A thickened-flame (TF) modeling approach is combined with a large eddy simulation (LES) methodology to model premixed combustion, and the accuracy of these model predictions is evaluated by comparing with the piloted premixed stoichiometric methane-air flame data of Chen et al. (1996, “The Detailed Flame Structure of Highly Stretched Turbulent Premixed Methane-Air Flames,” Combust. Flame, 107, pp. 233–244) at a Reynolds number . In the TF model, the flame front is artificially thickened to resolve it on the computational LES grid and the reaction rates are specified using reduced chemistry. The response of the thickened-flame to turbulence is taken care of by incorporating an efficiency function in the governing equations. The efficiency function depends on the characteristics of the local turbulence and on the characteristics of the premixed flame such as laminar flame speed and thickness. Three variants of the TF model are examined: the original thickened-flame model, the power-law flame-wrinkling model, and the dynamically modified TF model. Reasonable agreement is found when comparing predictions with the experimental data and with computations reported using a probability distribution function modeling approach. The results of the TF model are in better agreement with data when compared with the predictions of the -equation approach.
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November 2009
Research Papers
Large Eddy Simulation of Premixed Combustion With a Thickened-Flame Approach
Ashoke De,
Ashoke De
Department of Mechanical Engineering,
Louisiana State University
, Baton Rouge, LA 70803
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Sumanta Acharya
Sumanta Acharya
Professor
Department of Mechanical Engineering and Turbine Innovation and Energy Research Center,
e-mail: acharya@me.lsu.edu
Louisiana State University
, Baton Rouge, LA 70803
Search for other works by this author on:
Ashoke De
Department of Mechanical Engineering,
Louisiana State University
, Baton Rouge, LA 70803
Sumanta Acharya
Professor
Department of Mechanical Engineering and Turbine Innovation and Energy Research Center,
Louisiana State University
, Baton Rouge, LA 70803e-mail: acharya@me.lsu.edu
J. Eng. Gas Turbines Power. Nov 2009, 131(6): 061501 (11 pages)
Published Online: July 14, 2009
Article history
Received:
October 15, 2008
Revised:
October 17, 2008
Published:
July 14, 2009
Citation
De, A., and Acharya, S. (July 14, 2009). "Large Eddy Simulation of Premixed Combustion With a Thickened-Flame Approach." ASME. J. Eng. Gas Turbines Power. November 2009; 131(6): 061501. https://doi.org/10.1115/1.3094021
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