Measurement of Soot Concentration in Turbulent Diffusion Flames

Abstract

Soot, total hydrocarbon, oxygen and the temperature of turbulent diffusion flames together with partially premixed turbulent diffusion flames of C3H8 and C2H2, were measured under the normal temperature and pressure to study the soot formation process in a flame. To study the effect of fuel properties on the soot formation process, the soot concentration in CH4, C2H2, C2H4, and C2H6 flames was also measured. The soot concentration is 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 flame temperature in the soot formation zone in the flame. However, if the temperature was increased beyond 1 400 K, the maximum soot concentration decreased. The maximum soot concentration was also increased by increasing the C/H ratio of the fuel.