The stabilization mechanism and structure of turbulent hydrocarbon lifted flames
- Citation:
- Joedicke, A. a, N. a Peters, and M. b Mansour, "The stabilization mechanism and structure of turbulent hydrocarbon lifted flames", Proceedings of the Combustion Institute, vol. 28, no. 1, pp. 901-909, 2000.
Abstract:
The structure and stabilization mechanism of turbulent lifted non-premixed hydrocarbon flames are examined using combined laser imaging techniques. The techniques include Rayleigh scattering, laser induced predissociation fluorescence of OH, LIF of PAH, LIF of CH2O, and planar imaging velocimetry. Two pure fuels are used: methane (CH4) and propane (C3H8), and three diluted fuels of CH4 with 15% nitrogen; C3H8 with 15% nitrogen, and ethylene (C2H4) with 50% nitrogen. Spectroscopic scanning has been conducted for a stoichiometric methane-air flame to ensure that the signal is free from other interferences occurred within the spectral range of the glass filter. The geometrical structure of multi-reaction zones and flow field at the stabilization region are simultaneously measured in 16 hydrocarbon flames. The data reveal the existence of triple flame structure at the stabilization region of turbulent lifted flames. Increasing the jet velocity leads to an increase of the lift-off height and to a broadening of the lift-off region. The flow field structure in the low velocity lifted flames is quite similar to that in laminar triple flames. At the stabilization region, the turbulent flame speed is equal to the local flow velocity perpendicular to the flame front.
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