Performance and Emissions of Engine Fueled with Biodiesel/Methanol Blends
Based on the complementary advantages between biodiesel and methanol,the influence of methanol addition to biodiesel on engine performance and emissions is investigated.Experimental results show that,with the increase of methanol fraction in blended fuels,the brake specific fuel consumption in-creases while the brake thermal efficiency varies little at most engine loads;with the increase of methanol proportion in the blends of biodiesel and methanol,the peak of heat release rate in the pilot injection de-creases and the heat release start time is delayed,the peak of heat release rate in the main injection in-creases after blended with methanol while heat release duration decreases;after the biodiesel is blended with methanol,CO and HC emissions of engine increase dramatically,NOx emissions decrease at low and medium loads,while increases at high load;soot emissions decrease as oxygen proportion is increased. When using biodiesel-methanol fuel,the trade-off correlation of NOx emissions and soot emissions is im-proved at low and medium loads.
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