Detailed experimental investigation and characterization of oxy-coal-burners via laser-optical methods
The improvement of oxy-coal combustion requires a detailed understanding of the involved fluid mechanics, chemical kinetics, particle dynamics and their mutual interactions. Existing experimental investigations lack the required detail for validation of numerical simulations and for a more detailed understanding of the process. Typically measured single point values are insufficient to validate Large Eddy Simulations (LES), therefore experimental data of gradients and of the dynamics of the processes are required. The goal of the sub-project B4 is to investigate the flow field, the particle dynamics, the combustion process and their mutual interactions in an oxy-coal burner in detail.
For this purpose laser-optical methods such as particle image velocimetry (PIV), phase doppler anemometry, laser induced fluorescence (LIF) and coherent anti-Stokes Raman spectroscopy (CARS) are applied and adapted to the oxy-coal combustion process. For a good comparability the used burner is the same as the burner used in the sub-project C1. The burning chamber has a similar geometry to the one used in C1, but provides a much improved optical access. The investigations are evolving from single-phase non-reacting to two-phase reacting studies. For the two-phase reacting experiments at first a gas flame with inert particles is investigated before adding an increasing amount of coal particles to the flame.