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A dynamic SGS model for LES of turbulent premixed flames
conference contribution
posted on 26.03.2010, 09:41 by Sreenivasa Rao Gubba, Salah IbrahimSalah Ibrahim, Weeratunge MalalasekeraWeeratunge MalalasekeraNumerical simulations are carried out for transient turbulent premixed flames using
large eddy simulations (LES) technique. The sub-grid scale (SGS) mean chemical reaction rate is
calculated using a simple algebraic relation for flame surface density (FSD), with a dynamic
formulation for the model coefficient. The dynamic model is derived based on fractal theory and a
flame wrinkling factor and implemented in compressible LES code. The developed model is used to
simulate turbulent premixed flames of stoichiometric propane/air mixture in a vented combustion
chamber, propagating over built-in solid obstacles. The fractal dimension is dynamically calculated
by viewing the flame front as a fractal surface, using the SGS velocity fluctuations and the strained
laminar burning velocity. The model predictions are validated against experimental measurements
where good agreements are obtained.
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- Mechanical, Electrical and Manufacturing Engineering