柴油—乙醇混合燃料直接在柴油机上使用的试验研究

A Study on the Feasibility of the Diesel-ethanol Fuel Used Directly for Diesel Engines

阐述了进行柴油-乙醇混合燃料研究的必要性,对柴油、乙醇的主要理化性能进行了对比分析,利用添加剂解决了柴油与乙醇混合时由于存在分层现象而不能在柴油机上直接使用的关键问题,并根据筛选出的添加剂进行了柴油、乙醇的混合试验,得到了可直接用于柴油机的柴油—乙醇混合燃料(DEF),为在柴油机上直接燃用DEF提供了理论依据。在X195型柴油机上不改变原机结构的条件下,分别使用纯柴油和DEF进行了负荷特性和排烟性能的台架对比试验。结果表明:在柴油机上直接使用DEF是完全可行的;与使用纯柴油相比,燃用DEF时,柴油机的冷启动性不变,燃料经济性、热效率均有所提高,排烟度降低。

This paper expatiates on the significance of mixied fuel of diesel oil and ethanol. It analyzes comparaively the basic phys- ical and chemical performances. By using additive, it solves the crux which can't be used directly in diesel engine because of layering during mixing of diesel oil and ethanol. Tests have been done to find out the mixed fuel of diesel oil and ethanol(DEF) which can be used directly for diesel engines. The power characteristics and exhaust smoke density of the type of X195 diesel en- gine by using diesel fuel and DEF respectively were tested on the test-bed. The results show that, when the engine used DEF, the cold-start performance doesn't chang, the fuel economy and heat efficiency are better and the exhaust smoke density is less.