chen, Jacqueline H. and Li, Zhongshan and Aldén, Marcus},
  issn         = {1540-7489},
  keyword      = {Direct numerical simulation,High Karlovitz number,Lean premixed combustion,Turbulent burning velocity},
  language     = {eng},
  number       = {2},
  pages        = {2045--2053},
  publisher    = {Elsevier},
  series       = {Proceedings of the Combustion Institute2000-01-01+01:00},
  title        = {A comparison between direct numerical simulation and experiment of the turbulent burning velocity-related statistics in a turbulent methane-air premixed jet flame at high Karlovitz number},
  url          = {http://dx.doi.org/10.1016/j.proci.2016.07.104},
  volume       = {36},
  year         = {2017},
}