| Summary: | The article presents comparative bench testing results of a four stroke, four cylinder, direct injection, unmodified, naturally aspirated diesel engine operating on baseline (DF) arctic class 2 diesel fuel (80 vol %), rapeseed methyl ester (5 vol %) and anhydrous (200 proof) ethanol (15 vol %) blend (B5E15). The purpose of the research is to investigate the effect of simultaneous ethanol and RME addition into diesel fuel on brake mean effective pressure (bmep) of the engine, its brake specific fuel consumption (bsfc), the brake thermal efficiency ( e) and emission composition changes, including NO, NO2, NOx, CO, CO2, HC and smoke opacity of the exhausts. The bsfc of a fully loaded engine operating on ethanol-diesel-biodiesel blend B5E15 under bmep = 0.75, 0.76 and 0.68 MPa is higher by 10.30 %, 10.71 % and 9.65 % because of both net heating value of biofuel lower by 6.18 % comparing with diesel fuel and brake thermal efficiency lower by 5.56 %, 2.86 % and 2.86 % relative to that of neat diesel fuel at corresponding 1400, 1800 and 2200 min-1 speeds. The maximum NOx emissions emanating from blend B5E15 are lower by 13.4 %, 18.0 % and 12.5 % and smoke opacity is diminished by 13.2 %, 1.5 % and 2.7 % throughout a whole speed range relative to their values measured from neat diesel fuel. As a reasonable payoff for NOx related advantages, CO amounts from oxygenated blend BE15 are lower by 6.0 % for low 1400 min-1 speed and they are bigger by 20.1 % and 28.2 % for a higher 1800 and 2200 min-1 speeds and emissions of HC are higher by 35.1 %, 25.5 % and 34.9 % relative to that measured from neat diesel fuel at corresponding 1400, 1800 and 2200 min-1 speeds Vytauto Didžiojo universitetas Žemės ūkio akademija
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