University of Birmingham Impact of Fuel and Injection System on Particle Emissions from a GDI Engine
University of Birmingham Impact of Fuel and Injection System on Particle Emissions from a GDI Engine
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发表时间：
2014
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通讯作者：
Chongming Wang;Hongming Xu;J. Herreros;Jianxin Wang;R. Cracknell
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作者：
Chongming Wang;Hongming Xu;J. Herreros;Jianxin Wang;R. Cracknell
近年来，汽油直喷（GDI）发动机的颗粒物排放，特别是超细颗粒物的排放已成为人们关注的问题。在化学计量空燃比、1500 rpm发动机转速和3.5-8.5 bar IMEP工况下，研究了燃油（汽油与乙醇）和喷射系统（喷射压力和喷油器工况）对单缸喷射式直喷发动机颗粒排放的影响。结果表明，与汽油相比，在喷雾引导GDI发动机中，乙醇燃烧产生的颗粒质量（PM）要低得多，但颗粒数（PN）要高得多。根据所使用的燃料，PM和PN排放对喷射压力和喷油器状态的响应不同。对于汽油，喷射系统对PM和PN排放有显著影响。高的喷射压力和清洁的喷油器条件是实现低颗粒排放的必要条件。与汽油相比，乙醇燃烧产生的颗粒排放对喷射系统不太敏感，因为它具有更高的挥发性和扩散燃烧，产生的烟尘较少。此外，当使用汽油和乙醇以及使用高喷射压力时，观察到PM和PN的权衡。
In recent years, particulate emissions from the gasoline direct injection (GDI) engine, especially the ultrafine particulates, have become a subject of concern. In this study, the impact of fuel (gasoline versus ethanol) and injection system ( injection pressure and injector condition ) on particle emissions was investigated in a single cylinder spray-guided GDI research engine, under the operating conditions of stoichiometric air/fuel ratio, 1500 rpm engine speed and 3.5-8.5 bar IMEP. The results show that, in a spray guided GDI engine, ethanol combustion yields much lower particle mass (PM) but higher particle number (PN) emissions, compared to gasoline. Depending on the fuel used, the PM and PN emissions respond differently to injection pressure and injector condition. For gasoline, the injection system has a significant impact on the PM and PN emissions. High injection pressure and clean injector condition are both essential for low particle emissions. Compared to gasoline, the particle emissions from ethanol combustion is less sensitive to the injection system, due to its higher volatility and diffusive combustion which produces less soot. Furthermore, a PM and PN trade-off was observed when using gasoline and ethanol, and when using high injection pressures.