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Large eddy simulation of fuel variability and flame dynamics of hydrogen-enriched nonpremixed flames

Large eddy simulation of fuel variability and flame dynamics of hydrogen-enriched nonpremixed flames
Large eddy simulation of fuel variability and flame dynamics of hydrogen-enriched nonpremixed flames
In this study large eddy simulation (LES) technique has been used to predict the fuel variability effects and flame dynamics of four hydrogen-enriched turbulent nonpremixed flames. The LES governing equations are solved on a structured non-uniform Cartesian grid with the finite volume method, where the Smagorinsky eddy viscosity model with the localised dynamic procedure is used to model the subgrid scale turbulence. The conserved scalar mixture fraction based thermo-chemical variables are described using the steady laminar flamelet model. The Favre filtered scalars are obtained from the presumed beta probability density function approach. Results are discussed for the instantaneous flame structure, time-averaged flame temperature and combustion product mass fractions. In the LES results, significant differences in flame temperature and species mass fractions have been observed, depending on the amount of hydrogen, nitrogen and carbon monoxide in the fuel mixture. Detailed comparison of LES results with experimental measurements showed that the predicted mean temperature and mass fraction of species agree well with the experimental data. The high diffusivity and reactivity of hydrogen largely affect the flame temperature and formation of combustion products in syngas flames. The study demonstrates that LES together with the laminar flamelet model is capable of predicting the fuel variability effects and flame dynamics of turbulent nonpremixed hydrogen-enriched combustion including syngas flames.
syngas combustion, fuel variability, flame dynamics, les, laminar flamelet model
0378-3820
2-13
Ranga Dinesh, K.K.J.
6454b22c-f505-40f9-8ad4-a1168e8f87cd
Jiang, X.
008a11fa-f330-4355-b5c6-2878d1ab0f5c
Malalasekera, W.
d3bc4153-1af3-41ab-9e42-4aa0d7cbaec7
Odedra, A.
f7907676-583c-4a5d-8222-06ac00d796a4
Ranga Dinesh, K.K.J.
6454b22c-f505-40f9-8ad4-a1168e8f87cd
Jiang, X.
008a11fa-f330-4355-b5c6-2878d1ab0f5c
Malalasekera, W.
d3bc4153-1af3-41ab-9e42-4aa0d7cbaec7
Odedra, A.
f7907676-583c-4a5d-8222-06ac00d796a4

Ranga Dinesh, K.K.J., Jiang, X., Malalasekera, W. and Odedra, A. (2013) Large eddy simulation of fuel variability and flame dynamics of hydrogen-enriched nonpremixed flames. [in special issue: Selected Papers from the Eleventh International Conference on Combustion and Energy Utilizatio (ICCEU)] Fuel Processing Technology, 107, 2-13. (doi:10.1016/j.fuproc.2012.07.019).

Record type: Article

Abstract

In this study large eddy simulation (LES) technique has been used to predict the fuel variability effects and flame dynamics of four hydrogen-enriched turbulent nonpremixed flames. The LES governing equations are solved on a structured non-uniform Cartesian grid with the finite volume method, where the Smagorinsky eddy viscosity model with the localised dynamic procedure is used to model the subgrid scale turbulence. The conserved scalar mixture fraction based thermo-chemical variables are described using the steady laminar flamelet model. The Favre filtered scalars are obtained from the presumed beta probability density function approach. Results are discussed for the instantaneous flame structure, time-averaged flame temperature and combustion product mass fractions. In the LES results, significant differences in flame temperature and species mass fractions have been observed, depending on the amount of hydrogen, nitrogen and carbon monoxide in the fuel mixture. Detailed comparison of LES results with experimental measurements showed that the predicted mean temperature and mass fraction of species agree well with the experimental data. The high diffusivity and reactivity of hydrogen largely affect the flame temperature and formation of combustion products in syngas flames. The study demonstrates that LES together with the laminar flamelet model is capable of predicting the fuel variability effects and flame dynamics of turbulent nonpremixed hydrogen-enriched combustion including syngas flames.

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Published date: March 2013
Keywords: syngas combustion, fuel variability, flame dynamics, les, laminar flamelet model
Organisations: Engineering Science Unit

Identifiers

Local EPrints ID: 354098
URI: http://eprints.soton.ac.uk/id/eprint/354098
ISSN: 0378-3820
PURE UUID: 35212ac0-6982-4614-89c6-1f2694d966d3
ORCID for K.K.J. Ranga Dinesh: ORCID iD orcid.org/0000-0001-9176-6834

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Date deposited: 01 Jul 2013 10:07
Last modified: 31 Jul 2019 00:34

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