Abstract
Measurements of the structure of sooting two-dimensional laminar ethylene-air diffusion flames have been made in the pressure range from 1.0 to 2.5 atmospheres. The effect of elevated pressure on soot formation was investigated through the use of light-scattering techniques to determine the soot volume fraction, particle size, and particle number density. At a fixed vertical location in the flame, maximum and integrated soot volume fractions increased approximately as the pressure raised to a power of 1.7±0.3, and the soot yield (mass of soot/mass of fuel) increased approximately as the pressure to a power of 0.7±0.3 This pressure dependence is larger than can be accounted for by variation in the stoichiometric adiabatic flame temperature with pressure, and is in the opposite direction from what would be predicted on the basis of the measured decrease in peak temperature with pressure in this non-adiabatic flame. Both the size and the number density of soot particles increased with pressure.
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