Distribution of Soot Concentrations in the Diffusion Flames

概要

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The objective of the present work is to obtain information on the formation and the decomposition of the soot corresponding to the combustion condition. The quantity of combustion air and dilution of the fuel with N_2 gas are changed in a wide range and the quantity of fuel is constant in the experiment. The main results are as follows. The profile of soot concentration can be divided into two distinct zones, in the first of which the soot is formed and in the second of which soot combustion occurs. The soot formation occurs very easily with rich fuel and in the presence of some unburned hydrocarbons such as CH_4,C_2H_4 C_2H_6 and C_2H_2,there is no remarkable difference in both flames (Φ=0.6,1.4). However, combustion of soot is remarkably different because of entrainment of air. With regard to effect of dilution with N_2 gas, the soot formation rate is greatly suppressed in the formation zone, as the dilution ratio with N_2 gas increases.
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