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The present study introduces an injection technique for Premixed Charge Compression Ignition (PCCI) combustion in marine diesel engines. It aims to improve the controllability in the spray propagation and obtain the ideal mixture formation through the use of behavior of a merged spray which is formed by a mutual spray impingement between two sprays. Experiment was carried out to confirm the feasibility of controlling the spray propagation in a constant volume chamber. Further, the effects of merged spray propagation on mixture formation, ignition and combustion process have been investigated in a Rapid Compression Machine (RCM).

The present study introduces a multi-component model for heavy fuel oil combustion based on two component approximation, implemented into KIVA-3V using modified evaporation, ignition and combustion models. The fuel is treated as a blend of residual portion and cutter stocks. Different fuel properties are assigned to each component affecting evaporation behavior in the liquid phase as well as ignition and combustion characteristics in the vapor phase. The model was validated regarding spray and flame appearance using photographs of spray combustion in a visual constant volume combustion chamber. Further the effects of fuel component properties on the ignition and combustion properties of the fuel blend have been investigated based on rate of heat release analysis.