TY - JOUR
T1 - Soot particle size measurements in ethylene diffusion flames at elevated pressures
AU - Steinmetz, Scott
AU - Fang, Tiegang
AU - Roberts, William L.
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: The research reported in this work was funded by the U.S. Army Research Office under grant W911NF-10-1-0118, and by the Clean Combustion Research Center at King Abdullah University of Science and Technology.
PY - 2016/5/7
Y1 - 2016/5/7
N2 - 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.
AB - 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.
UR - http://hdl.handle.net/10754/622251
UR - https://linkinghub.elsevier.com/retrieve/pii/S0010218016300657
UR - http://www.scopus.com/inward/record.url?scp=84964931690&partnerID=8YFLogxK
U2 - 10.1016/j.combustflame.2016.02.034
DO - 10.1016/j.combustflame.2016.02.034
M3 - Article
SN - 0010-2180
VL - 169
SP - 85
EP - 93
JO - Combustion and Flame
JF - Combustion and Flame
ER -