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Title: Large eddy simulation of fuel variability and flame dynamics of hydrogen-enriched nonpremixed flames
Authors: Ranga-Dinesh, K.K.J.
Jiang, X.
Malalasekera, W.
Odedra, Anand
Keywords: Syngas combustion
Fuel variability
Flame dynamics
Laminar flamelet model
Issue Date: 2012
Publisher: © Elsevier
Citation: RANGA DINESH, K.K.J. ... et al, 2012. Large eddy simulation of fuel variability and flame dynamics of hydrogen-enriched nonpremixed flames. Fuel Processing Technology, 107, pp.2–13.
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 2 2 H , N and CO 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. Higher diffusivity and reactivity of 2 H 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.
Description: This is the author’s version of a work that was accepted for publication in Fuel Processing Technology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published at: http://dx.doi.org/10.1016/j.fuproc.2012.07.019
Version: Accepted for publication
DOI: 10.1016/j.fuproc.2012.07.019
URI: https://dspace.lboro.ac.uk/2134/10690
Publisher Link: http://dx.doi.org/10.1016/j.fuproc.2012.07.019
ISSN: 0378-3820
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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