PREMIXED COMBUSTION OF LIQUID FUEL BY AIR BUBBLE BLOWING

Premixed combustion of liquid fuel (kerosene) by air bubble blowing wa s attempted, which is a new method originated from the reverse concept of spray combustion. Setting a porous ceramic plate above the foam la yer formed by blowing air into fuel made it possible to stabilized pre mixed flames on the plate. For most conditions examined the surface of this flame-holding plate was heated and became red-hot, which was eff ective for promoting fuel evaporation. The dependencies on air flow ra te and equivalence ratio of temperature distributions inside and outsi de the plate were measured and examined in comparison with the cases f or uniform gas mixtures. The burned gas was also analyzed in the downs tream region and it was found that CO/CO2 level and UHC concentration were less than the regulation values over a wide range of combustion i ntensities up to the turn-down ratio of 4.8, and NOx concentration was nearly on the same level as other combustors for domestic use.