Combustion characteristics, performance and emissions from a diesel power generator fuelled by B7-ethanol blends

The effects of fuel blends containing 5, 10 and 15wt.% of anhydrous ethanol in diesel oilwith 7% of biodiesel (B7) on performance, emissions and combustion characteristics of a diesel power generator are investigated. The engine was tested with its original configuration, with the fuel blends directly injected into the combustion chamber, and the applied load varied from5 to 37.5 kW. The resultswere comparedwith standard B7 operation, and showed that in in-cylinder peak pressure and heat release rate were decreased at lowloads and increased at high loads with the use of ethanol. Increasing ethanol concentration caused increased ignition delay, decreased combustion duration and reduced exhaust gas temperature. The use of ethanol decreased carbon dioxide (CO2) emissions, up to 8.6% lower than B7. Carbon monoxide (CO), total hydrocarbons (THC) and oxides of nitrogen (NOX) emissions showed different behavior, depending on load and ethanol concentration