Abstract
The presence of a turbulent premixed flame strongly influences the properties of the adjacent velocity boundary layer. This influence is studied here using a generic configuration where at atmospheric pressure turbulent premixed methane/air flames interact with a temperature stabilized wall. The experiment is optimized for well-defined boundary conditions and optical accessibility in the zone where the flame impinges at the wall. Laser based diagnostic methods are used to measure two components of the velocity field by particle image velocimetry simultaneously with the flame front position using laser induced fluorescence of the OH molecule. Two measurement planes are selected that are aligned perpendicularly to the surface of the wall. Based on this data, the flow field near the wall is analyzed by different methodologies using laboratory-fixed and flame-conditioned statistics, a quadrant splitting analysis of the Reynolds stresses and an evaluation of the production term of the turbulent kinetic energy. The results of chemically reactive cases are compared to their corresponding non-reactive flows for otherwise identical inflow conditions. In the zone of flame-wall interactions the boundary layer structure and its turbulence are dominated by the turbulent flame. Important features are that the flame compresses the boundary layer already upstream the location where the flame is finally quenched and that ejection and sweeps are no longer the dominant mechanisms as in non-reactive boundary layers. This experimental data may serve additionally as a database for model development for near wall reactive flows.
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Acknowledgments
We acknowledge the financial support of Deutsche Forschungsgemeinschaft through SFB/Transregio 150. Andreas Dreizler is very grateful for additional support through the Leibniz program.
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This study was funded by Deutsche Forschungsgemeinschaft (DFG) through SFB/Transregio 150. Andreas Dreizler is additionally supported through the DFG Leibniz program.
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Jainski, C., Rißmann, M., Jakirlic, S. et al. Quenching of Premixed Flames at Cold Walls: Effects on the Local Flow Field. Flow Turbulence Combust 100, 177–196 (2018). https://doi.org/10.1007/s10494-017-9836-8
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DOI: https://doi.org/10.1007/s10494-017-9836-8