Soot particle size measurements in ethylene diffusion flames at elevated pressures

by S.A. Steinmetz, T. Fang, W.L. Roberts
Year: 2016 ISSN: DOI: 10.1016/j.combustflame.2016.02.034

Bibliography

Soot particle size measurements in ethylene diffusion flames at elevated pressures
S.A. Steinmetz, T. Fang, W.L. Roberts
Combustion and Flame 169, 85-93, (2016)

Abstract

Pub_2016_SPS

Soot particle size is investigated in laminar nitrogen-diluted ethylene coflow diffusion flames at 4, 8, 12 and 16 atm. Line of sight attenuation and scattering are used to measure two-dimensional soot volume fraction and particle size fields for the first time at elevated pressures. Soot volume fraction dependence on pressure is consistent with the observations of similar studies, scaling approximately with the square of pressure. Scattering intensity is analyzed through Rayleigh and Rayleigh–Debye–Gans polydisperse fractal aggregate theories to provide two estimates of particle size. An increase in overall particle sizes with pressure is found, consistent with similar one-dimensional studies. Particle diameters in the annulus of the flame increase faster with pressure than those on centerline. Contrary to previous studies, the dependence of particle size on pressure was found to taper off between 8 and 12 atm, with little observed growth beyond 12 atm. The measurements provide additional data for one of the International Sooting Flame (ISF) workshop’s target pressurized flames.

Keywords

Soot High pressure Particle Aggregate Scattering