Effect of Air Fuel Ratio on Performance and Emission of a Capacitive Discharge Ignition Engine Fuelled with Ethanol-Gasoline Blends
Authors
MUHAMMAD ALAM ZAIB KHAN, MUHAMMAD ALI KAMRAN, NAVEED AHMAD, HAFSA SHER KHAN, MUHAMMAD SUHAIB and SADDAM HUSSAIN
Abstract
The focus of this research is to find the effect of air-fuel ratio on engine performance and emissions fueled with ethanol-gasoline blends. This study was conducted using a single cylinder four stroke spark ignition engine, a dynamometer, and an emission analyzer. The air-fuel ratio was manually controlled, and then several percentages of ethanol-gasoline blends were utilized in the engine. Torque, braking specific fuel consumption, carbon dioxide (CO2), carbon monoxide (CO), and unburned hydrocarbons (HC) performance and emission tests were done at various air-fuel ratios and engine speeds. Leaning the air fuel ratio reduced CO2 and HC emissions in the same way that pure gasoline did, but unlike pure gasoline, ethanol blends had superior combustion characteristics at lean operating limits and greater engine speeds. Leaning the air-fuel ratio and utilizing ethanol-gasoline blends resulted in considerable reductions in CO and HC emissions. From the analysis of the collected experimental data, it was found that at air-fuel ratios above stoichiometric using E10 will result in lowest CO and HC emissions without compromising engine torque, and E15 will result in lowest BSFC.
