In this work, different morphological parameters of soot are investigated using multi-angle light scattering and extinction, at elevated pressures. N2-diluted ethylene/air counterflow diffusion flames are stabilized inside the pressure vessel at pressures up to 5 atm. The pressure vessel can provide optical access for multi-angle light scattering from 10 to 170 degrees. An Ar/Kr ion laser beam emitted at 514.5 nm wavelength is focused at the center of the flame and light scattered by soot particles is measured, at several angles between 25° to 165°, by light collection optics that are mounted on a rotary stage. A global strain rate of 30s-1 is maintained for all pressures by adjusting the inlet flow. The scattering measurements are analyzed using Rayleigh-Debye-Gans theory for polydisperse fractal aggregates and scattering to absorption ratio, soot volume fraction, mean particle diameter and aggregate size distribution are calculated through the 1-D flame as a function of pressure.
|Original language||English (US)|
|Title of host publication||10th U.S. National Combustion Meeting|
|Publisher||Eastern States Section of the Combustion Institute|
|State||Published - Jan 1 2017|