ABSTRACT
The present work describes a theoretical investigation concerning the performance of a
four strokes compression engine, which is powered by alternative fuels in the form of
diesel-ethanol and diesel –ether mixtures, the properties of which were sited from
literature. The amount of each alcohol added was 5, 10 and 15 % by volume. The
engine speed during the experimental work was within the range from 1000 to 4000
rpm, with engine was set at full throttle opening and hence the engine was operating
under full load conditions. Several parameters were calculated namely; engine torque,
brake mean effective pressure, brake power, specific fuel consumption and the thermal
efficiency, this was carried out using DIESEL-RK Software.
It was found that the engine is of highest thermal efficiency when it is powered by a 15
% ethanol-diesel blend, wile it is of minimum thermal efficiency when it is powered by
pure diesel fuel.. Further, it was found that both the thermal efficiency of the engine
and the specific fuel consumption increases with the percentage of either ethanol or
ether in the fuel blend . However, the power was found to decrease with the amount of
either ethanol or ether in the fuel blends.