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在正庚烷以及葵酸甲酯混合物详细机理的基础上,提出了一个适用于均质压燃发动机的生物柴油简化机理模型。该模型包含113种物质以及306个反应,通过路径分析以及温度敏感性分析方法得到。采用实验所得的燃料着火延迟时间、发动机缸内压力以及CO的排放来验证该简化机理的有效性。结果显示简化机理模型同正庚烷以及葵酸甲酯的着火延迟时间保持一致,并且能有效模拟缸内的压力变化过程以及CO的排放。为了进一步验证简化机理的有效性,将简化机理计算结果同详细机理进行对比。结果显示简化机理的缸内压力、缸内温度以及主要物质的变化趋势同详细机理保持一致。因此,简化机理是合理的。
Based on the detailed mechanism of n-heptane and methylnaphthalate mixture, a simplified mechanism model of biodiesel suitable for homogeneous compression ignition engine is proposed. The model contains 113 substances and 306 reactions, which are obtained by path analysis and temperature sensitivity analysis. The experimentally obtained fuel ignition delay time, engine cylinder pressure, and CO emissions were used to verify the effectiveness of the simplified mechanism. The results show that the simplified mechanism model is consistent with the ignition delay time of n-heptane and methyl n-octyl sulfate, and can effectively simulate the pressure changes in the cylinder and CO emissions. In order to further verify the effectiveness of the simplified mechanism, the simplified mechanism calculation results are compared with the detailed mechanism. The results show that the simplified mechanism of in-cylinder pressure, cylinder temperature and the trend of the main substances are consistent with the detailed mechanism. Therefore, simplifying the mechanism is reasonable.