doiSerbia

Exhaust emissions of methanol and ethanol-unleaded gasoline blends in a spark-ignition engine

Altun Şehmus (Department of Mechanical Education, Batman University, Batman, Turkey)
Öztop Hakan F. (Dept. Mechanical Engineering Technology Faculty, Fırat University, Elazığ, Turkey)
Öner Cengiz (Dept. Automotive Engineering Technology Faculty, Fırat University, Elazığ, Turkey)
Varol Yasin (Dept. Automotive Engineering Technology Faculty, Fırat University, Elazığ, Turkey)

In this study, the effect of unleaded gasoline and unleaded gasoline blended with 5% and 10% of ethanol or methanol on the performance and exhaust emissions of a spark-ignition engine were experimentally investigated. The engine tests were performed by varying the engine speed between 1000 and 4000 rpm with 500 rpm period at threefourth throttle opening position. The results showed that brakespecific fuel consumption increased while brake thermal efficiency, emissions of carbon monoxide (CO) and hydrocarbon (HCs) decreased with methanol-unleaded gasoline and ethanol-unleaded gasoline blends. It was found that a 10% blend of ethanol or methanol with unleaded gasoline works well in the existing design of engine and parameters at which engines are operating.

Keywords: engine performance, exhaust emissions, methanol, ethanol