Influence of combusting methane-hydrogen mixtures on compression-ignition engine exhaust emissions and in-cylinder gas composition

The results showed lower exhaust CO2 and particulate emissions at all engine loads when combusting methane-hydrogen mixtures as compared to diesel fuel only. CO and unburned THC emissions were higher for methane-hydrogen mixtures at all engine loads when compared with diesel fuel only. NOx emissions increased with increasing proportion of hydrogen in the aspirated mixture at all engine loads. In-cylinder NOx levels were observed to be higher in the region between the fuel sprays as compared to within the spray core, attributable to higher temperatures reached in between the sprays post ignition.