Study on the Effect of Pilot Diesel on the Combustion and Emission of Medium-Speed Dual Fuel Engine

SAGE combustion model coupled with detailed chemical reaction mechanism, and embedded with drop break-up, evaporation, collision, wall interaction submodels, was used in setting up a three di- mensional simulation model which involves the in-cylinder, inlet and outlet for the ACD320DF marine medium-speed dual fuel engine. In gas mode, simulations were conducted under various micro-pilot diesel injection parameters. It is shown that pilot diesel parameters including injection timing and quantity have great impact on combustion characteristics and emission behaviors. To achieve better combustion and emission performance, micro-pilot diesel injection strategy should be adjusted upon the variation of engine working conditions.