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In 2002 the European Commission adopted a European Union strategy to reduce atmospheric emissions from seagoing ships. The strategy reports on the magnitude and impact of ship emissions in the EU, and sets out a number of actions to reduce the contribution ofshipping to health and climate change. One possible approach for the reduction of NOx and soot emissions ofmarine diesel engines is the use ofmultiple iojection strategies, similar to the ones used in automotive diesel engines. In this way, diescl combustion could be optimized with respect to pollutant emissions, without compromising fuel efficiency.Our interest i$ in investigating the potential for emissions reduction and overall optimization of combustion in 1arge two-stroke marine diesel engines, using numerical simulation.In this context, we study the effects of advanced iajection strategies by utilizing Computational Fluid Dynamics (CFD) tools. We use the KIVPL-3 code as the modeling platfbrm, with improved models for spray breakup, autoignition and combustion.Here, we report first results, corresponding to pilot iniections, which are visualized for the fuel iajection and combustion processes, and are also mapped on temperatureequivalenee ratio charts (T-rp maps). This analysis reveals important inforrnation on pollutant fbrmation mechanisms in large marine diesel engines, and suggests that fuel savings with simultaneous reduetion of soot emissions may be feasible. that favor emissions fbrrnation can be identified by using ILp analysis of the fuel-air mixture, first introduced by Kamimoto et al. [71, and subsequently also used for Low Temperature Combustion (IJI]C) studies [8]. TLrp maps are isocontours Copyright @ 20e8 by the Japan Society of Mechanical Engineers -181-NII-Electronic

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