فهرست نشریات علمی دسترسی آزاد ایران

Bioethanol-gasoline blends are used to reduce fossil-fuel consumption in SI engines (SIE). In this experimental study the effect of different blends of gasoline- bioethanol on the performance and emissions of a carbureted, single-cylinder, and four-stroke SIE is investigated at low load. Tests were performed at various speeds and the constant equivalence ratio. The results showed that ηth,b decreased with the increase of ethanol percentage, and the latent heat of evaporation increased with the increase of ethanol blend percentage. Considering that the constant equivalence ratio, increasing the percentage of ethanol caused a decrease in the intake air mass and volumetric efficiency and simultaneously reducing the volume efficiency and increasing the latent heat caused a decrease of the air-fuel mixture temperature, misfiring, and resulted in the flame being extinguished. Tout and Tbody dropped up to 8.37% and 12.63%, respectively. The emission of NOX also decreased up to 93.73%. Of course, UHC will increase up to 160%. The emission of CO and CO2 increased by 92.5% and decreased by 23.98%, respectively. In conclusion, addition of ethanol to gasoline causes a decrease in ηth,b and a significant decrease in the emission of NOX and CO2 pollutants; however, it will increase UHC and CO emissions.