Staff

To observe the fundamental processes of flame wall interaction experimental setups with simple geometries and well defined boundary conditions are necessary. In our configuration, a V-flame is stabilized on a burner, where one branch interacts with a temperature-controlled stainless steel wall. This burner can be operate under turbulent and laminar flow conditions. The flame profile can be influenced by different air-fuel-ratios, Reynolds-numbers and turbulent intensities. The variation of different wall surfaces (e.g. catalytic surfaces), wall temperatures and different fuels has an additional effect on the flame propagation close to the wall.

The key to understand the physical processes in flame wall interaction is the simultaneous measurement of several quantities. Modern laser based diagnostics allow an accurate measurement of several physical variables with high temporal and spatial resolution without affecting the original flow field in any way.

For measuring the flow velocities Particle Image Velocimetry (PIV) is used in combination with Laser Induced Fluorescence (LIF) of the OH molecule. The OH data characterize the flame structure near the wall. Furthermore we are able to determine the flow and the wall temperatures by Coherent Anti-Stokes Raman Spectroscopy (CARS) Thermometry and Thermographic Phosphors, respectively. The instantaneous measurement of all these quantities can be used to fully characterize the physical processes in the flame and to validate numerical data of CFD simulations.