Flame Propagation and Blowout in Hydrocarbon Jets: Experiments to Understand the Stability and Structure

This research supported by the U.S. Army Research Office examines a myriad of facets of lifted hydrocarbon jet flames in the presence of air co-flow. At a certain jet exit velocity, a flame will lift from the fuel nozzle and stabilize at some downstream position. The partially-premixed flame front of the lifted flame oscillates, with the oscillations becoming greater in flames stabilized further downstream. These oscillations are also observed in flames where blowout is imminent. Research progress has been made in a) flame blowout in diluted jets and confined co-flow systems, b) flame hysteresis in diluted and confined jets, c) reacting jets in air cross-flows to examine the nature of the stability characteristics and d) electrostatic flow control, that has potential for combustion control applications. The research has involved both undergraduate and graduate students, and has been published in the literature. (a) Papers published in peer-reviewed journals (N/A for none) Enter List of papers submitted or published that acknowledge ARO support from the start of the project to the date of this printing. List the papers, including journal references, in the following categories: Paper Received Wei Wang, Kevin M. Lyons. Leading-Edge Velocities and LiftedMethane Jet Flame Stability, Journal of Combustion, (01 2010): . doi: 2011/06/27 10:52:34 13 Nancy J. Moore, James Kribs, Kevin M. Lyons. Investigation of Jet-Flame Blowout with Lean-Limit Considerations, Flow, Turbulence and Combustion, (03 2011): . doi: 2011/06/27 10:43:36 12 NJ Moore and KM Lyons. Leading-Edge Flame Fluctuations in Lifted Turbulent Flames, Combustion Science and Technology, (07 2010): . doi: 2011/06/27 10:34:38 11 K. M. Lyons, N. J. Moore, J. L. McCraw, K. A. Watson, C. D. Carter, J. M. Donbar. On Flame-Edge Propagation, Flow, Turbulence and Combustion, (02 2008): . doi: 2011/06/27 10:28:23 10 Michael S. June*, James Kribs, Kevin M. Lyons. Efficiency of electrostatic air moving devices, Journal of Electrostatics, (06 2010): . doi: 2011/06/27 10:18:57 8 N. J. Moore, J. L. McCraw, and K. M. Lyons. Observations on Jet Flame Blowout, , (01 2010): . doi: 2010/01/07 11:17:02 4