The Effects of Ethanol–gasoline Blend on Performance and Exhaust Emission Characteristics of Spark Ignition Engines

The effects of unleaded gasoline and unleaded gasoline–ethanol blends on engine performance and pollutant emissions were investigated experimentally in a single cylinder, four-stroke spark-ignition engine with variable engine speeds (۲۶۰۰–۳۵۰۰ rpm). Four different blends on a volume basis were applied. These are E۰ (۰% ethanol + ۱۰۰% unleaded gasoline), E۳ (۳% ethanol + ۹۷% unleaded gasoline), E۷ (۷% ethanol + ۹۳% unleaded gasoline) and E۱۰ (۱۰% ethanol + ۹۰% unleaded gasoline). Results of the engine test indicated that using ethanol–gasoline blended fuels improve output torque, power, volumetric efficiency and fuel consumption of the engine it was also noted that fuel consumption depends on the engine speed rather than the ethanol content for ethanol less than ۱۰% blended ratio. CO and unburned hydrocarbons emissions decrease dramatically as a result of the leaning effect caused by the ethanol addition CO۲ emission increases because of the improved combustion.

کلیدواژه ها:

Ethanol ، Gasoline ، Blends ، Engine performance ، Pollutant emission