The effects of pilot injections in large two-strokemarine diesel engines have been studied in this work,using CFD and analysis of the combustion and emissions formation process with T-φ mapping. It has been demonstrated that, by adding a pilot injection,appropriately timed, fuel savings of the order of 1.7% can be achieved, without increasing NOX emissions.
Furthermore, analysis of the fuel-air mixture indicates that soot formation can possibly also be reduced. To illustrate the significance of the fuel economy, it is noted that a 1.7% economy corresponds to approximately 1.1 tones of fuel/day of engine operation, for an 8-cylinder engine
of this type. Such an engine can propel a tanker ship of 130,000 tones deadweight with 14 Knots