Experimental Study of Oxygen Depletion Effects on Soot Morphology and Nanostructure in Coflow Diffusion Aviation Fuel (RP-3) Flames

Oxygen concentration is a significant factor affecting soot formation and oxidation. However, there are few studies that have focused on the morphology nanostructure characteristics of in aviation kerosene, oxygen-depleted combustion flames. In present paper, five coflow flames under initial oxygen volume concentrations 18.5%, 19%, 20%, 21%, 23.5% were studied. The pneumatic probe sampling method high-resolution transmission electron microscopy (HRTEM) analysis conducted to quantify parameters, laser extinction (LE) was applied determine fraction. Among cases different oxidizer (23.5% 18.5%), change fraction quantified, degree graphitization particles, i.e., maturity, compared. results show peak value increased by 0.73 ppm as from 21% 23.5%, decreased 1.25 18.5%. When primary particle diameter at same dimensionless height then increased, which attributed competition between changes residence time growth rate particles. quantitative suggested reduced inhibited process carbon lattices maturity oxidation resistance soot. 18.5% height, mean fringe length an average 0.18 nm, tortuosity spacing 0.053 0.035 nm.