乙醇与柴油混合燃料燃烧特性及排放特性的试验研究

在一台YC4112ZLQ增压柴油机上进行了不加任何助溶剂和着火改进剂的情况下,无水乙醇与柴油混合对柴油机燃烧过程影响的研究。试验结果表明,随着混合燃料中乙醇比例的提高,滞燃期延长,放热峰值增大,缸内最大爆发压力和最大压力升高率升高。与柴油相比,E10和E20有效热效率与原机相当,E30在高速大负荷工况热效率降低,NOx和碳烟排放明显降低;但HC和CO排放随着混合燃料中乙醇比例的增大,发动机转速为1500 r／min时,HC排放和CO排放均降低,发动机转速为2300 r／min时,HC排放和CO排放均有所升高。

Experimental Investigation on Combustion and Emission Characteristics of Engine Fuelled with Ethanol-Diesel Blends

The effects of ethanol-diesel blends on engine combustion and emission characteristics were investigated. Experiments were carried out on a turbo-charged inter-cooled YC4112ZLQ diesel engine. The results show that, with the increase of ethanol ratio, the ignition timing is delayed, and the maximum value of heat release rate is increased, leading to the increase in peak cylinder pressure and maximum rate of pressure rise. The effective thermal efficiencies of E10 and E20 are almost the same as that of the diesel fuel, while thermal efficiency of E30 decreases at high speed and heavy load. Compared with the diesel engine, both NOx emission and smoke are reduced, while HC and CO emission are related to the ethanol ratio and engine speed. With the increase of ethanol ratio, HC and CO emissions decrease at engine speed of 1500 r/min, but they give the increase at engine speed of 2300 r/min.