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Numerical simulation of oxy-fuel jet flames using unstructured LES-CMC

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journal contribution
posted on 21.04.2015, 13:14 by Andrew GarmoryAndrew Garmory, E. Mastorakos
A finite volume Conditional Moment Closure (CMC) formulation has been developed as an LES sub-grid combustion model. This allows unstructured meshes to be used for both LES and CMC grids making the method more applicable to complex geometry. The method has been applied to an oxy-fuel jet flame. This flame offers new challenges to combustion modelling due to a high CO2 content in the oxidiser stream and significant H2 content in the fuel stream. The density ratio of the two streams is of the order 5 and the viscosity of the two streams will also differ. All the flames simulated showed localised extinction in the region around 3-5 jet diameters downstream of the nozzle, which is in very good agreement with the experiment. Trends for conditional and unconditional statistics with changing levels of H2 in the fuel are correctly captured by the LES-CMC method, although different levels of agreement are observed for different species and temperature and possible reasons for this are discussed. The degree of extinction is also correctly predicted to increase as the H2 content of the jet is reduced, showing the ability of the CMC method to predict complex turbulence-chemistry interaction phenomenon in the presence of changing fuel composition.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Published in

PROCEEDINGS OF THE COMBUSTION INSTITUTE

Volume

35

Issue

2

Pages

1207 - 1214 (8)

Citation

GARMORY, A. and MASTORAKOS, E., 2014. Numerical simulation of oxy-fuel jet flames using unstructured LES-CMC. Proceedings of the Combustion Institute, 35 (2) pp. 1207 - 1214.

Publisher

© Elsevier

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2014-06-07

Notes

NOTICE: this is the author’s version of a work that was accepted for publication in Proceedings of the Combustion Institute. 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 in Proceedings of the Combustion Institute, VOL 35, ISSUE 2, (2015). DOI: 10.1016/j.proci.2014.05.032.

ISSN

1540-7489

Language

en