A manifold-based reduction method for side-wall quenching considering differential diffusion effects and its application to a laminar lean dimethyl ether flame

In the present study, reduced kinetics considering both differential diffusion effects and strong heat losses, based on the Reaction–Diffusion Manifold (REDIM) method, formulated and constructed in generalized coordi-nates, is proposed. The approach fully coupled to a CFD solver is applied to the side-wall quenching (SWQ) of a laminar premixed dimethyl ether–air flame at an equivalence ratio of 0.83 where differential diffusion effects are non-negligible and a detailed transport model is required. To the best of the authors’ knowledge, this is the first study to take into account differential diffusion effects in manifold-based reduced kinetic models for complex scenarios such as the SWQ process, while previous studies with reduced models simply adopted a unity Lewis number assumption. Additionally, this is the first combined experimental-numerical study, including simulations with manifold-based reduced models, for SWQ with differential diffusion.