The brake specific CO emissions (BSCO) are shown in Fig. 7a. As
seen in the figure, the BSCO emissions decrease with increase of
Fig. 4. Crank angle for 10%, 50% and 90% of heat release.
Fig. 5. Brake thermal efficiency and brake specific fuel consumption.
L. Zhu et al. / Fuel 90 (2011) 1743–1750 1747
engine load, due to the increase of in-cylinder gas temperature.
Compared with the diesel fuel, the BSCO emissions of biodiesel
are lower, because of the higher oxygen content of biodiesel, which
could improve the combustion process. As seen in Fig. 2,