The dashed lines in Fig. 7 represent the BSFC of 5% higher than the
original level in the upper side area of dashed line, the combination
of intake oxygen concentration and water emulsion ratio would
make the BSFC 5% higher than the original level, while the low BSFC
areawas in the lower side of dashed line. In Fig. 7, the effect ofwater
emulsification ratio on BSFC was considerably significant. BSFC
exceeded 5% range of the original when water emulsification ratio
was more than 15%, which was even worse when water emulsification
ratio increased up to 25%.3.4. The effect of water emulsion ratio and oxygen-enriched on
pressure and heat release
Fig. 8 shows the effects of different water emulsification ratios
on engine in-cylinder pressure and heat release rate with 21%
intake air oxygen concentration. It can be seen from the Figure that
under the condition of 100% load, the ignition timing has been
gradually delayed until ATDC with the increase of water emulsion
ratios. When engine fueled with pure diesel (0% water), under the