Performance and exhaust emissions of a turbocharged common rail DI diesel engine fueled with alcohol

Three kinds of alcohol fuels and diesel were blended and combusted in an electronic control high-pressure common rail turbocharged DI diesel engine respectively. Without any modifications in the original engine structure, the combustion characteristics and emissions of alcohol-diesel fuel were investigated. It shows that the peak heat release rate and the brake specific fuel consumption increases with the increase of mixing ratio. At the same blending ratio, the peak heat release rate of methanol-diesel is the highest, but the brake specific fuel consumption is lower; N-butanol/diesel has the lowest CO and HC emissions but has the highest NOx emissions. NOx emissions of methanol-diesel and ethanol-diesel are approximated, but CO and HC emissions of ethanol-diesel is the highest. In consideration of the fuel economy and emission performance, methanol-diesel mixing fuel is better.