Combustion process investigation in a high speed diesel engine fuelled with n-butanol diesel blend by conventional methods and optical diagnostics.

摘要: Abstract The use of alternative fuels, as biodiesel and ethanol, for light duty CI engines to approach the target ultra low NOx PM emissions without fuel economy penalty has been widely investigated. Recently, it is growing interest in butanol a viable either single or blended with conventional based fuels both cut demand fossil reduce particulate matter significantly increasing NOx. In this paper, effects on combustion process were investigated through methods optical diagnostics. First, blends 80% diesel 20% n-butanol (BU20) used four cylinder, turbocharged, water cooled, DI engine, equipped common rail injection system. Management timing pressure was carried out achieve conditions which almost total amount delivered before auto-ignition. BU20 allowed attain smokeless at lower (100 MPa) than (120 MPa). Smokeless achieved slight increase (around 20%) minor specific consumption. Afterward, studied chamber cylinder compression ignition engine same multi-jets Spray pollutant formation by UV–visible digital imaging natural emission spectroscopy. spectroscopy detection chemical markers process. Chemiluminescence signals, due OH, HCO CO2 bands detected. OH correlated measured exhaust. soot spectral feature visible wavelength range related emissions.