Application of a Flame Dictionary Method in Turbulent Premixed Flame Modeling. Construction of a Flame Dictionary

|The construction of a ame dictionary of ame speeds and preheat thicknesses for a given reaction will be discussed. Once the entries of the dictionary have been established, they can be accessed by researchers and programmers to be used in diierent combustion applications. An application of the ame dictionary for turbulent combustion in a circular cylinder is given. Chemical reactions are often expressed in terms of a single global equation. For example, a methane and oxygen reaction may be written in the following way: In reality, this is only a model equation. Many basic elementary reactions and many chemical species are involved in the process. To accurately compute the combustion properties of such a complicated system, one needs a grid that can accurately represent the variation in temperature and species in the computational domain. This becomes prohibitively expensive. In this paper, we treat the combustion process as a small entity in a vast nonreacting ow eld. For a given chemical reaction, a ame dictionary is constructed in advance. This ame dictionary contains ame speeds and preheat thicknesses. These two pieces of information describe the combustion process's steady-state physical and chemical structure. The ame dictionary provides the link between the large scale hydrodynamics calculations and the small scale chemical reaction. Each entry in the dictionary is the result of a one-dimensional calculation on a very ne grid. One may encounter diiculties when solving the one-dimensional problems, but once the ame dictionary is constructed for a given set of reactions, only its entries will be referred to; the