二甲基醚均质压燃化学动力学简化模型的研究

由于详细的化学动力学模型与多维流动动力学模型耦合的高度复杂性，很难将其应用于模拟实际发动机的工作过程。在详细反应动力学研究基础上，通过对二甲基醚(DME)均质压燃燃烧反应途径和敏感性分析，建立了均质压燃二甲基醚的简化动力学模型。此模型在Curran et al模型基础上构建，包括26种产物和28个基元反应。结果表明，提出的二甲基醚简化动力学模型与详细动力学模型计算结果相当吻合，简化模型在对着火时刻、缸内温度和压力计算结果与详细模型基本一致，简化机理对变初始温度和混合气浓度也有较好的预测能力，可应用于模拟二甲基醚HCCI的燃烧过程。

Study on Reduced Chemical Kinetic Model for DME HCCI Combustion

The detailed chemical kinetic model has been used to predict the combustion characteristic, however, it is difficult to apply the detailed chemical kinetic model to simulate the engine working process due to the high complexity when coupled with multidimensional fluid dynamic model. A reduced model of dimethyl ether (DME) was developed based on the detailed kinetics model by analyzing in reaction paths of combustion of DME and sensitivity. The model consists of 28 reactions for 26 species simplified from the model of Curran et al (336 reactions, 78 species). The developed reduced model of DME showed good agreement with the detailed model in ignition timing, cylinder gas temperature and cylinder pressure. Moreover, the reduced model showed good predictability to the variation in initial gas temperature and mixture concentration, and can be used to simulate DME HCCI combustion.