Large-eddy simulation of premixed turbulent combustion

The theory for large-eddy simulation of premixed turbulent combustion using a level-set method is being developed. A regime diagram for LES of premixed turbulent combustion is presented, which illustrates the influence of the LES filter width on the different combustion regimes. A new LES filter kernel for the derivation of the G-equation for the filtered flame front position is developed. The application of this filter in the derivation of the mean G-equation leads to a flame front conditioned filtered velocity. A model is developed relating this quantity to the unconditional mean velocity. The model is applied to turbulent premixed Bunsen flames with different jet exit Reynolds numbers, and hence different location in the combustion regimes. The results will shown in the regime diagram and compared with experimental data for velocity and turbulent kinetic energy.