An experimental study was conducted on a 4-cylinder

direct injection diesel engine at a constant engine speed under five loads to evaluate the effect of different ternary fuels on combustion and regulated emissions of the engine. Several alcohols

namely

methanol

ethanol

butanol and pentanol

were mixed separately with a blended fuel containing diesel and biodiesel to prepare four ternary fuels with same oxygen concentration

including methanol blend(DBM)

ethanol blend(DBE)

butanol blend(DBBu) and pentanol blend(DBP) . Results show that use of methanol blend allows to have the highest combustion pressure in alcohol blends

while butanol blend has the highest heat release rate. Moreover

pentanol blend has the best CO and HC emissions in comparison with diesel fuel

while the optimal NOx emissions result from the use of methanol blend. Ethanol blend has the most obvious effect on particle reduction

which can reduce particle concentration by 22.4% to 55.6% and particle size by 3.4% to 12.8% and minimizing the emissions of nucleation mode and accumulation mode particles

while pentanol blend maximizes the emissions of both particles(except for high loads).