Abstract
For diesel combustion, the ignitability of butanol and ethanol are too low and the viscosity of unesterified vegetable oil is too high, but blends of these two kinds of fuels have sufficient ignitability with low viscosity, as well as low soot formation characteristics due to the oxygen content. The solubility of butanol and vegetable oil is very high and a wide range of blends is possible, while the blending of butanol, ethanol, and vegetable oil is limited to certain ratio. The experimental results showed that smokeless, low NOx, and low engine noise with a blend of the same volumes of butanol and unesterified vegetable oil and a blend of 40%, 20% by volume of butanol-ethanol with vegetable oil were established with optimum pilot injection and high EGR in a DI diesel engine.