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Large Eddy Simulation of a Thermoacoustic Instability Within a Swirl-Stabilized Burner Using Impedance Boundary Conditions

[+] Author Affiliations
Jean-Michel Lourier, Berthold Noll, Manfred Aigner

German Aerospace Center (DLR), Stuttgart, Germany

Paper No. GT2014-26200, pp. V04BT04A021; 12 pages
doi:10.1115/GT2014-26200
From:
  • ASME Turbo Expo 2014: Turbine Technical Conference and Exposition
  • Volume 4B: Combustion, Fuels and Emissions
  • Düsseldorf, Germany, June 16–20, 2014
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4569-1
  • Copyright © 2014 by ASME

abstract

A thermoacoustic instability observed within a lean swirl-stabilized burner is analyzed by means of numerical calculations. As extension to previously reported numerical data for the considered test case, the numerical domain is extended to include the fuel plenum and the acoustic outlet impedance is modeled by time domain impedance boundary conditions.

The predicted thermoacoustic frequency is in excellent agreement with experimental findings. Furthermore, the thermoacoustic feedback loop is discussed by means of phase resolved data which show that a variation of the equivalence ratio within the swirler is the driving mechanism of the instability. Finally, the Rayleigh criterion is shown to be satisfied within the combustion chamber. Hence, a closed thermoacoustic feedback loop is observed.

Copyright © 2014 by ASME

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