This paper deals with high-frequency thermoacoustic instabilities in swirl-stabilized gas turbine combustors. Driving mechanisms associated with periodic flame displacement and flame shape deformations are theoretically discussed, and corresponding flame transfer functions are derived from first principles. These linear feedback models are then evaluated by means of a lab-scale swirl-stabilized combustor in combination with part one of this joint publication. For this purpose, the models are used to thermoacoustically characterize a complete set of operation points of a this combustor facility. Specifically, growth rates of the first transversal modes are computed, and compared against experimentally obtained pressure amplitudes as an indicator for thermoacoustic stability. The characterization is based on a hybrid analysis approach relying on a frequency domain formulation of acoustic conservation equations, in which non-uniform temperature fields and distributed thermoacoustic source terms / flame transfer functions can be straightforwardly considered. The relative contribution of flame displacement and deformation driving mechanisms — i.e. their significance with respect to the total driving — is identified. Furthermore, promoting/ inhibiting conditions for the occurrence of high frequency, transversal acoustic instabilities within swirl-stabilized gas turbine combustors are revealed.
Skip Nav Destination
ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition
June 13–17, 2016
Seoul, South Korea
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-4976-7
PROCEEDINGS PAPER
High-Frequency Thermoacoustic Modulation Mechanisms in Swirl-Stabilized Gas Turbine Combustors: Part Two — Modeling and Analysis
Tobias Hummel,
Tobias Hummel
Technische Universität München, Garching, Germany
Search for other works by this author on:
Frederik Berger,
Frederik Berger
Technische Universität München, Garching, Germany
Search for other works by this author on:
Michael Hertweck,
Michael Hertweck
Technische Universität München, Garching, Germany
Search for other works by this author on:
Bruno Schuermans,
Bruno Schuermans
Technische Universität München, Garching, Germany
Search for other works by this author on:
Thomas Sattelmayer
Thomas Sattelmayer
Technische Universität München, Garching, Germany
Search for other works by this author on:
Tobias Hummel
Technische Universität München, Garching, Germany
Frederik Berger
Technische Universität München, Garching, Germany
Michael Hertweck
Technische Universität München, Garching, Germany
Bruno Schuermans
Technische Universität München, Garching, Germany
Thomas Sattelmayer
Technische Universität München, Garching, Germany
Paper No:
GT2016-57500, V04BT04A025; 13 pages
Published Online:
September 20, 2016
Citation
Hummel, T, Berger, F, Hertweck, M, Schuermans, B, & Sattelmayer, T. "High-Frequency Thermoacoustic Modulation Mechanisms in Swirl-Stabilized Gas Turbine Combustors: Part Two — Modeling and Analysis." Proceedings of the ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. Volume 4B: Combustion, Fuels and Emissions. Seoul, South Korea. June 13–17, 2016. V04BT04A025. ASME. https://doi.org/10.1115/GT2016-57500
Download citation file:
21
Views
0
Citations
Related Proceedings Papers
Related Articles
Thermoacoustic Modeling of a Gas Turbine Using Transfer Functions Measured Under Full Engine Pressure
J. Eng. Gas Turbines Power (November,2010)
Sub-Scale Demonstration of the Active Feedback Control of Gas-Turbine Combustion Instabilities
J. Eng. Gas Turbines Power (April,2000)
High-Frequency Thermoacoustic Modulation Mechanisms in Swirl-Stabilized Gas Turbine Combustors—Part II: Modeling and Analysis
J. Eng. Gas Turbines Power (July,2017)
Related Chapters
Microstructure Evolution and Physics-Based Modeling
Ultrasonic Welding of Lithium-Ion Batteries
Outlook
Closed-Cycle Gas Turbines: Operating Experience and Future Potential
Combined Cycle Power Plant
Energy and Power Generation Handbook: Established and Emerging Technologies