Abstract
A method for automatic reduction of reaction mechanisms has been developed and applied to a homogeneous model of a staged combustor simulation using a sequence of a PSR (Perfectly Stirred Reactor) and a PFR (Plug Flow Reactor) fuelled with ethylene (C2H4) doped with monomethylamine (CH3NH2) as a model compound for fuel bound nitrogen. A measure of species' lifetimes combined with the species' sensitivity is called the Level of Importance (LOI) and species with a LOI lower than a specified limit are selected as steady states. The original mechanism is reduced to a minimum of 22 species. It is found that the error in NO mole fractions relative to the detailed case amounts to single percentage units up to a lifetime limit of 10 μs (38 remaining species), and for the maximum achievable degree of reduction (22 remaining species), 3.9% in the PSR and 4.0% after the PFR.
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