Abstract
Measurements of the flame luminescence, velocity and temperature were conducted in four flames with different natural-gas/hydrogen fuel mixtures (at similar jet Reynolds numbers) in a jet-in-hot-coflow burner that mimics conditions found in real flameless combustion burners. The results show major changes in the flame stabilization mechanism when the hydrogen content of the fuel is increased. By gradually increasing the hydrogen concentration in the fuel, the typical autoignition kernels observed in natural-gas flames are detected at more upstream positions. At sufficient high hydrogen concentrations, the autoignition kernels are not detectable and the flame zone becomes a single continuous region. Temperatures higher than adiabatic are observed at the stabilization region in the hydrogen containing flames suggesting that preferential diffusion plays an important role in the stabilization mechanism of hydrogen enriched hydrocarbon fuels.
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