Extension of the Reaction-Diffusion Manifold method to systems with ionization

Abstract

The Reaction-Diffusion Manifold (REDIM) method is a generic manifold based reduced kinetic model that has been applied to various combustion systems. In this work, it is extended and applied to combustion processes including charged species. In order to incorporate ions in the REDIM method, electrons and ions are accounted for in the coupling of kinetics and molecular transport. The REDIM method is extended to account for a very detailed transport model. This transport model can handle full detailed transport and accounts for ambipolar diffusion of the charged species. The suggested method is validated and demonstrated for laminar flat methane/air flames at different temperatures. A two-dimensional REDIM is generated, which can be used for premixed flames with different temperatures of the unburnt gas. The two-dimensional reduced kinetic model is validated by comparing the computational results of detailed and REDIM reduced kinetics. It is shown that the reduced scheme reproduces the results of detailed simulations very accurately, and that the REDIM concept can be extended to reaction systems with ionized species.