1. The premixed combustion phasing decreased with the increase
of bioethanol in both conventional and narrow angle injectors.
At the same injection timing, the narrow angle injector showed
the increase of the premixed combustion duration with the
increase of bioethanol, while the conventional injector showed
almost uniform values regardless of bioethanol contents. The
advance of the injection timing in the narrow angle injector
induced the slight increase of the premixed combustion duration
and the advance of the premixed combustion phasing.
2. In the combustion using the narrow angle injector, the variation
in the peak combustion pressure is smaller than the combustion
using the conventional injector. In addition, it showed a higher
IMEP and shorter ignition delay characteristics.
3. When the narrow angle injector applied to the combustion with
diesel–bioethanol blends, the low and stable ISHC/ISCO emissions
can be achieved. In addition, by the early injection combustion
strategy, ISHC and ISCO emissions are significantly
reduced.
4. According to above investigation results, more stable combustion
and higher IMEP can be achieved through the use of the
narrow angle injector in diesel–bioethanol blends fueled combustion.
Especially, the combination of early injection strategy
and narrow angle injector induced the reduction of ISHC and
ISCO emissions, which is the weakness in diesel–bioethanol
blends fueled combustion.