| Flame stretch and preferential diffusion are recognized to have a determining effect on the burning velocity in premixed flames. In applying Flamelet Generated Manifolds for reducing chemistry, care has to be taken to include preferential diffusion effects, and predict stretch effects accurately For all kinds of laminar cases the FGM method was tested and results agree well with detailed computations. Here methane was always the fuel. For other fuels in general the method will not be valid without taking care. In this new research we will focus on adding hydrogen to methane resulting in significant preferential diffusion effects. Burning rates will be enhanced for effective fuel Lewis numbers smaller then unity, due to a more instable flamefront. These effects can be captured by adding more control variables in the presently used FGM method. This will be studied, implemented and validated in the present study. Effects on LES modeling will be studied as additionally. |
