Study on ignition delay of DI diesel engine operating on diesel/dimethoxymethane blends

The study on ignition delay of DI diesel engine operating on diesel/dimethoxymethane oxygenated blends was conducted, and a predictive correlation for ignition delay of the oxygenated blends was proposed. The results showed that the modified correlation could reasonably predict the ignition delay of the diesel/dimethoxymethane blends. The results from calculation and experiment indicated that the value of cetane number of the oxygenated blends would decrease with the increase of oxygen mass fraction in the fuel blends, but the value was higher compared to that estimated from the mass fraction of fuel blends. The study indicated that the estimation of cetane number based on the fraction of each fuel was inappropriate for the determination of cetane number of blends.