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laminar diffusion flame

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Simulation numérique directe de flammes de diffusion laminaires en microgravité
H. Y. Wang, S. Rouvreau, P. Cordeiro, G. Legros, P. Joulain
Journal:

Mechanics & Industry / Volume 5 / Issue 5 / September 2004

Published online by Cambridge University Press:

19 November 2004, pp. 607-612

Print publication:

September 2004
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Une étude numérique est effectuée sur des brûleurs poreux qui simulent la combustion d'un combustible solide ou liquide. L'air et un mélange contenant 30 % d'O2 et 70 % N2 sont utilisés comme oxydant à des vitesses d'injection de 2,7 à 4 cm.s-1 correspondant aux systèmes de conditionnement d'air des vaisseaux spatiaux. Le système des équations de Navier-Stokes et des équations de conservation des espèces est résolu par la simulation numérique directe. L'approche numérique est centrée sur l'influence du champ gravitationnel sur la géométrie de la flamme, les limites d'extinction et le transfert de chaleur de la flamme vers la surface du brûleur. Les résultats du modèle indiquent que l'état stationnaire en phase gazeuse soit atteint au bout de 2,5 s, correspondant à l'observation expérimentale.