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Numerical analysis of reaction-diffusion effects on species mixing rates in turbulent premixed methane-air combustion

Numerical analysis of reaction-diffusion effects on species mixing rates in turbulent premixed methane-air combustion
Numerical analysis of reaction-diffusion effects on species mixing rates in turbulent premixed methane-air combustion
The scalar mixing time scale, a key quantity in many turbulent combustion models, is investigated for reactive scalars in premixed combustion. Direct numerical simulations (DNS) of three-dimensional, turbulent Bunsen flames with reduced methane-air chemistry have been analyzed in the thin reaction zones regime. Previous conclusions from single step chemistry DNS studies are confirmed regarding the role of dilatation and turbulence-chemistry interactions on the progress variable dissipation rate. Compared to the progress variable, the mixing rates of intermediate species is found to be several times greater. The variation of species mixing rates are explained with reference to the structure of one-dimensional premixed laminar flames. According to this analysis, mixing rates are governed by the strong gradients which are imposed by flamelet structures at high Damk¨ohler numbers. This suggests a modeling approach to estimate the mixing rate of individual species which can be applied, for example, in transported probability density function simulations. Flame turbulence interactions which modify the flamelet based representation are analyzed.
0010-2180
506-515
Richardson, E.S.
a8357516-e871-40d8-8a53-de7847aa2d08
Sankaran, R.
7b937918-e417-409c-99e4-26c3a4ad154f
Grout, R.W.
80b4fc77-9aad-45e9-b160-99251d3338ac
Chen, J.H.
fd295f97-acff-4984-a655-ee18d3b2a734
Richardson, E.S.
a8357516-e871-40d8-8a53-de7847aa2d08
Sankaran, R.
7b937918-e417-409c-99e4-26c3a4ad154f
Grout, R.W.
80b4fc77-9aad-45e9-b160-99251d3338ac
Chen, J.H.
fd295f97-acff-4984-a655-ee18d3b2a734

Richardson, E.S., Sankaran, R., Grout, R.W. and Chen, J.H. (2010) Numerical analysis of reaction-diffusion effects on species mixing rates in turbulent premixed methane-air combustion. Combustion and Flame, 157 (3), 506-515. (doi:10.1016/j.combustflame.2009.11.007).

Record type: Article

Abstract

The scalar mixing time scale, a key quantity in many turbulent combustion models, is investigated for reactive scalars in premixed combustion. Direct numerical simulations (DNS) of three-dimensional, turbulent Bunsen flames with reduced methane-air chemistry have been analyzed in the thin reaction zones regime. Previous conclusions from single step chemistry DNS studies are confirmed regarding the role of dilatation and turbulence-chemistry interactions on the progress variable dissipation rate. Compared to the progress variable, the mixing rates of intermediate species is found to be several times greater. The variation of species mixing rates are explained with reference to the structure of one-dimensional premixed laminar flames. According to this analysis, mixing rates are governed by the strong gradients which are imposed by flamelet structures at high Damk¨ohler numbers. This suggests a modeling approach to estimate the mixing rate of individual species which can be applied, for example, in transported probability density function simulations. Flame turbulence interactions which modify the flamelet based representation are analyzed.

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Published date: March 2010
Additional Information: Funded by U.S. Department of Energy: Sandia National Laboratories (DE-AC04-94-AL85000)
Organisations: Faculty of Engineering and the Environment

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Local EPrints ID: 172577
URI: http://eprints.soton.ac.uk/id/eprint/172577
ISSN: 0010-2180
PURE UUID: 446d7312-17bf-467a-b85d-87a762afffd6
ORCID for E.S. Richardson: ORCID iD orcid.org/0000-0002-7631-0377

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Date deposited: 28 Jan 2011 09:06
Last modified: 14 Mar 2024 02:56

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Contributors

Author: E.S. Richardson ORCID iD
Author: R. Sankaran
Author: R.W. Grout
Author: J.H. Chen

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