Intrinsic low-dimensional maniforlds of heterogeneous combustion processes

Abstract

The method of intrinsic low-dimensional manifolds (ILDMs) has been shown to be a useful tool to reduce detailed reaction mechanisms. Previous studies have been concentrated on the gas-phase kinetics. In this paper we show that this method can be applied to heterogeneous combustion processes, too. Calculations have been performed using a well-known surface reaction system (methane-air mixure on platinum) in a laminar stagnation configuration, including detailed surface and gas-phase reaction mechanisms and a detailed transport model. Using a local eigenvalue analysis of the surface chemistry, which follows the same ideas as for the gas phase, the relaxed modes of the surface kinetics and the local dimesion of the ILDMs for surface species can be determined. A mathematical model is presented which allows a combined use of gas-phase and surface ILDMs in heterogeneous reacting flow calculations.