Abstract
A laboratory burner has been developed for turbulent combustion of nonpremixed gaseous hydrocarbon fuels, with emphasis on producing very high mixing rates well away from the burner nozzle which is placed in a coflowing stream of air. This design has been chosen so that the effects of fast mixing on flame chemistry and extinction can be studied without the influence of flame lift-off or extinction at the nozzle. A concentric premixed pilot flame is used, with C2H2H2 fuel mixed in a ratio to make the basic pilot product composition equal to that of the main fuel, so that the flow can be modeled by parabolic partial differential equations as a two-stream mixing problem.Shadowgraph photography reveals rapidly developing turbulence close to the nozzle in which the pilot stream is quickly mixed out. Thermocouple measurements show that a low temperature region exists some 20 fuel jet diameters from the exit plane where extinction eventually occurs as flow rates are increased until mixing rates become excessive. Measurements of electrical conductivity in the flame indicate that it propagates intermittently before becoming extinguished.
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