The effects of fuel properties and different injection strategies on the performance and emissions of a marine diesel engine were investigated by using computational fluid dynamics(CFD) simulations. The results show that no matter what kind of fuel is used

heavy or light diesel fuel

the sequential injection

pilot-injection and post-injection all have potential in reducing NOx emission and fuel consumption simultaneously. The lowest fuel consumption can be obtained using the sequential injection strategy with Seq4(the injection interval between two injectors being 4°). Lower fuel consumption and lower NOx emission can be easily realized by using the pilot-injection of large proportion and small proportion respectively with proper injection interval between the main-injection and pre-injection. Fuel consumption cannot be significantly reduced using the post-injection strategy

and fuel consumption rises with the increases in the injection interval between the main-injection and post injection

and in post-injection quantity.