A simplified mechanism of methyl decanoate and n-heptane blend was developed for a homogeneous charge compression ignition engine built from a previously reported detailed mechanism of a methyl decanoate and n-heptane.The simplified mechanism with 113 species and 306 reactions was developed using path flux and temperature sensitivity analyses.The simplified mechanism was validated against the experimental data of ignition delay time,in-cylinder pressure,and CO emissions.Results show that the simplified mechanism not only coincides with the ignition delay time of the methyl decanoate and n-heptane,but also the CO emissions,and can reproduce the variation of in-cylinder pressure.The simplified mechanism can be further validated by comparison with the detailed mechanism,which shows that the simplified mechanism can coincide with the in-cylinder pressure and temperature,and can reproduce the variation tendency of the core components.Thus,the reduced mechanism is a reasonable one.%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.
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