In this paper, the supercritical (SC) fuel combustion is investigated on its performance in a diesel engine cylinder to improve output power and reduce emissions. The computational fluid dynamics (CFD) model is developed to comparatively study the spray combustion and the SC fuel combustion in a cylinder during constant volume combustion period. Results indicate that the engine in-cylinder pressure and output power can be increased by 6.8% and no less than 2.5% respectively. Moreover, the fuel concentration and temperature field of the SC combustion are more evenly distributed, which enables more sufficient combustion and indicates the potential to reduce pollutants such as NOx and soot.
Keywords clean combustion, supercritical fuel, compression ignition engine, computational fluid dynamics