Swirling flows are widely used in industrial burners and gas turbine combustors for flame stabilization. Several prior studies have shown that these flames exhibit complex dynamics under near blowoff conditions, associated with local flamelet extinction and alteration in the vortex breakdown flow structure. These extinction events are apparently due to the local strain rate irregularly oscillating above and below the extinction strain rate values near the attachment point. In this work, global temporally resolved and detailed spatial measurements were obtained of hydrogen/methane flames. Supporting calculations of extinction strain rates were also performed using detailed kinetics. It is shown that flames become unsteady (or local extinctions happen) at a nearly constant extinction strain rate for different hydrogen/methane mixtures. Based upon analysis of these results, it is suggested that classic Damköhler number correlations of blowoff are, in fact, correlations for the onset of local extinction events, not blowoff itself. Corresponding Mie scattering imaging of near blowoff flames also was used to characterize the spatio-temporal dynamics of holes along the flame that are associated with local extinction.
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November 2010
Research Papers
Dynamics of Premixed H2/CH4 Flames Under Near Blowoff Conditions
Qingguo Zhang,
Qingguo Zhang
School of Aerospace Engineering,
Georgia Institute of Technology
, Atlanta, GA 30332-0150
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Santosh J. Shanbhogue,
Santosh J. Shanbhogue
School of Aerospace Engineering,
Georgia Institute of Technology
, Atlanta, GA 30332-0150
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Tim Lieuwen
Tim Lieuwen
School of Aerospace Engineering,
Georgia Institute of Technology
, Atlanta, GA 30332-0150
Search for other works by this author on:
Qingguo Zhang
School of Aerospace Engineering,
Georgia Institute of Technology
, Atlanta, GA 30332-0150
Santosh J. Shanbhogue
School of Aerospace Engineering,
Georgia Institute of Technology
, Atlanta, GA 30332-0150
Tim Lieuwen
School of Aerospace Engineering,
Georgia Institute of Technology
, Atlanta, GA 30332-0150J. Eng. Gas Turbines Power. Nov 2010, 132(11): 111502 (8 pages)
Published Online: August 5, 2010
Article history
Received:
May 8, 2009
Revised:
September 3, 2009
Online:
August 5, 2010
Published:
August 5, 2010
Citation
Zhang, Q., Shanbhogue, S. J., and Lieuwen, T. (August 5, 2010). "Dynamics of Premixed H2/CH4 Flames Under Near Blowoff Conditions." ASME. J. Eng. Gas Turbines Power. November 2010; 132(11): 111502. https://doi.org/10.1115/1.4000601
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