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Combustion Instability in a Swirl Flow Combustor With Transverse Extensions

[+] Author Affiliations
Aditya Saurabh, C. O. Paschereit

Technische Universität Berlin, Berlin, Germany

Paper No. GT2013-95732, pp. V01BT04A057; 10 pages
doi:10.1115/GT2013-95732
From:
  • ASME Turbo Expo 2013: Turbine Technical Conference and Exposition
  • Volume 1B: Combustion, Fuels and Emissions
  • San Antonio, Texas, USA, June 3–7, 2013
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5511-9
  • Copyright © 2013 by ASME

abstract

The present investigation is an analysis of self-excited combustion instability in a swirl flame-based combustor with transverse extensions. Transverse extensions create the possibility of studying flame interaction with transverse acoustic oscillations. Such investigation important for understanding the phenomenon of thermoacoustic instability in annular combustors, where during thermoacoustic instability, azimuthal acoustic modes of the combustor couple with the multiple flames of the combustor. Flame and flow field dynamics during self-excited thermoacoustic instability in the single burner test-rig is presented here. These results are then compared to the dynamics of the isothermal and reacting flows in response to axial and transverse acoustic forcing. Both axial and transverse forcing led to the formation of axisymmetric shear layer vortices. Adding to the insight gained from previous investigations, these results suggest that that swirl flow dynamics in response to transverse acoustics consists of a non-trivial, direct effect of transverse acoustics on the flow field, in addition to its response to longitudinal fluctuations induced by transverse forcing.

Copyright © 2013 by ASME

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