Effect of reactive intermediates on the propagation of turbulent premixed flames
The most simple version of the Bray and Libby model of turbulent flame propagation has been extended to include a two-step reaction mechanism in which reactants decompose into reactive intermediates which then form products. A transport equation for the joint pdf of intermediate and product concentrations was derived, the pdf parameterized, and transport equations for the parameters obtained. The one-dimensional concentration equations were then solved for the parameters of the pdf and the turbulent kinetic energy. Flame speed and angle are recovered as eigenvalues of the problem. The results show the essential features observed in experiments. The product pdf is composed of peaks at zero and unity product concentration, with a continuous structure representing partially reacted gas. The intermediates pdf has a peak at zero concentration and a broad bell-shaped distribution at nonzero concentration, representing partially reacted gas. The results also show the effect of partitioning of energy release on the flame thickness and speed. 29 references.
- Research Organization:
- California Institute of Technology, Pasadena; California Univ., Berkeley
- OSTI ID:
- 5880981
- Journal Information:
- AIAA J.; (United States), Journal Name: AIAA J.; (United States) Vol. 23; ISSN AIAJA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALKANES
EARTH ATMOSPHERE
ENERGY
FLAME PROPAGATION
FLUID FLOW
HYDROCARBONS
INTERACTIONS
KINETIC ENERGY
KINETICS
METHANE
ORGANIC COMPOUNDS
RADIATIONS
REACTION KINETICS
SOLAR ACTIVITY
SOLAR RADIATION
SOLAR WIND
STELLAR RADIATION
TRANSPORT THEORY
TURBULENT FLOW