Effects of non-equidiffusion on unsteady propagation of hydrogen-enriched methane/air premixed flames
作者： V. Di Sarli , A. Di Benedetto
DOI: 10.1016/J.IJHYDENE.2013.03.126
关键词: Mechanics 、 Diffusion (business) 、 Premixed flame 、 Large eddy simulation 、 Analytical chemistry 、 Lewis number 、 Hydrogen 、 Vortex ring 、 Diffusion flame 、 Chemistry 、 Vortex
摘要: Abstract A Large Eddy Simulation (LES) model was developed to simulate the unsteady propagation of hydrogen-enriched methane/air premixed flames around toroidal vortices. Although LES does not take into account non-equidiffusive effects associated with hydrogen presence (preferential diffusion and non-unity Lewis number), it gives good predictions experimental data previously obtained for lean mixtures mole fraction in fuel (hydrogen plus methane) varying from 0 0.5. In particular, each composition, size velocity vortex generated ahead propagating flame front are well reproduced along evolution shape structure resulting interaction vortex. The negligible role played by has been attributed fact that, at conditions investigated, characteristic time is one order magnitude higher than roll-up
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