Effects of Ethanol on Combustion and Emission Characteristics of Rapeseed Oil/Diesel Blend
In order to improve the performance of engine burning high proportion biomass mixed fuel,10%,20%and 30%ethanol by volume were added to the medium proportion of rapeseed oil/diesel blends.Rapeseed oil/diese/ethanol blends(VD50E10,VD50E20 and VD50E30)were made under the action of cosolvent,and its main performance was tested.Under different loads of 1800 r/min,the effects of ethanol blending ratio on the combustion and emission characteristics of medium proportion rapeseed oil/diesel blends were studied and compared with diesel fuel.The results show that,with the increase of ethanol volume fraction in the blends,the combustion start time of blends were delayed at low load,and the peak values of in cylinder peak pressure and instantaneous heat release rate gradually decreased,which of VD50E30 is the smallest.At high load,the peak value of instantaneous heat release rate of blends increased,the peak pressure in cylinder of VD50E30 was slightly higher than that of other fuels,and the peak pressure in cylinder of diesel was the smallest.With the increase of ethanol volume fraction in the blends,the CO and HC emissions of blends increased,and the soot and NOx emissions decreased.Under some operating conditions,the soot emission of VD50E30 was lower than that of diesel.
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