Dependence of Ignition Delay on Cetane Number under Various Super-charging and EGR Conditions in Diesel Combustion

Abstract

To understand the dependence of ignition delay on the cetane number under various super-charging and EGR conditions in diesel combustion, ignition delays were systematically measured in a 0.83 L single cylinder diesel engine. The investigations were conducted over a wide range of intake oxygen concentrations, intake gas temperatures, and intake pressures with various cetane numbers to develop an empirical formula for the ignition delay based on the Arrhenius equation. The final proposed equation can adequately predict ignition delays with three parameters: the cetane number as well as the in-cylinder gas temperature and the oxygen partial pressure at the start of the fuel injection.