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为了更好地理解低温燃烧环境下初始NOx对汽油自燃特性的影响,构建了一个异辛烷、正庚烷、甲苯低温氧化阶段与NOx相关联的反应模型.以甲烷、丁烷、乙烯等燃料与NOx的关联反应为基础,甄选并补充了汽油大分子替代燃料对应初始烃类物质与含氮组分反应以及低温阶段氮氧化物的生成与转化反应.与三种不同成分及配比结构的燃料实验数据对比,验证了此反应模型能用于预测NOx对相应燃料着火延迟及放热规律的影响,并对燃料在不同掺混比例时初始NOx的添加情况进行了分析,获得了初始NOx对不同燃料成分的主要作用途径.结果表明:系统燃烧相位会随初始NOx添加而提前,当燃料中以甲苯为主要成分时提前较多,而当主要成分为烷烃时,变动更为平缓.
In order to better understand the effect of initial NOx on the autoignition behavior of gasoline under low temperature combustion conditions, a reaction model associated with NOx during the low-temperature oxidation stage of isooctane, n-heptane and toluene was established. The methane, butane, ethylene and other fuels Based on the correlation reaction with NOx, selects and complements the reaction of initial hydrocarbon and nitrogen-containing components of petrol macromolecule alternative fuels and the formation and transformation of nitrogen oxides in the low temperature stage.With the three different components and the ratio structure The experimental data verify that the reaction model can be used to predict the effects of NOx on the ignition delay and the heat release of the corresponding fuel. The initial NOx addition is also analyzed when the fuel is added at different mixing ratios. The results show that: the combustion phase of the system will be advanced with the initial NOx addition, while toluene will be the main component of the fuel, the change will be more moderate when the main components are alkanes.