Modeling HCCI combustion: Modification of a multi-zone model and comparison to experimental results at varying boost pressure
Modeling HCCI combustion: Modification of a multi-zone model and comparison to experimental results at varying boost pressure
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DOI：
10.1016/j.apenergy.2009.01.026
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发表时间：
2009-10
期刊：
影响因子：
11.2
通讯作者：
N. Komninos
中科院分区：
文献类型：
--
作者：
N. Komninos
本研究提出了一个比较的结果，从一个修改后的HCCI多区模型的实验测量，在不同的负载和增压压力条件下。多区域模型包括用于壁热传递的修改的子模型，并考虑区域之间的热传递。燃烧室的冷区域和热区域之间的气体混合对于排放物的形成是非常重要的，这也在整个压缩、燃烧和膨胀过程中被考虑。燃烧是使用一组减少化学反应与化学动力学求解器耦合建模。在燃烧室壁附近使用了一种精细的区域配置，以便在排放物形成区域获得高分辨率。九个实验案例的压力轨迹和排放量进行了比较，多区域模型的结果。在这些情况下，当量比和增压压力变化，同时保持恒定的发动机转速。结果表明，与压力迹线充分一致。排放趋势也得到了充分的捕捉，与绝对值呈现出一定的偏差，特别是在相对较低的空燃当量比的HC和CO排放的实验情况下。
The present study presents a comparison of the results obtained from a modified HCCI multi-zone model to experimental measurements, at different load and boost pressure conditions. The multi-zone model includes a modified sub-model for the wall heat transfer and accounts for the heat transfer between zones. Gas mixing between cold and hot regions of the combustion chamber, which is of major importance for the emissions formation, is also accounted for throughout compression, combustion and expansion. Combustion is modeled using a reduced set of chemical reactions coupled with a chemical kinetics solver. A refined zone configuration near the combustion chamber wall was used, in order to obtain a high resolution at the emissions formation regions. The pressure traces and emissions of nine experimental cases were compared to the multi-zone model results. In these cases the equivalence ratio and the boost pressure were varied, while maintaining constant engine speed. The results show adequate agreement with the pressure traces. The emissions trends are also adequately captured, with the absolute values presenting some deviation from the experimental cases especially for the HC and CO emissions at the relatively low air-fuel equivalence ratios.