The effect of oxygenate fuels on PN emissions from a highly boosted GDI engine
The effect of oxygenate fuels on PN emissions from a highly boosted GDI engine
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DOI：
10.1016/j.fuel.2018.03.148
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发表时间：
2018-08
期刊：
影响因子：
7.4
通讯作者：
F. Leach;R. Stone;D. Richardson;J. Turner;A. Lewis;S. Akehurst;S. Remmert;S. Campbell;R. Cracknell
中科院分区：
文献类型：
--
作者：
F. Leach;R. Stone;D. Richardson;J. Turner;A. Lewis;S. Akehurst;S. Remmert;S. Campbell;R. Cracknell
汽油直喷（GDI）发动机在市场上越来越多地可用。已知这种发动机比其进气道燃料喷射的前辈排放更多的颗粒物（PM）。市场上也广泛使用柴油燃料，最多使用E85的混合物，并且广泛研究了它们对PN排放的影响。在这项工作中，从一台能够在高达35 bar制动平均有效压力（BMEP）下运行的高增压发动机上，测量了基准汽油和三种不同的柴油机燃料的PN排放（E20、E85和GEM -汽油、乙醇和甲醇的共混物）。发动机已经运行在四个不同的工作点，和一些发动机参数有关的高增压发动机（如EGR、排气背压和λ）进行了测试-从所有这些测量了PN排放和尺寸分布。结果表明，燃料的NOx含量对其PN排放有非常大的影响，E85在整个工作范围内提供低水平的PN排放，GEM根据工作点提供非常低和极高水平的PN排放。这些结果已经过分析，并与关键燃料特性相关联。
Gasoline Direct Injection (GDI) engines are increasingly available in the market. Such engines are known to emit more Particulate Matter (PM) than their port-fuel injected predecessors. There is also a widespread use of oxygenate fuels in the market, up to blends of E85, and their impact on PN emissions is widely studied. However the impact of oxygenate fuels on PN emissions from downsized, and hence highly-boosted engines is not known.In this work, PN emissions from a highly boosted engine capable of running at up to 35 bar Brake Mean Effective Pressure (BMEP) have been measured from a baseline gasoline and three different oxygenate fuels (E20, E85, and GEM – a blend of gasoline, ethanol, and methanol) using a DMS500. The engine has been run at four different operating points, and a number of engine parameters relevant to highly-boosted engines (such as EGR, exhaust back pressure, and lambda) have been tested – the PN emissions and size distributions have been measured from all of these.The results show that the oxygenate content of the fuel has a very large impact on its PN emissions, with E85 giving low levels of PN emissions across the operating range, and GEM giving very low and extremely high levels of PN emissions depending on operating point. These results have been analysed and related back to key fuel properties.