Modified diffusion model adapted to non-unity Lewis number mixtures for low flame stretch using the thickened flame model

Sandy Poncet (1, 2) , Cedric Mehl (2, 1) , Karine Truffin (2, 1) , Olivier Colin (2, 1)

1 Institut Carnot IFPEN Transports Energie
2 IFPEN - IFP Energies nouvelles

This study proposes a methodology based on species diffusion adaptation to recover flame response to stretch in the context of the Thickened Flame Model for non-unity Lewis mixtures. First, the flame speed variation induced by low stretch, that is overestimated by the standard form of the TFM, is illustrated with stoichiometric C 8 H 18 /air (Le > 1) and lean H 2 /air (Le < 1) stretched thickened flame fronts. Secondly, the model correction parameter is deduced from spherical flame simulations for both mixture conditions. A posteriori validations, performed on spherical flames and flame-vortex interaction configurations, finally illustrate the effectiveness of this method.

Mots clés: Stretch; Diffusion; Non-unity Lewis number; Laminar premixed flame; Thickened Flame Model

Domaines: Mathématiques [math]

Sandy Poncet, Cedric Mehl, Karine Truffin, Olivier Colin. Modified diffusion model adapted to non-unity Lewis number mixtures for low flame stretch using the thickened flame model. 11th European Combustion Meeting - ECM 2023, Combustion Institute - French Section, Apr 2023, Rouen, France. ⟨hal-04112105⟩