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Experimental and LES Analysis of a Premix Swirl Burner Under Acoustic Excitation

[+] Author Affiliations
F. Biagioli, S. Wysocki, R. Alemela

GE (Switzerland) GmbH, Baden, Switzerland

S. Srinivasan

GE Power, Greenville, SC

A. Denisov

Hochschule für Technik FHNW, Windisch, Switzerland

Paper No. GT2017-64518, pp. V04BT04A025; 11 pages
doi:10.1115/GT2017-64518
From:
  • ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition
  • Volume 4B: Combustion, Fuels and Emissions
  • Charlotte, North Carolina, USA, June 26–30, 2017
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5085-5
  • Copyright © 2017 by ASME

abstract

The frequency response to acoustic excitation of turbulent premixed flames stabilized in a high swirl flow is investigated with high speed diagnostics and Large Eddy Simulation (LES). In both cases, the flame transfer function (FTF), i.e. the frequency response of the total heat release, is also determined. Both experiments and LES show distributions of the FTF amplitude and phase which are different from flames stabilized in non swirling flows, for example piloted conical premixed flames. In order to shed light on these differences, the effect on the FTF of the swirl velocity fluctuation driven by a forced harmonic perturbation in the reactant flow rate is isolated in the LES simulations using a novel methodology that makes use of the Proper Orthogonal Decomposition (POD). The typical FTF distributions observed in experiments for swirl stabilized flames are interpreted on the basis of this separation. A close link with the frequency response of the velocity field distribution in the combustor is also established.

Copyright © 2017 by ASME
Topics: Acoustics , Excitation

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