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This work capitalizes on the investigation of the effect of split injection on the combustion and in-cylinder soot formation performance of low Compression Ratio GTL-fueled DI diesel engine. An optically-accessed Rapid Compression Machine was deployed allowing the application of optical diagnostics. A shadowgraph imaging was used to analyze spray development and detect ignition zones while imaging of soot incandescence was used to determine the temporal and spatial development of soot. In addition the rate of heat release was calculated for the analysis of the combustion characteristics. It has been found that split injection shortens sprays length while increases their penetration velocity. It alters the combustion from fully premixed to two-mode, premixed and non-premixed. Soot with split injection was, therefore, significantly larger while combustion noise was reduced by factor of 4.

This work capitalizes on the investigation of the effect of injection pressure and timing on the in-cylinder soot formation performance of low CR GTL-fueled DI diesel engine. An optically-accessed Rapid Compression Machine capable of simulating compression and expansion strokes of diesel engine was deployed allowing the application of optical diagnostics. For the detection of flame zones aiming mainly at determining the Lift-Off-Length, imaging of flame self-luminescence technique was used, while for the assessment of in-cylinder soot formation the photodiode-based non-imaging soot incandescence acquisition optical technique has been applied. Through in-cylinder installed pressure transducer and piston position sensor, the rate of heat release was calculated for the analysis of the combustion development. It was found that soot formation rate and peak decrease with increasing injection pressure. The former decreases, however, non-linearly, while the later decreases linearly.