Abstract
The characteristics of flame appearance, temperature profile, and NO_x emission resulting from gaseous and liquid fuels furnace combustion are investigated through a series of experiments. Numerical simulations are also conducted, for several cases, to support the experimental data. Three fuels are examined; hydrogen, propane, and a liquid fuel Jet-A (C_<12>H_<23>). The combustion is generated in two 840-mm long furnaces with diameters of 95 mm and 182 mm, respectively. Combustion air is introduced into the furnace through two coaxial air nozzles, which generate air velocity differences ΔUa. The flame appearance, temperature profile, and emission index of NO_x (EINO_x) are found to depend strongly on the furnace diameter D. This result implies that the furnace volume can characterize gaseous and liquid fuels combustion. The temperature measurements reveal that larger values of D and ΔUa lead to lower temperatures at the flame and post-flame regions. It is also found that the EINO_x can be scaled with a parameter DU_f ΔUa well. The normalized EINO_x is inversely proportional to the parameter, being attributable to the effects of dilution and flame stretch.
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