Effects of EGR rates on combustion and emission characteristics in a diesel engine with n-butanol/PODE3-4/diesel blends
Effects of EGR rates on combustion and emission characteristics in a diesel engine with n-butanol/PODE3-4/diesel blends
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DOI：
10.1016/j.applthermaleng.2018.09.126
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发表时间：
2019-01-05
影响因子：
6.4
通讯作者：
Wang, Yaodong
中科院分区：
文献类型：
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作者：
Huang, Haozhong;Li, Zhongju;Wang, Yaodong
在柴油机上进行了EGR率（0-40%）对正丁醇/柴油/PODE 3 -4混合燃料低温燃烧和排放特性影响的试验研究。结果表明，在相同EGR率下，与D100（柴油）相比，BD 20（体积分数为20%的丁醇和80%的柴油）的平均缸压峰值和放热率峰值均增大，滞燃期延长，制动热效率提高。BD 20掺烧PODE 3 -4后，滞燃期缩短，制动热效率和燃烧效率提高。当EGR率低于30%时，随着EGR率的增加，碳烟、CO和HC的排放量变化不大，而NOx的排放量急剧下降;当EGR率高于30%时，随着EGR率的增加，碳烟、CO和HC的排放量急剧上升。随着EGR率的增加，四种燃料的颗粒物数量浓度先下降后上升，颗粒物质量浓度先保持稳定后急剧上升。随着BD 20中PODE 3 -4添加比例的增加，颗粒几何平均直径进一步减小。
An experimental investigation is conducted on the influence of EGR (Exhaust Gas Recirculation) rates (0-40%) on the combustion and emission characteristics of n-butanol/diesel/PODE3-4 blends at low-temperature combustion mode in diesel engine. The results show that at identical EGR rate, compared to D100 (diesel fuel), the peak values both of the mean cylinder pressure and the heat release rate of BD20 (20% butanol and 80% diesel in volume) are increased, ignition delay is extended, and the brake thermal efficiency is enhanced. Concerning BD20 blended with PODE3-4, the ignition delay is shortened, while both the brake thermal efficiency and the combustion efficiency increase. At the EGR rate below 30%, as the EGR rate grows, the effects on emission of soot, CO and HC are not significant, while the emission of NOx is sharply reduced; when the EGR rate is above 30%, as it grows, the emissions of soot, CO, and HC drastically rise. As EGR rate grows, the total particulate matter (PM) number concentrations of four fuels firstly decline and then rise, the total PM mass concentrations keep stable firstly and then rise drastically. As the proportion of added PODE3-4 in BD20 grows, the particle geometric mean diameters further decrease.