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Thermo-Acoustic Interactions in a Premixed Dump Combuster

[+] Author Affiliations
S. Galvin, J. A. Fitzpatrick

Trinity College, Dublin, Ireland

Paper No. IMECE2002-33358, pp. 829-836; 8 pages
doi:10.1115/IMECE2002-33358
From:
  • ASME 2002 International Mechanical Engineering Congress and Exposition
  • 5th International Symposium on Fluid Structure Interaction, Aeroelasticity, and Flow Induced Vibration and Noise
  • New Orleans, Louisiana, USA, November 17–22, 2002
  • Conference Sponsors: Applied Mechanics Division
  • ISBN: 0-7918-3659-2 | eISBN: 0-7918-1691-5, 0-7918-1692-3, 0-7918-1693-1
  • Copyright © 2002 by ASME

abstract

There is significant interest in the interaction of parameters associated with lean premixed combustion because the demand for reduced emissions has led to an increased usage of this type of system. Thermoacoustic instabilities, which arise as a consequence of unsteady pressure and heat release interactions, are known to occur frequently for these lean premixed configurations. There has been a substantial research effort in the past decade directed at the development of modelling techniques for the prediction and control of these instabilities. Tests have been performed in an optically accessible dump combustor for a range of equivalence ratio with two different dump or expansion ratios and a number of flow rates. Both thermoacoustic and flow/acoustic interactions are observed over a large operating range. The pressure and heat release autospectra and cross-spectra were calculated and their coherence and phase relationships are examined to determine their interaction including the applicability of the Rayleigh criterion.

Copyright © 2002 by ASME
Topics: Acoustics

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