Abstract
The relationship between flame luminosity and unburned hydrocarbon concentration was studied using an atmospheric, tubular burner. Spectroscopic studies were conducted for different fuels, including kerosene, nitrogen-doped kerosene, and shale oil. Independent exhaust gas analyses were performed on shale oil and nitrogen-doped kerosene. At a particular fuel equivalence ratio, measurements showed flame luminosity to be a function of unburned hydrocarbons. Unburned hydrocarbons were found to become significant prior to an equivalence ratio corresponding to the flame's change from blue to yellow. This critical condition is a function of fuel-air mixing and inlet air preheat temperature. Spectroscopic work revealed presence of strong carbon, hydrocarbon, amine, and cyanide band spectra for the nitrogen-containing fuels. Exhaust gas analyses for shale oil and a comparable nitrogen-doped kerosene were similar.
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