MAN Energy Solutions is developing a new two-stroke dual fuel natural gas-diesel marine engine based on new premixed combustion technology. The current project aims to study the methane slip which is one of the main challenges of the premixed technology. The pilot diesel fuel injection parameters will be optimized to obtain higher efficiency and lower emissions.
The majority of diesel engines in operation in the maritime sector are equipped with a single fuel nozzle for direct injection of diesel into the combustion chamber. However, in the premixed two-stroke dual fuel methane-diesel marine engine there is another nozzle for methane injection inside the cylinder. The injected methane then mixes with the air to produce a combustible mixture. In the present project, we are trying to numerically study the effect of mixing on combustion to obtain an efficient combustion with the lowest possible methane slip. In addition, the pilot diesel fuel injection parameters will be optimized to minimize the use of diesel pilot fuel and reduce the emission levels.
The outcomes of the project are expected to assist in optimizing the performance of two-stroke premixed marine engines, as well as reducing the occurrence of methane slip. Furthermore, the knowledge and insights gained from this project can potentially be extended to help Danish maritime industry for development of new marine engines with different green gaseous alternative fuels, e.g. ammonia which is a topic of interest.