Analysis on Emissions of Gasoline Engine with Different Ethanol Blends at Different Compression Ratio

Alcohol fuels do have some extra benefit compare to other alternative fuels, like the capability to work in existing engines also have the ability to decrease harmful emissions. Among the various alcohols, ethanol is considered most appropriate fuels for SI engines, because of its superior fuel quality and ecological benefits. In this experiment, ethanol was blended in different ratios as 0%, 5%, 10% and 20% with gasoline. The effect of the ethanol/gasoline blends on engine emissions at various compression ratios (CRs) of 10:1, 10.5:1, 11:1 and 11.5:1 was studied and examine by using computerized single cylinder, 4 stroke, multi-fuel, variable CRs engine. Engine emission characteristics are studied experimentally by the combustion of different blends of E0, E5, E10 and E20 at different loads of 0 kg, 1 kg, 2 kg and 3 kg. Result shows that adding ethanol in gasoline engine at CRs of 10:1, 10.5:1, 11:1, and 11.5:1 emission reduces (CO, CO2, NOx except HC). Additionally, CO2 emissions were found lower in E0 at CR 10.5:1 and also at CR 11.5:1 as compared to E5, E10 and E20. Also, it was observed that blended fuel permits varying CRs without any knock occurrence. Finally, octane numbers are found to be higher with ethanol blends. Keywords: - Ethanol, Octane Number, Combustion, Emissions, knock etc