TED-AJ03-408 FLAME LENGTH AND EXIT PLANE MIXING IN RESONANTLY EXCITED JET DIFFUSION FLAMES :

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  • Bisetti,F.
    Department of Mechanical Engineering The University of Texas at Austin
  • Ezekoye,O. A.
    Department of Mechanical Engineering The University of Texas at Austin
  • Clemens,N. T.
    Department of Aerospace Engineering and Engineering Mechanics The University of Texas at Austin

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Intimate fuel-air mixing is central to pollution reduction and increased combustion efficiency in a wide range of combustion devices. Inherent safety concerns with premixed combustion systems limit the extent to which general combustion burners can be premixed. For this reason, the ability to efficiently premix fuel and oxidizer at a burner exit nozzle would hold enormous technological potential. The literature provides indications that acoustic forcing of flames aids in partial premixing. To see if resonant acoustic forcing could be useful for flame soot reduction, a burner was constructed with an exit nozzle that is capable of producing organ pipe resonance. The result of resonance conditions is that the gas in the tube exhibits very large amplitude, and high frequency modulation of its pressure and velocity field. Our results show that we can induce dramatic differences in the flame structure and luminosity when the flame is forced near the resonant frequency of the tube. We believe the mechanism for the observed dramatic reduction in soot has to do with a sort of partial premixing induced by the acoustic field and a resulting reverse flow mechanism, together with enhanced entrainment at the bottom of the flame, brought by vortical structures, and increased turbulence levels. Photographic evidence of the phenomenon, and flame length data are provided along with a scaling model based on linear acoustic theory, and simple one-dimensional considerations.

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