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Flow-flame interaction in turbulent boundary layer flashback of swirl flames

Dominik Ebi
Department of Aerospace Engineering and Engineering Mechanics The University of Texas at Austin 210 East 24th Street, Austin, TX 78712

Noel T. Clemens
Department of Aerospace Engineering and Engineering Mechanics, The University of Texas at Austin, 210 East 24th Street, Austin, TX 78712

Résumé

Boundary layer flashback of lean-premixed swirling flames is investigated by focusing on the upstream flame propagation inside the mixing tube of a model combustor. High-speed stereoscopic and tomographic PIV synchronized with chemiluminescence imaging is applied to study the flow-flame interaction. The region of negative axial velocity upstream of the leading flame tip observed in previous studies is found to not correspond to reverse flow or flow separation. Instead, streamlines are merely deflected by the blockage induced by the flame. The velocity field in the burnt gas is analyzed in order to shed light on the mechanisms that govern the flow-flame interaction.