Effect of Pilot Fuel Injection on Graphitic Crystallite Size and Oxidation Reactivity of Soot Particles from Diesel Engine

Abstract

Effect of pilot fuel injection on graphitic crystallite size and oxidation reactivity of soot particles from a small DI diesel engine was investigated experimentally. The soot particles were sampled from exhaust gas, and its graphitic crystallite size was investigated by laser Raman spectroscopy and high-resolution transmission electron microscopy (HRTEM). Oxidation reactivity of soot was evaluated by thermalgravimetric analyzer (TG). The graphitic crystallite size of soot increases with increasing the pilot fuel injection quantity. The results of TG analysis indicated that the oxidation reactivity of soot decreases with the increase of graphitic crystallite size.