Measurement of Soot Concentration in Turbulent Diffusion Flames

Abstract

Soot, total hydrocarbon, oxygen, and temperature in turbulent diffusion flames and partially premixed turbulent diffusion flames of C₃H₈ and C₂H₂ were measured to study the soot formation process in flames. Further, to study the effect of fuel properties on soot formation, the soot concentrations in CH₂, C₃H₆, C₃H₈, C₂H₄ and C₂H₂ flams were also measured. The soot concentration in a flame increased along the flame axis as long as the oxygen concentration was low and the total hydrocarbon was not consumed. If the total hydrocarbon was consumed or oxygen increased, the soot concentration decreased. The maximum soot concentration in a flame was increased by increasing the temperature in the soot formation zone in the flame. However if the temperature was increased beyond 1400K, the maximum soot concentration decreased. The maximum soot concentration was increased by increasing the C/H ratio of the fuel.