Optical constants of soot in hydrocarbon flames

A dispersion model for the optical constants of soot in hydrocarbon flames has been established on the basis of a more rigorous consideration of the electronic band structure and the dispersion constants. The dispersion constants of hydrocarbon soot have been determined from this model in conjunction with the in-situ flame transmission data in the visible and infrared ranges, thus truly reflecting soot in flames. It is shown that the soot optical properties are rather insensitive to temperature changes at elevated temperatures but the room temperature values representative of soot in smoke do exhibit appreciable deviation. The results also indicate these properties to be relatively independent of the fuel hydrogen/carbon ratio.

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