Three-dimensional direct numerical simulation of turbulent lean premixed methane combustion with detailed kinetics
Abstract
The interaction of maintained homogeneous isotropic turbulence with lean premixed methane flames is investigated using direct numerical simulation with detailed chemistry. The conditions are chosen to be close to those found in atmospheric laboratory experiments. As the Karlovitz number is increased from 1 to 36, the preheat zone becomes thickened, while the reaction zone remains largely unaffected. A negative correlation of fuel consumption with mean flame surface curvature is observed. With increasing turbulence intensity, the chemical composition in the preheat zone tends towards that of an idealised unity Lewis number flame, which we argue is the onset of the transition to distributed burning, and the response of the various chemical species is shown to fall into broad classes. Smaller-scale simulations are used to isolate the specific role of species diffusion at high turbulent intensities. Diffusion of atomic hydrogen is shown to be related to the observed curvature correlations, but does not have significant consequential impact on the thickening of the preheat zone. It is also shown that susceptibility of the preheat zone to thickening by turbulence is related to the 'global' Lewis number (the Lewis number of the deficient reactant); higher global Lewis number flames tend to be more pronemore »
- Authors:
-
- Univ. of Southampton (United Kingdom); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)
- OSTI Identifier:
- 1379255
- Alternate Identifier(s):
- OSTI ID: 1343458
- Grant/Contract Number:
- AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Combustion and Flame
- Additional Journal Information:
- Journal Volume: 166; Journal Issue: C; Journal ID: ISSN 0010-2180
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
Aspden, A. J., Day, M. S., and Bell, J. B. Three-dimensional direct numerical simulation of turbulent lean premixed methane combustion with detailed kinetics. United States: N. p., 2016.
Web. doi:10.1016/j.combustflame.2016.01.027.
Aspden, A. J., Day, M. S., & Bell, J. B. Three-dimensional direct numerical simulation of turbulent lean premixed methane combustion with detailed kinetics. United States. https://doi.org/10.1016/j.combustflame.2016.01.027
Aspden, A. J., Day, M. S., and Bell, J. B. Thu .
"Three-dimensional direct numerical simulation of turbulent lean premixed methane combustion with detailed kinetics". United States. https://doi.org/10.1016/j.combustflame.2016.01.027. https://www.osti.gov/servlets/purl/1379255.
@article{osti_1379255,
title = {Three-dimensional direct numerical simulation of turbulent lean premixed methane combustion with detailed kinetics},
author = {Aspden, A. J. and Day, M. S. and Bell, J. B.},
abstractNote = {The interaction of maintained homogeneous isotropic turbulence with lean premixed methane flames is investigated using direct numerical simulation with detailed chemistry. The conditions are chosen to be close to those found in atmospheric laboratory experiments. As the Karlovitz number is increased from 1 to 36, the preheat zone becomes thickened, while the reaction zone remains largely unaffected. A negative correlation of fuel consumption with mean flame surface curvature is observed. With increasing turbulence intensity, the chemical composition in the preheat zone tends towards that of an idealised unity Lewis number flame, which we argue is the onset of the transition to distributed burning, and the response of the various chemical species is shown to fall into broad classes. Smaller-scale simulations are used to isolate the specific role of species diffusion at high turbulent intensities. Diffusion of atomic hydrogen is shown to be related to the observed curvature correlations, but does not have significant consequential impact on the thickening of the preheat zone. It is also shown that susceptibility of the preheat zone to thickening by turbulence is related to the 'global' Lewis number (the Lewis number of the deficient reactant); higher global Lewis number flames tend to be more prone to thickening.},
doi = {10.1016/j.combustflame.2016.01.027},
journal = {Combustion and Flame},
number = C,
volume = 166,
place = {United States},
year = {Thu Feb 18 00:00:00 EST 2016},
month = {Thu Feb 18 00:00:00 EST 2016}
}
Web of Science
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