Investigation the effect of fuel injection strategies on combustion and morphology characteristics of PM in modern diesel engine operated with oxygenate fuel blending
Investigation the effect of fuel injection strategies on combustion and morphology characteristics of PM in modern diesel engine operated with oxygenate fuel blending
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DOI：
10.1016/j.tsep.2022.101476
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发表时间：
2022-09-18
影响因子：
4.8
通讯作者：
Dearn, K. D.
中科院分区：
文献类型：
--
作者：
Fayad, M. A.;Tsolakis, A.;Dearn, K. D.
通过提高对油烟形成过程的认识和使用含氧清洁燃料的燃油喷射影响策略，可以减少柴油发动机的油烟排放。在现代柴油发动机上，研究了含氧燃料（B20）与喷油正时和压力策略对燃烧特性和颗粒物（PM）的综合影响。研究了不同注射策略下B20对颗粒物浓度、初生颗粒数（npo）、旋转半径（Rg）和分形维数（Df）等形貌参数的影响。结果表明，B20燃烧时的缸压平均值和ROHR（热释放率）分别比柴油高3%和11%。结果表明：与柴油燃烧相比，B20燃烧后的颗粒物粒径分布（PSD）有所降低；在没有燃油后喷（PI）的情况下，高喷射压力下的PSD也有相同的变化趋势，而当燃油后喷（PI）存在时，PSD增大。与柴油相比，不同喷油方式下B20燃烧时烟尘形态参数（npo和Rg）均有所降低。有喷油和无喷油时，喷油压力越高，烟尘颗粒的数量和尺寸越小。此外，形貌特征略有改变，观察到在不同喷射压力下，两种燃料的npo和Rg在PI的作用下都有所降低。有PI策略下B20燃烧后的分形维数（Df）降低了1.41，无PI策略下的分形维数（Df）降低了1。与柴油燃料相比，它是43。
The soot emissions can be decreased in diesel engine through an improved understanding of the soot formation processes and impact strategies of fuel injection using oxygenated cleaner fuel. The combined effect of the oxygenated fuel (B20) and strategies of fuel injection (FI) timings and pressures on characteristics of combustion and particulate matter (PM) was studied in modern diesel engine. The influence of B20 on PM concentration and morphology parameters such as number of primary particles (npo), radius of gyration (Rg) and fractal dimension (Df) were also investigated under different injection strategies. It is found that the average values of cylinder pressure and ROHR (rate of heat release) from B20 combustion are higher than diesel fuel by 3% and 11%, respectively. The results showed that the particulate size distribution (PSD) of PM reduced from the combustion of B20 compared to the diesel fuel combustion. The same trends were obtained for high injection pressure without fuel post-injection (PI), while PSD increased when fuel PI is presented. The soot morphology parameters (npo and Rg) are reduced during B20 combustion compared with diesel fuel under the various injection strategies. The number and size of soot particles was smaller with high injection pressure for with PI and without PI. Furthermore, the morphology characteristics were slightly modified, observing reduction in npo and Rg under engagement of PI for both fuels under different injection pressures. The fractal dimension (Df) decreased from the combustion of B20 under PI strategy by 1.41and without PI by 1. 43 when compared to the diesel fuel.