Thermoacoustic transfer functions of a full-scale gas turbine burner operating under full engine pressure have been measured. The excitation of the high-pressure test facility was done using a siren that modulated a part of the combustion airflow. Pulsation probes have been used to record the acoustic response of the system to this excitation. In addition, the flame’s luminescence response was measured by multiple photomultiplier probes and a light spectrometer. Three techniques to obtain the thermoacoustic transfer function are proposed and employed: two acoustic-optical techniques and a purely acoustic technique. The first acoustical-optical technique uses one single optical signal capturing the chemiluminescence intensity of the flame as a measure for the heat release in the flame. This technique only works if heat release fluctuations in the flame have only one generic source, e.g., equivalence ratio or mass flow fluctuations. The second acoustic-optical technique makes use of the different response of the flame’s luminescence at different optical wavelengths bands to acoustic excitation. It also works, if the heat release fluctuations have two contributions, e.g., equivalence ratio and mass flow fluctuation. For the purely acoustic technique, a new method was developed in order to obtain the flame transfer function, burner transfer function, and flame source term from only three pressure transducer signals. The purely acoustic method could be validated by the results obtained from the acoustic-optical techniques. The acoustic and acoustic-optical methods have been compared and a discussion on the benefits and limitations of each is given. The measured transfer functions have been implemented into a nonlinear, three-dimensional, time domain network model of a gas turbine with an annular combustion chamber. The predicted pulsation behavior shows a good agreement with pulsation measurements on a field gas turbine.
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e-mail: daniel.guyot@tu-berlin.de
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November 2010
Research Papers
Thermoacoustic Modeling of a Gas Turbine Using Transfer Functions Measured Under Full Engine Pressure
Felix Guethe,
Felix Guethe
Alstom (Switzerland) Ltd.
, CH-5405 Baden, Switzerland
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Douglas Pennell,
Douglas Pennell
Alstom (Switzerland) Ltd.
, CH-5405 Baden, Switzerland
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Daniel Guyot,
Daniel Guyot
Hermann-Föttinger-Institute,
e-mail: daniel.guyot@tu-berlin.de
Technische Universität Berlin
, 10623 Berlin, Germany
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Christian Oliver Paschereit
Christian Oliver Paschereit
Chair of Fluid Dynamics
Hermann-Föttinger-Institute,
Technische Universität Berlin
, 10623 Berlin, Germany
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Bruno Schuermans
Felix Guethe
Alstom (Switzerland) Ltd.
, CH-5405 Baden, Switzerland
Douglas Pennell
Alstom (Switzerland) Ltd.
, CH-5405 Baden, Switzerland
Daniel Guyot
Hermann-Föttinger-Institute,
Technische Universität Berlin
, 10623 Berlin, Germanye-mail: daniel.guyot@tu-berlin.de
Christian Oliver Paschereit
Chair of Fluid Dynamics
Hermann-Föttinger-Institute,
Technische Universität Berlin
, 10623 Berlin, GermanyJ. Eng. Gas Turbines Power. Nov 2010, 132(11): 111503 (9 pages)
Published Online: August 10, 2010
Article history
Received:
May 6, 2009
Revised:
May 7, 2009
Online:
August 10, 2010
Published:
August 10, 2010
Citation
Schuermans, B., Guethe, F., Pennell, D., Guyot, D., and Paschereit, C. O. (August 10, 2010). "Thermoacoustic Modeling of a Gas Turbine Using Transfer Functions Measured Under Full Engine Pressure." ASME. J. Eng. Gas Turbines Power. November 2010; 132(11): 111503. https://doi.org/10.1115/1.4000854
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