Simulation of side-wall quenching of laminar premixed flames with manifold-based reduced kinetic models implemented in generalised coordinates

Abstract

Side-wall quenching (SWQ) is one of the generic configurations for flame-wall interaction and has been widely investigated through simulations using detailed and reduced chemical kinetics. In all previous related studies using manifold-based reduced kinetic models, the reduced model equations are solved in thermokinetic coordinates. This study, by contrast, will for the first time conduct SWQ simulations based on reduced model equations in generalised coordinates. The implementation has been validated by comparison to both simulation results using detailed kinetics and experimental data. Comparing the results of computations solving reduced model equations in generalised coordinates to those in thermokinetic coordinates, it is found that there are only slight differences when the manifold is perfectly invariant, while large discrepancies appear if the manifold is not exactly invariant. Under the latter condition, only reduced model equations in generalised coordinates yield correct results. Within the combined framework of reduced model equations in generalised coordinates and the so-called reaction–diffusion manifold for tabulation, the sensitivity with respect to the gradient estimation is investigated to find out what degree of simplification is reasonable for SWQ simulations.