Experimental study on the combustion characteristics of high-pressure octanal spray flames
Experimental study on the combustion characteristics of high-pressure octanal spray flames
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DOI：
10.1016/j.fuel.2019.116596
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发表时间：
2020-02
期刊：
影响因子：
7.4
通讯作者：
Irene Ruiz-Rodriguez;R. Cracknell;M. Parkes;T. Megaritis;L. Ganippa
中科院分区：
文献类型：
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作者：
Irene Ruiz-Rodriguez;R. Cracknell;M. Parkes;T. Megaritis;L. Ganippa
鉴于严格的排放条例，含氧燃料越来越受欢迎，因为它们有可能减少柴油车辆和非公路应用中的排放。探索能够与柴油的能量含量和密度相匹配的含氧物的燃烧特性，同时减少污染物的形成，是很重要的。此外，具有与柴油相似的热物理特性可以使它们成为替代燃料。本文采用双色热法研究了长碳链氧合物辛烷（C8H16O）和柴油的燃烧特性，研究了喷雾火焰中的温度和烟尘分布。这项研究是在一个类似柴油发动机的环境下，在高压和高温下，在一个光学可达的定容室中，在高压下注入燃料。辛烷的脱灰长度比柴油长，减少了烟尘的生长时间。当柴油和辛烷的注入量相同时，辛烷的燃烧速度更快，因为存在燃料结合氧。双色热分析结果表明，辛烷油的烟灰空间分布与柴油略有不同。辛烷的化学结构是一个长链烷烃，末端有一个醛官能团，没有任何芳香结构，与柴油相比，辛烷在整个燃烧过程中显著阻碍了烟灰的形成。
In view of the stringent emission regulations, oxygenated fuels are growing in popularity owing to their potential to reduce emissions in diesel vehicles and off-road applications. It is important to explore the combustion characteristics of oxygenates that can match the energy content and density of diesel whilst reducing the formation of pollutants. Furthermore, having similar thermo-physical properties to diesel could yield them as drop-in fuel candidates. In this work, the combustion characteristics of a long carbon chain oxygenate, octanal (C8H16O), and diesel, were investigated using the two-colour pyrometry method to study the temperature and soot distributions in the spray flames. This investigation was done by injecting the fuels at high pressures in an optically accessible constant volume chamber under a diesel engine-like environment, at high ambient pressures and temperatures. The soot lift-off length for octanal was longer than for diesel, which reduced the amount of time available for soot to grow. For the same injected mass of diesel and octanal, the combustion of octanal was faster due to the presence of fuel-bound oxygen. The two-colour pyrometry results revealed that the spatial distribution of soot for octanal was slightly different from that of diesel. The chemical structure of octanal, consisting of a long chain alkane with an aldehyde functional group at the end and without the presence of any aromatic structures, hindered the soot formation significantly throughout the combustion process when compared to diesel.