柴油/甲醇组合燃烧特性及道路试验研究

Combustion Characteristics and Road Test of Diesel/Methanol Compound Combustion

在一台单缸增压中冷试验发动机上,研究了高转速下柴油/甲醇组合燃烧(DMCC)模式的缸内燃烧特性,结果表明DMCC模式具有预混燃烧比例成倍增加,燃烧持续时间大大缩短的特点;另外,DMCC模式的放热中心时刻提前,排气温度降低,热效率相比纯柴油模式得到大比例提高。在一辆重型卡车上进行了DMCC模式的道路试验,发现DMCC模式甲醇对柴油的替代率达到了28.28%,替换比仅为1.36,百公里平均燃料效率提高了11.15%。

The combustion characteristics of diesel/methanol compound combustion（DMCC） mode at high engine speed were investigated on a single cylinder turbocharged and intercooled testingengine. The research found that the DMCC mode had the following characteristics：the proportion of premixed combustion increased double,and the duration of burning became shorter.Besides,the centre of the heat release rate curve moved near to TDC,the exhaust temperature decreased when DMCC mode was applied,and the thermal efficiency was significantly improved compared to pure diesel mode.Road tests of DMCC mode were also carried out on a heavy truck.The test results showed that the substitution ratio of methanol to diesel reached to 28.28%,the exchange ratio was just 1.36,and the mean fuel efficiency per 100 km was improved by 11.15%.