Active control for statistically stationary turbulent premixed flame simulations
| Autor: | John B. Bell, Joseph F. Grcar, Day, M.J. Lijewski |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Surface (mathematics)
Engineering active control Mechanical engineering 65M06 Combustion Curvature Physics::Fluid Dynamics Flashback 93C20 medicine Physics::Chemical Physics 65M50 Premixed flame business.industry Turbulence Applied Mathematics Mechanics turbulent flames Active control Computer Science Applications Computational Theory and Mathematics 80A25 statistically stationary medicine.symptom business Intensity (heat transfer) |
| Zdroj: | Commun. Appl. Math. Comput. Sci. 1, no. 1 (2006), 29-51 |
| ISSN: | 2157-5452 1559-3940 |
| DOI: | 10.2140/camcos.2006.1.29 |
| Popis: | The speed of propagation of a premixed turbulent flame correlates with the intensity of the turbulence encountered by the flame. One consequence of this property is that premixed flames in both laboratory experiments and practical combustors require some type of stabilization mechanism to prevent blow-off and flashback. The stabilization devices often introduce a level of geometric complexity that is prohibitive for detailed computational studies of turbulent flame dynamics. Furthermore, the stabilization introduces additional fluid mechanical complexity into the overall combustion process that can complicate the analysis of fundamental flame properties. To circumvent these difficulties we introduce a simple, heuristic feedback control algorithm that allows us to computationally stabilize a turbulent premixed flame in a simple geometric configuration. For the simulations, we specify turbulent inflow conditions and dynamically adjust the integrated fueling rate to control the mean location of the flame in the domain. We outline the numerical procedure, and illustrate the behavior of the control algorithm on methane flames at various equivalence ratios in two dimensions. The simulation data are used to study the local variation in the speed of propagation due to flame surface curvature. |
| Databáze: | OpenAIRE |
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