Ethylene is a fuel considered for high-speed ram- and scramjet combustion applications, mainly because of the short ignition delay time resulting from its high reactivity. Further research and development on these combustion systems would benefit from simulations of large eddy (LES) type, which allow some chemical detail to accurately predict combustion characteristics and pollutant formation. In the present work, a chemical kinetic mechanism suitable for LES is presented, consisting of 66 irreversible reactions between 23 species. The mechanism is extensively validated for combustion characteristics related to ignition and flame propagation over a wide range of pressure, temperature, and equivalence ratios that previously published mechanism of this size have not covered. Agreement with a detailed reference mechanism is good for ignition delay, flame temperature, and laminar burning velocities. In addition, overall concentration profiles of major stable products are in overall good agreement with a reference mechanism. The skeletal mechanism shows an overall good performance in combination with a numerical stability and short computation time, making it highly suitable for combustion LES.

中文翻译：

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乙烯-空气燃烧的小骨架动力学反应机理

乙烯是高速冲压冲压发动机和超燃冲压发动机燃烧应用中考虑的燃料，主要是由于其高反应活性导致点火延迟时间短。这些燃烧系统的进一步研究和开发将受益于大涡（LES）类型的模拟，该模拟允许一些化学细节来准确预测燃烧特性和污染物形成。在目前的工作中，提出了一种适用于LES的化学动力学机制，该机制由23个物种之间的66个不可逆反应组成。该机构针对与点火和火焰在较大压力，温度和当量比范围内的传播有关的燃烧特性进行了广泛验证，而以前公布的这种尺寸的机构尚未涵盖该特性。与详细的参考机制达成协议有利于点火延迟，火焰温度和层流燃烧速度。此外，主要稳定产品的总体浓度分布与参考机制总体上良好吻合。骨架机制显示出整体良好的性能，并具有数值稳定性和较短的计算时间，使其非常适合燃烧LES。