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Journal of Combustion
Volume 2014, Article ID 710254, 18 pages
http://dx.doi.org/10.1155/2014/710254
Research Article

Large Eddy Simulation of a Bluff Body Stabilized Lean Premixed Flame

Department of Industrial Engineering, University of Florence, Via di Santa Marta 3, 50139 Florence, Italy

Received 28 June 2013; Revised 5 October 2013; Accepted 7 October 2013; Published 14 January 2014

Academic Editor: Eliseo Ranzi

Copyright © 2014 A. Andreini et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The present study is devoted to verify current capabilities of Large Eddy Simulation (LES) methodology in the modeling of lean premixed flames in the typical turbulent combustion regime of Dry Low gas turbine combustors. A relatively simple reactive test case, presenting all main aspects of turbulent combustion interaction and flame stabilization of gas turbine lean premixed combustors, was chosen as an affordable test to evaluate the feasibility of the technique also in more complex test cases. A comparison between LES and RANS modeling approach is performed in order to discuss modeling requirements, possible gains, and computational overloads associated with the former. Such comparison comprehends a sensitivity study to mesh refinement and combustion model characteristic constants, computational costs, and robustness of the approach. In order to expand the overview on different methods simulations were performed with both commercial and open-source codes switching from quasi-2D to fully 3D computations.