Analyzing the Effect of Free Stream Turbulence on Gaseous Non-Premixed Flames

The effects of free stream turbulence on non-premixed flames are numerically analyzed. The Spalding eddy dissipation mathematical model is used to control the reaction rate by the large-eddy time scale. The turbulence energy production and dissipation rates are simulated by the k- epsilon turbulence...

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Bibliographic Details
Published in:Proceedings of the 10th International Conference 2009-10, Vol.1225, p.891-900
Main Authors: Saqr, Khalid M, Sies, Mohsin M, Wahid, Mazlan A
Format: Article
Language:English
Subjects:
Axisymmetric
Combustion
Computational fluid dynamics
Computer simulation
Dissipation
Eddies
Extinction
Flame propagation
Fluid flow
Mathematical analysis
Mathematical models
Streams
Turbulence
Turbulence intensity
Turbulence models
Turbulent flow
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Summary:The effects of free stream turbulence on non-premixed flames are numerically analyzed. The Spalding eddy dissipation mathematical model is used to control the reaction rate by the large-eddy time scale. The turbulence energy production and dissipation rates are simulated by the k- epsilon turbulence model in order to investigate the dependence of the combustion properties on free stream turbulence. The reacting NS equations were spatially discretized and solved through a finite volume scheme and a decoupled pressure-velocity approach, respectively. The flame was assumed to be steady-state, two dimensional and axisymmetric. The reported results include the velocity, temperature and turbulent reaction rate along the flame propagation field It is found that the increase of free stream turbulence intensity reduces the reaction zone significantly, hence, induces the flame extinction process.
ISSN:0094-243X