Parametric investigation of a large two-stroke marine high-pressure direct injection engine by using computational fluid dynamics method

Abstract

This study aims at the parametric investigation of the gas injection system settings of a large marine two-stroke dual fuel engine by using a developed and customized CFD method in the ANSYS Fluent software. The investigated engine injection system parameters include the gas injection timing, the gas injection duration, the gas injector lateral angle, and the gas injector holes number. Based on the comparison of the predicted performance parameters for the closed-cycle processes, the results indicate that the gas injector lateral angle is the most significant parameter that affects the engine power as well as the NO and CO₂ emissions. For satisfying the contradictory objectives of retaining the engine power and reducing the NO and CO₂ emissions, appropriate design settings for the gas injection are recommended for the investigated engine operation in the gas mode at 75% load.