Stabilization flames for highly diluted propane with nitrogen in coflow were investigated. Three distinct flame types were observed for various fuel mole fractions and jet velocities: nozzle attached flames, stationary lifted flames, and oscillating lifted flames. When fuel jet velocity was much smaller than coflow velocity, the base of a nozzle attached flame was observed to have a tribrachial structure. Jet velocity was scaled with stoichiometric laminar burning velocity, based on the balanced mechanism of the propagation speed of the tribrachial flame with flow velocity. Two distinct lifted flame stabilization modes were observed: stabilization in the developing region and in the developed region of jets depending on initial fuel mole fraction. Lifted flame could be stabilized for fuel velocity even smaller than stoichiometric laminar burning velocity due to the buoyancy effect. Oscillating lifted flames were observed within the frequency range 3-4.5 Hz by the repetitive action of buoyancy due to increased and decreased burning rates during falling and rising periods of flame oscillation. Original is an abstract.
|Original language||English (US)|
|Number of pages||1|
|Journal||International Symposium on Combustion Abstracts of Accepted Papers|
|State||Published - Jan 1 2000|
|Event||28th International Symposium on Combustion - Edinburgh, United Kingdom|
Duration: Jul 30 2000 → Aug 4 2000
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