直喷式柴油机燃用二甲基醚(DME)试验研究  

Experimental Investigation on Burning Dimethyl Ether (DME) in Direct Injection Diesel Engine

作　　者：尧命发[1] 许斯都[1] 罗毅[1] 

机构地区：[1]天津大学内燃机燃烧学国家重点实验室,天津300072

出　　处：《燃烧科学与技术》2002年第3期252-257,共6页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目 (599760 2 8)

摘　　要：介绍了在 110 0单缸直喷式柴油机上燃用 DME的发动机试验研究结果。研究表明 :通过增加循环供油量可使柴油机燃用 DME后恢复到原机功率 ;柴油机燃用 DME后 ,中低速扭矩比原柴油机高 ,标定转速扭矩比原机略低 ,同时缸内最大爆发压力降低 ,发动机碳烟排放为零 ,HC和 CO排放比原机略高 ,NOx 排放比原柴油机降低约5 0 %以上 ;供油提前角减小 ,缸内最大爆发压力降低 ,NOx 排放可进一步大幅度降低 ,但 HC排放略有升高 ;加大喷孔直径 ,缸内爆发压力升高 ,NOx 排放升高 ,HC和 CO排放在中低负荷相差不大 。This paper introduces the experiment on a single cylinder direct injection diesel fuelled with Dimethyl Ether (DME). The results show that the power of the engine fuelled with DME equals to that of the original engine by enlarging the cycle fuel, and the torque of the DME engine is larger than that of a diesel engine at a middle and low rotate speed, but smaller in high speed. Compared with the original diesel engine, the ignition delay was smaller, and the largest heat release rate was much lower, which result in a much lower maximum cylinder pressure. Also, NOx emissions reduced more than 50%, HC nd CO emissions increased slightly and the engine was free smoke emissions on burning DME. With the delaying of the injection time, the cylinder pressure and NOx emissions is decreased, but the HC and CO emissions is increased. By enlarging the orifice diameter, the maximum pressure in the cylinder of DME engine is increased, and the combustion duration is decreased. It is an effective way to reduce the fuel consumption. However, it results in the increase of NOx emissions, and HC and CO emissions increase under a high load.

关 键 词：柴油机 二甲基醚 缸内压力 排放 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]