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Laser Vibrometry for Real-Time Combustion Stability Diagnostic

[+] Author Affiliations
Fabrice Giuliani, Bernhard Wagner, Jakob Woisetschläger, Franz Heitmeir

Graz University of Technology, Graz, Austria

Paper No. GT2006-90413, pp. 603-610; 8 pages
doi:10.1115/GT2006-90413
From:
  • ASME Turbo Expo 2006: Power for Land, Sea, and Air
  • Volume 2: Aircraft Engine; Ceramics; Coal, Biomass and Alternative Fuels; Controls, Diagnostics and Instrumentation; Environmental and Regulatory Affairs
  • Barcelona, Spain, May 8–11, 2006
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4237-1 | eISBN: 0-7918-3774-2
  • Copyright © 2006 by ASME

abstract

Laser-based diagnostics for combustion monitoring are promising sensing techniques for the upcoming generation of build-in gas turbines measurement and control devices. Their principles are usually based on direct measurement of line-of-sight transmission, absorption, scattering or re-emission of laser light through the flame. We discuss here how a similar method based this time on interferometry can provide a refined analysis on dynamics of injected reactants and flame stability. Measurements are performed on a resonant premixed air/methane flame using Laser Vibrometry (LV). A method for detection of combustion instability within the primary zone is described, and dual LV measurements performed over the full flame cross section provide a refined analysis of the flow patterns. This technique, originally dedicated to structural dynamics, shows a high potential for low-cost and rapid flow characterisation during the benchmark tests of a gas turbine combustor. The discussion ends on feasibility for embarking Laser Vibrometry as a real-time combustion monitor.

Copyright © 2006 by ASME

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