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Observations on Upstream Flame Propagation in the Ignition of Hydrocarbon Jets

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Abstract

A variety of investigators have attempted to characterize the mechanisms of how reaction zones stabilize, or propagate, against incoming reactants, particularly in stable lifted jet flames both laminar and turbulent. In this paper, experiments are described that investigate the characteristics of upstream flame propagation in turbulent hydrocarbon jet flames. An axisymmetric, gaseous turbulent jet mixing in air has been selectively ignited at downstream positions to assess the upstream propagation of the bulk reaction zone. The farthest axial position that permitted the reaction zone to propagate upstream after application of the ignition source, referred to as the “upper propagation limit”, or UPL, is determined for a variety of jet and air co-flow parameters. There is an inverse relationship between the upper propagation limit position and the jet Reynolds number. Conversely, there is a direct relationship between the upper propagation limit and the co-flow velocity. Interpretation of the results is related to the velocity at the stoichiometric surface. Global discussion is made as to what these results imply about the stabilization and propagation of turbulent lifted jet flames.

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Correspondence to K. M. Lyons.

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McCraw, J.L., Moore, N.J. & Lyons, K.M. Observations on Upstream Flame Propagation in the Ignition of Hydrocarbon Jets. Flow Turbulence Combust 79, 83–97 (2007). https://doi.org/10.1007/s10494-007-9071-9

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  • DOI: https://doi.org/10.1007/s10494-007-9071-9

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