Engine performance and emission characteristics of a compression ignition engine fuelled with diesel/dimethoxy methane blends

摘要

The study on the performance and emissions of a compression ignition engine fuelled with diesel/dimethoxy methane (DMM) blends were conducted. The results showed that the engine thermal efficiency increases and the diesel equivalent brake specific fuel consumption (bsfc) decreases with the increase in oxygen mass fraction (or DMM mass fraction) of the diesel/DMM blends due to an increase fraction of premixed combustion phase, an oxygen enrichment and an improvement in diffusive combustion phase. Remarkable reduction in the exhaust CO and smoke can be achieved when operating on the diesel/DMM blend. A flat NOx/Smoke and thermal efficiency/smoke curves are presented when operating on the diesel/DMM fuel blends, or even a simultaneous reduction in both NOx and smoke can be realised at large DMM addition. Thermal efficiency and NOx give the highest value at 2% oxygen mass fraction (or 5% DMM volume fraction) for the combustion of diesel/DMM blends.