Experimental and numerical study on the effect of single-hydroxybenzene/n-heptane blends on engine combustion and particulate emissions
Experimental and numerical study on the effect of single-hydroxybenzene/n-heptane blends on engine combustion and particulate emissions
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DOI：
10.1016/j.fuel.2020.120067
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发表时间：
2021-04
期刊：
影响因子：
7.4
通讯作者：
Haozhong Huang;Xiaoyu Guo;Binjing Deng;Mingxin Liu;Yajuan Chen;Han Lei;Rong Huang
中科院分区：
文献类型：
--
作者：
Haozhong Huang;Xiaoyu Guo;Binjing Deng;Mingxin Liu;Yajuan Chen;Han Lei;Rong Huang
了解柴油的主要成分对发动机燃烧和排放的影响是建立柴油机模型的必要条件。在本研究中，柴油中的直链烷烃以正庚烷为代表，芳烃以甲苯、正丁基苯和1,2,4-三甲苯为代表。通过实验和仿真研究了单羟基苯/正庚烷混合燃料对发动机性能和颗粒排放特性的影响，以确定模型柴油的最佳组成。试验燃料为纯柴油（D100）和单羟基苯/正庚烷混合物（甲苯、正丁基苯和1,2,4-三甲苯各以20% （T20、BBZ20、TMB20）或30% （T30、BBZ30、TMB30）的体积比加入正庚烷）。结果表明：随着EGR速率的增大，总颗粒数浓度（TPNC）、粒径分布浓度（PSDC）、总颗粒质量浓度（TPMC）和颗粒几何平均直径（PGMD）均增大；单羟基苯/正庚烷的峰值放热速率（HRR）和峰值缸内压力（IP）均高于D100；而PSDC、TPNC、TPMC、PGMD值均低于D100。在测试燃料中，正丁基苯/正庚烷混合燃料对发动机性能和颗粒排放特性的影响最接近D100。BBZ20的温度场、等效比、oh -基团和NO的空间分布与D100接近。正丁苯/正庚烷燃料适合模拟柴油，特别是当正丁苯添加比为20%时，其燃烧和排放特性与D100最接近。
Understanding the influence of the primary components of diesel on engine combustion and emissions is essential to the construction of a model diesel fuel. In this study, straight-chain alkanes in diesel are represented by n-heptane, and aromatic hydrocarbons are represented by toluene, n-butylbenzene, and 1,2,4-trimethylbenzene. The effect of single-hydroxybenzene/n-heptane blended fuel on engine performance and particle emission characteristics is studied experimentally and by simulation to identify an optimal composition for a model diesel fuel. The test fuels were pure diesel (D100) and single-hydroxybenzene/n-heptane blends (toluene, n-butylbenzene and 1,2,4-trimethylbenzene each of which was added to n-heptane at a volume ratio of 20% (T20, BBZ20, TMB20) or 30% (T30, BBZ30, TMB30)). The results show that as the EGR rate increases, the total particle number concentration (TPNC), particle size distribution concentration (PSDC), total particle mass concentration (TPMC), and particle geometric mean diameter (PGMD) increase. The peak heat release rate (HRR) and peak in-cylinder pressure (IP) of single-hydroxybenzene/n-heptane are higher than those of D100; however, the values of PSDC, TPNC, TPMC, and PGMD are lower than those of D100. Among the tested fuels, the effects of n-butylbenzene/n-heptane blend on engine performance and particle emission characteristics are closest to D100. The spatial distribution of temperature field, equivalent ratio, OH-groups and NO of BBZ20 are close to that of D100. The n-butylbenzene/n-heptane fuel is suitable for modeling diesel, particularly when the addition ratio of n-butylbenzene is 20%, the combustion and emission characteristics are the closest to those of D100.