Three-dimensional direct numerical simulation of turbulent lean premixed methane combustion with detailed kinetics

Aspden, A. J.; Day, M. S.; Bell, J. B.

doi:10.1016/j.combustflame.2016.01.027

Title: Three-dimensional direct numerical simulation of turbulent lean premixed methane combustion with detailed kinetics

Journal Article · Thu Feb 18 00:00:00 EST 2016 · Combustion and Flame

DOI:https://doi.org/10.1016/j.combustflame.2016.01.027· OSTI ID:1379255

Aspden, A. J. ^[1]; Day, M. S. ^[2]; Bell, J. B. ^[2]

Univ. of Southampton (United Kingdom); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

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.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1379255

Alternate ID(s):: OSTI ID: 1343458

Journal Information:: Combustion and Flame, Vol. 166, Issue C; ISSN 0010-2180

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 69 works

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