An analysis of the partial-equilibrium assumption for bimolecular reactions in counter-flow diffusion flames

摘要

In the past decades, tremendous efforts have been made to study reaction mechanism in the hydrocarbon combustion system. Due to the complexity and difficulty of analyzing a flame system with detailed chemistry, a reduced model, which consists of only a portion of species and reactions in a full mechanism, is desired. Various model reduction methods have been applied to seek a balance between accuracy and efficiency. These include those based on the details of the chemistry [1, 2], iterative methods [3, 4] optimization methods [5] the method of intrinsic low-dimensional manifolds (ILDMs)[6] among others. Early attempts at mechanism reduction incorporated the steady-state approximation [7-9]for selected radical species and invoking the partial equilibrium approximation [1, 10], for a set or sets of elementary reactions. The result was a set of global reactions involving fewer non-radical species.