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Turbulence-chemistry interaction in lean premixed hydrogen combustion

Turbulence-chemistry interaction in lean premixed hydrogen combustion
Turbulence-chemistry interaction in lean premixed hydrogen combustion
This paper presents three-dimensional direct numerical simulations of lean premixed hydrogen flames at an equivalence ratio of varphi=0.4 over a range of turbulence levels from Ka=1 - 36. The simulations form part of a larger effort to construct a DNS database that can be used by the community for model construction and validation. We have focussed on producing well-resolved simulations at conditions representative of atmospheric laboratory-scale flames. After an overview of phenomenological trends with increasing Karlovitz number, we examine the factors that lead to an observed decorrelation between fuel consumption and heat release in the flame at Ka=36. We show that in this flame the fuel consumption is greatly enhanced in regions of positive curvature. We also show that the radical pool is enriched throughout the entire flame as $\Ka$ is increased. In particular, we identify three reactions that, driven by high molar concentrations of radicals at low temperatures, are responsible for high levels of heat release away from regions of fuel consumption, thereby accounting for the observed decorrelation between fuel consumption and heat release.
1540-7489
1321-1329
Aspden, A.J.
7353e0e9-fbed-4f5a-a610-b045cd4cd576
Day, M.S.
bd698fe4-31ba-4de8-98ec-00a9ea500f69
Bell, J.B.
b244a2f4-2d90-4571-a247-b0b2e715e2d0
Aspden, A.J.
7353e0e9-fbed-4f5a-a610-b045cd4cd576
Day, M.S.
bd698fe4-31ba-4de8-98ec-00a9ea500f69
Bell, J.B.
b244a2f4-2d90-4571-a247-b0b2e715e2d0

Aspden, A.J., Day, M.S. and Bell, J.B. (2015) Turbulence-chemistry interaction in lean premixed hydrogen combustion. Proceedings of the Combustion Institute, 35 (2), 1321-1329. (doi:10.1016/j.proci.2014.08.012).

Record type: Article

Abstract

This paper presents three-dimensional direct numerical simulations of lean premixed hydrogen flames at an equivalence ratio of varphi=0.4 over a range of turbulence levels from Ka=1 - 36. The simulations form part of a larger effort to construct a DNS database that can be used by the community for model construction and validation. We have focussed on producing well-resolved simulations at conditions representative of atmospheric laboratory-scale flames. After an overview of phenomenological trends with increasing Karlovitz number, we examine the factors that lead to an observed decorrelation between fuel consumption and heat release in the flame at Ka=36. We show that in this flame the fuel consumption is greatly enhanced in regions of positive curvature. We also show that the radical pool is enriched throughout the entire flame as $\Ka$ is increased. In particular, we identify three reactions that, driven by high molar concentrations of radicals at low temperatures, are responsible for high levels of heat release away from regions of fuel consumption, thereby accounting for the observed decorrelation between fuel consumption and heat release.

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e-pub ahead of print date: 26 September 2014
Published date: 2015
Organisations: Applied Mathematics

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Local EPrints ID: 394229
URI: http://eprints.soton.ac.uk/id/eprint/394229
ISSN: 1540-7489
PURE UUID: 98110e0c-7781-42ce-8502-f1dde7df0862

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Date deposited: 13 May 2016 08:10
Last modified: 09 Dec 2019 19:38

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Contributors

Author: A.J. Aspden
Author: M.S. Day
Author: J.B. Bell

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