Effects of Soret diffusion on spherical flame initiation and propagation

摘要: Abstract Dynamics of spherical flame initiation and propagation with Soret diffusion are investigated using large-activation-energy asymptotic analysis. Under the assumptions constant density quasi-steady propagation, a general correlation between propagating speed radius considering external energy deposition is derived. Emphasis placed on assessing effects speed, Markstein length, critical ignition condition. The stretched found to be increased reduced by light heavy fuels, respectively. For both absolute value length increases after including diffusion, indicating that premixed flames become more sensitive stretch rate diffusion. It can characterized an effective Lewis number which includes Moreover, shown affect process since kernel highly stretched. large hydrocarbon fuels high numbers, minimum power becomes much larger