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Physics of Flame Blowoff Limit Behavior in Bluff-Body Stabilized Premixed Turbulent Combustion
Education - Lecture/Discussion - WPI Only
Wednesday, November 11, 2009
2:00 PM-3:00 PM
Higgins Laboratories
HL218
Professor Baki Cetegen
University of Connecticut
Abstract : Stability characteristics (blowoff, flashback and flame response to flow oscillations) are important considerations in the design and operation of highly energetic combustion devices such as gas turbine combustors, afterburners, furnaces and rockets. Of particular interest is the flame behavior under fuel lean combustion conditions since many pollution reduction schemes are based on fuel lean combustion. Under such conditions, flames are susceptible to external perturbations and they can detach from flame holders and blow off. In this presentation, a detailed experimental study of bluff-body stabilized premixed flames is described in three parts. In the first part, the flame blowoff conditions are characterized and the physical reasons for the flame blowoff are elucidated using particle image velocimetry (PIV) and OH-planar laser induced fluorescence (PLIF) data. In the second part, results from experiments with imposed fuel-air mixture gradients upstream of the flame holder are described in terms of its blowoff behavior and response function to imposed flow oscillations. Finally, utility of CH* chemiluminescence signal from the flame stabilization zone as a flame blowoff precursor is discussed.
Suggested Audiences:
College
E-mail:
mdemetri@wpi.edu
Phone: 508-831-5459
Last Modified: October 13, 2009 at 9:50 AM
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Physics of Flame Blowoff Limit Behavior in Bluff-Body Stabilized Premixed Turbulent Combustion
Education - Lecture/Discussion - WPI Only
Wednesday, November 11, 2009
2:00 PM-3:00 PM
Higgins Laboratories
HL218
Professor Baki Cetegen
University of Connecticut
Abstract : Stability characteristics (blowoff, flashback and flame response to flow oscillations) are important considerations in the design and operation of highly energetic combustion devices such as gas turbine combustors, afterburners, furnaces and rockets. Of particular interest is the flame behavior under fuel lean combustion conditions since many pollution reduction schemes are based on fuel lean combustion. Under such conditions, flames are susceptible to external perturbations and they can detach from flame holders and blow off. In this presentation, a detailed experimental study of bluff-body stabilized premixed flames is described in three parts. In the first part, the flame blowoff conditions are characterized and the physical reasons for the flame blowoff are elucidated using particle image velocimetry (PIV) and OH-planar laser induced fluorescence (PLIF) data. In the second part, results from experiments with imposed fuel-air mixture gradients upstream of the flame holder are described in terms of its blowoff behavior and response function to imposed flow oscillations. Finally, utility of CH* chemiluminescence signal from the flame stabilization zone as a flame blowoff precursor is discussed.
Suggested Audiences: College
E-mail: mdemetri@wpi.edu
Phone: 508-831-5459
Last Modified: October 13, 2009 at 9:50 AM
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