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Influence of Transversal Acoustic Excitation of the Burner Approach Flow on the Flame Structure

[+] Author Affiliations
Martin Hauser, Manuel Lorenz, Thomas Sattelmayer

Technische Universität München, Garching, Germany

Paper No. GT2010-22965, pp. 803-812; 10 pages
doi:10.1115/GT2010-22965
From:
  • ASME Turbo Expo 2010: Power for Land, Sea, and Air
  • Volume 2: Combustion, Fuels and Emissions, Parts A and B
  • Glasgow, UK, June 14–18, 2010
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4397-0 | eISBN: 978-0-7918-3872-3
  • Copyright © 2010 by ASME

abstract

Modern large gas turbines for power generation have multiple burners, which are distributed around the circumference of the engine and which generate flames in combustors of either annular or can-annular geometry. In both cases considering only the axial modes has proven to be insufficient for the assessment of the thermoacoustic stability. An adequate analysis requires consideration of the circumferential acoustic coupling, generated by the acoustic field in the upstream and downstream annuli and the open passages between the cans, respectively. As in annular combustors the particularly critical eigenmodes with low frequencies are predominantly of circumferential nature, the stability of annular combustors is often governed by the onset of circumferential acoustic oscillations. To determine the influence of these circumferential acoustic modes on the dynamic flame behavior, a new single burner test rig was developed. The unique acoustic properties of the test rig allow the exposure of a single swirl burner to a two-dimensional acoustic field that resembles the circumferential mode in an annular combustor. Measurements were performed for axial as well as transversal excitation of the burner and the combination of both. To investigate the dynamic flame structure phase-resolved flame images have been evaluated in terms of amplitude and phase distribution. Under transversal excitation the flame structure becomes highly asymmetrical. A region of higher OH*-intensity is generated in the combustion chamber which rotates with the excitation frequency. From phase-resolved PIV measurements of the isothermal flow it is concluded that the transversal excitation modulates the swirl generation leading to an asymmetrical velocity distribution in the burner nozzle and the combustion chamber, respectively.

Copyright © 2010 by ASME

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