聚甲氧基二甲醚与柴油混合燃料的燃烧与排放特性

Combustion and emission characteristics of diesel engines fuelled by polyoxymethylene dimethyl ethers(PODE_n)

聚甲氧基二甲醚（PODEn）是一种高含氧、高十六烷值的新型燃料。为了降低柴油机的颗粒物排放，该文在一台轻型柴油机和一台重型柴油机上对柴油和10％、20％PODE3-4／柴油混合燃料进行了燃烧、排放和热效率的测试。结果表明：添加20％的PODE3-4，轻型柴油机大负荷工况下的碳烟排放下降90％，指示热效率能够提高2％；重型柴油机欧洲稳态循环（ESC）的颗粒物（PH）排放下降36．2％，有效热效率上升0．8％。添加PODE3-4，在指示平均有效压力（IMEP）为0．2～0．6MPa时，对放热率曲线影响不大；在IMEP为0．8MPa时，使主喷放热的滞燃期延长，主喷放热峰值增加。因此，PODE。是很有前景的柴油添加成分。

How to use the Polyoxymethylene Dimethyl Ethers （PODEn） was investigated, which is a new fuel having high oxygen contents and high cetane number, to reduce particulate matter （PM） from diesel engines. The combustion, the emission characteristics, and the thermal efficiency were tested for a diesel, a fuel with 10% PODE3-4/diesel blend, and a fuel with 20% PODE3-4/diesel blend both in a light-duty （LD） single cylinder diesel engine and in a six-cylinder heavy-duty （HD） production diesel engine. The results show that by adding 20% PODE3-4, soot emissions decreases by 90% for the LD diesel engine, the thermal efficiency increases by 2% at high load; PM emissions decreases by 36.2% for the HD engine in European Stationary Cycle （ESC）, the average thermal efficiency increases by 0.85% in ESC. At 0.2-0.6 MPa Indicated Mean Effective Pressure （IMEP）, adding PODE3-4 has no significant effects on heat release curves; at 0.8 MPa IMEP, adding PODE3-4 increases ignition delay and increases the main heat release peak. Therefore, PODEn is a promising blending component of diesel fuel.