Abstract
Detailed scalar and velocity measurements have been made in the near wake region of bluff body stabilized, lean, premixed ethylene/air flames at a cold flow Reynolds number of 3800. Two cases were studied at equivalence ratios, Φ =0.63 and Φ = 0.54 (close to the lean blow-off limit). Transverse velocity spectra and velocity fluctuation patterns characteristic of vortex shedding were observed behind the rectangular flame holder (3 mm by 6 mm). The recirculation zone for the leaner, less stable, flame is longer (65 mm) than the richer case (15 mm) contrary to common scaling assumptions. This is probably due to the energetic, low frequency (<70 Hz), irregular shedding found in the near wake of the leaner flame which may be an indicator of impending blow-off.
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© 1992 Springer-Verlag, New York, Inc.
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Shepherd, I.G., Hertzberg, J.R., Talbot, L. (1992). Flame Holding In Unconfined Turbulent Premixed Flames. In: Hussaini, M.Y., Kumar, A., Voigt, R.G. (eds) Major Research Topics in Combustion. ICASE/NASA LaRC Series. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-2884-4_14
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DOI: https://doi.org/10.1007/978-1-4612-2884-4_14
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