Combustion and emissions characteristics of toluene/n-heptane and 1-octene/n-octane binary mixtures in a direct injection compression ignition engine
Combustion and emissions characteristics of toluene/n-heptane and 1-octene/n-octane binary mixtures in a direct injection compression ignition engine
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DOI：
10.1016/j.combustflame.2013.04.016
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发表时间：
2013-10-01
影响因子：
4.4
通讯作者：
Rogerson, John
中科院分区：
文献类型：
--
作者：
Hellier, Paul;Ladommatos, Nicos;Rogerson, John
下一代液体燃料将来自一系列生物质和化石来源，成功地设计和有效利用这种燃料，需要了解在当前发动机技术中使用时结构相似和不同的燃料成分之间的相互作用。燃料组分之间的相互作用可以通过确定燃料的自燃行为来影响压燃燃烧中能量的释放和有害排放的产生。本文在一台单缸发动机上进行了一系列二元混合燃料的试验研究，以研究燃料组分相互作用对直喷式压缩点火自燃的影响。对甲苯和正庚烷以及正辛烯和正辛烷组成的一系列二元混合物进行了试验，分别观察了芳香族化合物和烯烃对正构烷烃燃烧和排放的影响。发动机试验是在恒定喷射正时进行的，并在恒定点火正时和恒定点火延迟时重复进行，后者是通过在各种燃料中添加少量点火改进剂(2-乙基己基硝酸酯)来实现的。甲苯/正庚烷二元混合气中甲苯的存在增加了着火延迟时间，并产生了明显的两阶段着火过程。1-辛烯/正辛烷二元混合物中1-辛烯含量的增加也增加了着火延迟，但在甲苯/正庚烷混合物中增加的程度要比甲苯小得多。对于甲苯/正庚烷混合物，燃料组分之间在点火延迟期内的相互作用似乎很重要，但对于1-辛烯/正辛烷混合物则不重要。在恒定喷射和恒定点火时刻，燃烧阶段和各二元混合气产生的排放水平主要受点火延迟时间的影响。在点火延迟相等的情况下，绝热火焰温度对NOx生成的影响是明显的。(C)2013年，燃烧研究所。爱思唯尔公司出版，版权所有。
Successfully designing and making effective of use of the next generation of liquid fuels, which will be derived from a range of biomass and fossil sources, requires an understanding of the interactions between structurally similar and dissimilar fuel components when utilised in current engine technology. Interactions between fuel components can influence the release of energy and production of harmful emissions in compression ignition combustion through determination of the autoignition behavior of the fuel. This paper presents experimental studies carried out in a single-cylinder engine supplied with a range of binary mixture fuels to investigate the effect of fuel component interactions on autoignition in direct injection compression ignition. A range of binary mixtures consisting of toluene and n-heptane and also 1-octene and n-octane were tested so as to observe respectively the effect of an aromatic compound and an alkene on n-alkane combustion and emissions. The engine tests were carried out at constant injection timing and they were repeated at constant ignition timing and at constant ignition delay, the latter being achieved through the addition to the various fuels of small quantities of ignition improver (2-ethylhexyl nitrate). Increasing the presence of toluene in the toluene/n-heptane binary mixtures resulted in an increased ignition delay time and generated a distinct two stage ignition process. An increased level of 1-octene in the binary mixtures of 1-octene/n-octane was also found to increase ignition delay, though to a much lesser extent than toluene in the case of the toluene/n-heptane mixtures. Interactions between the fuel components during the ignition delay period appear important in the case of the toluene/n-heptane mixtures but not those of 1-octene/n-octane. At constant injection and constant ignition timings, the combustion phasing and the level of emissions produced by each binary mixture were primarily driven by the ignition delay time. With ignition delay equalised, an effect of adiabatic flame temperature on NOx production was visible. (C) 2013 The Combustion Institute. Published by Elsevier Inc. All rights reserved.