Vol. 1, No. 1, 2006

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ISSN: 2157-5452 (e-only)
ISSN: 1559-3940 (print)
Active control for statistically stationary turbulent premixed flame simulations

John B. Bell, Marcus S. Day, Joseph F. Grcar and Michael J. Lijewski

Vol. 1 (2006), No. 1, 29–51
Abstract

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.

Keywords
active control, statistically stationary, turbulent flames
Mathematical Subject Classification 2000
Primary: 80A25, 93C20, 65M06, 65M50
Milestones
Received: 30 August 2005
Revised: 10 November 2005
Accepted: 11 November 2005
Published: 8 May 2007
Authors
John B. Bell
Lawrence Berkeley National Laboratory
Mail Stop 50A-1148
1 Cyclotron Road
Berkeley, CA 94720-8142
United States
Marcus S. Day
Lawrence Berkeley National Laboratory
Mail Stop 50A-1148
1 Cyclotron Road
Berkeley, CA 94720-8142
United States
http://seesar.lbl.gov/ccse/people/marc/index.html
Joseph F. Grcar
Lawrence Berkeley National Laboratory
Mail Stop 50A-1148
1 Cyclotron Road
Berkeley, CA 94720-8142
United States
http://seesar.lbl.gov/ccse/people/grcar/index.html
Michael J. Lijewski
Lawrence Berkeley National Laboratory
Mail Stop 50A-1148
1 Cyclotron Road
Berkeley, CA 94720-8142
United States
http://seesar.lbl.gov/ccse/people/lijewski/index.html