C2

Unsteady modelling and simulation of oxy-fuel combustion chambers

The objective of project C2 is the modeling and simulation of the complete Oxy-Fuel combustion system using unsteady methods. Different modeling aspects are to be covered. First, the large separation of time and length scales occurring in Oxy-Fuel systems, i.e. small geometric features like the burner are part of a large combustion chamber. The analyzed and developed methods need to accurately describe the physical phenomena on the one hand, but must be able to provide results after reasonable computation times on the other hand. The efficient modeling of these different scales will be dealt with by different approaches, like a LES/RANS coupling, a Scale-Adaptive Simulation (SAS) and a temporal filtering procedure.

Second, the development of a transported Filtered Density Function (FDF) method within the context of Oxy-Fuel combustion. The model will be based on transported stochastic fields and on the Flamelet Generated Manifolds (FGM) model for the underlying chemistry. This method is supposed to give a correct representation of the turbulence-chemistry interaction within the combustor.

Ultimately, the model developments of other projects will be integrated into the overall model in this project. These other models include e.g. biomass and coal kinetics, pyrolysis and particle-turbulence-chemistry-interaction.