Experimental study on particulate emission of a diesel engine fueled with blended ethanol-dodecanol-diesel

摘要

Experiments were conducted on a 4-cylinder direct-injection diesel engine which has a compressing ratio of 19,using ultra low sulfur diesel blended with ethanol using 1 -1.5% by volume of 1-dodecanol as the solvent to investigate the particulate emissions of the engine under five engine loads and at engine speeds of 1800 and 2400rev/min.Blended fuels containing 6.1%,12.2%,18.2% and 24.2% by volume of ethanol,corresponding to 2%,4%,6% and 8% by mass of oxygen in the blended fuel,were used.At both engine speeds,with an increase in ethanol in the fuel,the smoke opacity,the particulate mass concentration and the total number of nano-size particles are all reduced.A diesel oxidation catalyst(Finnkat)was used and found to further reduce particulate emission.The smoke opacity,the particulate mass concentration and the total number concentration at 2400 rev/min are higher than those at 1800 rev/min.