The Dynamics of Premixed Flame Surfaces

提出的工作本质上是PI目前在火焰动力学领域进行的研究的延伸。所提出的努力的主要目标是重新检查，扩展和推广一个模型，该模型是PI在薄预混火焰状态下根据曲率，应变和非稳态效应开发的火焰速度依赖。具体的主题将包括以下方面的研究：(1)随时间变化的火焰结构，其中将考虑非定常扰动和大振幅解；(2)在接近化学计量混合物中的传播；(3)不均匀混合物对未燃烧气体的影响；(4)在密闭环境中预混火焰与表面相互作用的影响。一般方法将涉及使用基于一步全局动力学的大活化能渐近性，并允许从未燃烧气体到燃烧气体的密度变化。

Abstract Matalon CTS-9521022 The proposed work is essentially an extension of research currently being carried out by the PI in the area of flame dynamics. The primary objective of the proposed effort is to re-examine, extend and generalize a model that the PI has developed for the flame speed dependence in terms of curvature, strain and non-steady effects in the thin premixed flamelet regime. Specific topics will include the investigation of the following: (1) time dependent flame structure in which unsteady perturbation and large amplitude solutions will be considered, (2) propagation in near-stoichiometric mixtures, (3) effects of nonuniform mixtures on the unburned gas, and (4) effects of interactions of a premixed flame with surfaces and in confined environments. The general methodology will involve the use of large activation energy asymptotics based on one-step global kinetics, with the addition of allowing for density changes from unburned to burned gases.