Modelling and parametric investigation of a large marine two-stroke dual fuel engine

This work deals with the modelling of a large marine two-stroke dual duel engine of the low gas pressure concept by using the GT-Power^TM software. Appropriate models were used to represent the engine processes including combustion, scavenging, heat transfer and friction whereas a knocking model was employed to characterise the engine unstable operation. The model was first validated against the manufacturer data and subsequently, the entire engine envelope in both operating modes was simulated. The derived results were used for analysing and discussing the engine performance and emissions as well as for comparing the two operating modes in terms of the turbocharger matching. In addition, parametric runs were performed and the results were used for identifying the settings that can further optimize the engine operation in the dual fuel mode in terms of CO₂ and NOx emissions trade-off.