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Dynamics and Stability Limits of Syngas Combustion in a Swirl-Stabilized Combustor

[+] Author Affiliations
Raymond L. Speth, H. Murat Altay, Duane E. Hudgins, Ahmed F. Ghoniem

Massachusetts Institute of Technology, Cambridge, MA

Paper No. GT2008-51023, pp. 767-776; 10 pages
doi:10.1115/GT2008-51023
From:
  • ASME Turbo Expo 2008: Power for Land, Sea, and Air
  • Volume 3: Combustion, Fuels and Emissions, Parts A and B
  • Berlin, Germany, June 9–13, 2008
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4313-0 | eISBN: 0-7918-3824-2
  • Copyright © 2008 by Massachusetts Institute of Technology

abstract

The combustion dynamics, stability bands and flame structure of syngas flames under different operating conditions are investigated in an atmospheric pressure swirl-stabilized combustor. Pressure measurements and high-speed video data are used to distinguish several operating modes. Increasing the equivalence ratio makes the flame more compact, and in general increases the overall sound pressure level. Very close to the lean blowout limit, a long stable flame anchored to the inner recirculation zone is observed. At higher equivalence ratios, a low frequency, low amplitude pulsing mode associated with the fluid dynamic instabilities of axial swirling flows is present. Further increasing the equivalence ratio produces unstable flames oscillating at frequencies coupled with the acoustic eigenmodes. Additionally, a second unstable mode, coupled with a lower eigen-mode of the system, is observed for flames with CO concentration higher than 50%. As the amount of hydrogen in the fuel is increased, the lean flammability limit is extended and transitions between operating regimes move to lower equivalence ratios.

Copyright © 2008 by Massachusetts Institute of Technology

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