Pilot ignited premixed combustion of dimethyl ether in a turbodiesel engine
Pilot ignited premixed combustion of dimethyl ether in a turbodiesel engine
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DOI：
10.1016/j.fuproc.2008.08.010
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发表时间：
2008-12
影响因子：
7.5
通讯作者：
Elana Chapman;A. Boehman
中科院分区：
文献类型：
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作者：
Elana Chapman;A. Boehman
本文描述了二甲醚在共轨涡轮柴油机中的燃烧研究，其中二甲醚被熏蒸到进气中，并使用常规柴油喷射，目的是点燃预混二甲醚-空气装药。这种燃烧过程在这里被称为“混合模式”过程，在某些方面类似于通常被称为“双燃料”燃烧。然而，与气态燃料通常是天然气或沼气的“双燃料”燃烧不同，在使用二甲醚的过程中，气态燃料的点燃在很大程度上独立于柴油喷射。柴油喷射是通过一次主喷射完成的。发动机以单一速度和负荷运转。对气体和颗粒排放进行了监测，并进行了热释放分析，以检查燃料如何燃烧以及在不同程度上用熏蒸二甲醚替代柴油时对排放形成的影响，二甲醚的燃料能量高达44%。二甲醚熏蒸可减少nox排放，增加颗粒物排放。PM排放的增加归因于柴油喷雾的富集，这是由于熏蒸二甲醚取代了吸入的氧气，尽管二甲醚具有广泛观察到的抑烟作用。
This paper describes combustion studies of dimethyl ether in a common rail turbodiesel engine wherein the dimethyl ether was fumigated into the intake air and the conventional diesel injection was used with the intention of igniting the premixed DME-air charge. This combustion process is referred to here as a “mixed mode” process and is similar in some respects to what is commonly referred to as “dual fuel” combustion. In contrast to “dual fuel” combustion, however, in which the gaseous fuel is often natural gas or biogas, in this process with DME the gaseous charge ignites largely independently of the diesel injection. The diesel injection was accomplished with a single, main injection. The engine was operated at a single speed and load. Gaseous and particulate emissions were monitored and heat release analysis was performed to examine how the fuels burn and the impact on emissions formation at various levels of substitution of diesel fuel with fumigated DME, at as high as 44% of the fuel energy from DME. Reductions in NOxemissions and increases in particulate matter emissions are observed with DME fumigation. The increase in PM emissions is attributed to enrichment of the diesel fuel spray, due to displacement of intake oxygen by the fumigated DME, despite the widely observed soot suppressing effect of DME.