Combustion and emissions of a DI diesel engine fuelled with diesel-oxygenate blends

Combustion and emissions of a DI diesel engine fuelled with diesel-oxygenate blends
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以柴油-含氧混合物为燃料的 DI 柴油发动机的燃烧和排放

DOI:
10.1016/j.fuel.2008.02.017
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发表时间:
2008-09
期刊:
影响因子:
7.4
通讯作者:
--
中科院分区:
工程技术1区
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--
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研究了以柴油-氧混合燃料为燃料的直喷柴油机的燃烧和排放。结果表明,柴油-二lyme混合燃料的十六烷值高于柴油,而其他五种含氧化合物的十六烷值低于柴油,两者在燃烧过程中表现出不同的行为。在不增加nox和发动机热效率的情况下,随着共混物中氧质量分数的增加,烟气浓度降低。烟雾的减少与混合物的含氧量密切相关。CO和HC浓度随共混物中氧质量分数的增加而降低。与使用纯柴油燃料的传统柴油发动机不同,使用柴油-含氧混合物的发动机与氧气质量分数的氮氧化物/烟雾权衡曲线较为平缓。
Combustion and emissions of a DI diesel engine fuelled with diesel-oxygenate blends were investigated. The results show that there exist the different behaviors in the combustion between the diesel-diglyme blends and the other five diesel-oxygenate blends as the diglyme has the higher cetane number than that of diesel fuel while the other five oxygenates have the lower cetane number than that of diesel fuel. The smoke concentration decreases regardless of the types of oxygenate additives, and the smoke decreases with the increase of the oxygen mass fraction in the blends without increasing the NOxand engine thermal efficiency. The reduction of smoke is strongly related to the oxygen-content of blends. CO and HC concentrations decrease with the increase of oxygen mass fraction in the blends. Unlike conventional diesel engines fueled with pure diesel fuel, engine operating on the diesel-oxygenate blends presents a flat NOx/Smoke tradeoff curve versus oxygen mass fraction.
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