为探索掺混生物柴油燃烧耦合进气道加湿技术及喷油提前角优化对柴油机燃烧及排放性能的影响，基于TBD234V6型柴油机，应用AVL-fire软件建立仿真模型进行研究。选取柴油机在75%中高负荷工作时，生物柴油掺混比为40%通过设置0.5～2.5共5组不同水油比做仿真分析。结果表明：在生物柴油掺混比为40%（B40）时，随水油比增加柴油机动力性下降3.3%，CO排放量升高19.2%，NOX排放量降低89.7%，SOOT排放量升高150.8%，但与原机相比SOOT排放量仍低出81.9%；掺混生物柴油降低Soot及CO排放效果显著，但对NO排放有促进作用；生物柴油耦合进气道加湿技术能极大降低NO排放，同时对Soot和CO生成也有较好的抑制效果，但柴油机动力性降低了。通过对喷油提前角优化，增大喷油提前角有助于提高发动机动力性，生物柴油掺混比40（B40）水油比为2.5喷油提前角由25℃A改为31℃A时，其动力性上升13.1%，NO排放低于原机，整体排放依旧更优。该研究结果可为生物柴油实际应用产生的负面影响提供解决方案。
In order to explore the influence of the humidification technology of the coupled inlet with biodiesel combustion and the optimization of fuel injection advance angle on the combustion and emission performance of diesel engines. Based on TBD234V6 diesel engine, avL-Fire software was used to build the simulation model.When the diesel engine is selected to work at 75% medium and high load, the mixture ratio of biodiesel is set to 40%.5 groups of different water-oil ratios are set at 0.5~2.5 for simulation analysis.The results show that, when the mixing ratio of biodiesel is 40% (B40), its power property decreases by 3.3% with the increase of water-oil ratio, CO emission rises 19.2%, NOX emission decreases 89.7%, SOOT emission increases 150.8%, and same time, it is still 81.9% lower than the original engine.Mixing biodiesel has significant effect on reducing Soot and CO emission, but it can promote NO emission.Moistening technology of biodiesel coupled inlet can decrease NO emission greatly, and it also has good inhibiting effect on Soot and CO generation, but its power performance is decreased.By optimizing the fuel injection advance Angle, increasing the fuel injection advance Angle is helpful to improve the engine power performance.When the fuel injection advance Angle is changed from 25℃A to 31℃A, the power performance of biodiesel is increased by 13.1%. NO emission is lower than that of the original engine, and the overall emission is still better.The results of this study can provide a solution for the negative effects of the practical application of biodiesel.
2022,44(5): 88-92 收稿日期：2020-11-04
DOI：10.3404/j.issn.1672-7649.2022.05.017
分类号：U664.121;TK421+.26
基金项目：福建省自然科学基金资助项目（2019J01705，2018J01491，2018J01499）
作者简介：王彬彬(1997-)，男，硕士研究生，从事热能动力装置节能与减排技术
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