Experimental investigation on emission characteristics of high reactivity gasoline compression ignition with different EGR and injection pressure strategies
Experimental investigation on emission characteristics of high reactivity gasoline compression ignition with different EGR and injection pressure strategies
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DOI：
10.1016/j.fuel.2022.126176
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发表时间：
2023-01
期刊：
影响因子：
7.4
通讯作者：
Zexian Guo;Boyuan Wang;Shiyu Liu;Zhaohuan Zhang;Buyu Wang;Chen-Teng Chang;Peng Wang;Xin He;Xingyu Sun;S. Shuai
中科院分区：
文献类型：
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作者：
Zexian Guo;Boyuan Wang;Shiyu Liu;Zhaohuan Zhang;Buyu Wang;Chen-Teng Chang;Peng Wang;Xin He;Xingyu Sun;S. Shuai
在柴油发动机中使用高活性汽油（HRG）是一种有前途的方法，可以在不改变发动机硬件的情况下同时减少NOx和碳烟排放。在一台6缸重型柴油机上，采用不同的EGR率和喷射压力策略，对HRG和柴油机排放特性进行了试验研究。研究了欧洲稳定循环（ESC）中的四个运行点：A25、A75、C25和C75。应用先导-主喷射策略，并且调节喷射正时以保持50%热释放（CA 50）的恒定曲柄角。结果表明，与柴油机相比，HRG可以在较低的喷射压力下实现较低的碳烟质量排放，同时保持超低的NOx排放水平（2-3 g/kWh），这表明其燃料喷射和后处理系统的成本较低。还分析了两种燃料的粒度分布。在高EGR率下，无论是HRG还是柴油机，均以积聚型颗粒为主。然而，在低EGR率下，柴油比HRG产生更多的核态颗粒。这一现象可以用石蜡和芳烃组分之间芘和乙炔生成量的差异来解释。
Using a High Reactivity Gasoline (HRG) in diesel engines is a promising approach to reduce NOx and soot emissions simultaneously without modifying the engine hardware. In this study, an experimental investigation on HRG and diesel emission characteristics was conducted in a six-cylinder heavy duty diesel engine with different exhaust gas recirculation (EGR) rate and injection pressure strategies. Four operation points, A25, A75, C25, and C75 in the European Steady Cycle (ESC), were studied. The pilot-main injection strategy was applied, and injection timing was adjusted to maintain a constant Crank Angle of 50 % heat release (CA50). The results show that, compared with diesel, HRG can achieve lower soot mass emission while maintaining an ultra-low NOx emission level (2–3 g/kWh) with a lower injection pressure, indicating lower cost in the fuel injection and aftertreatment systems. The particle size distribution was also analyzed for both fuels. Under high EGR rates, the accumulation mode particles were dominant for both HRG and diesel. However, under low EGR rates, diesel produced much more nucleation mode particles than HRG. The phenomenon can be explained by the difference in the pyrene and acetylene productions between paraffin and aromatic compositions.