Type of Document Master's Thesis Author Liljenberg, Scott Alan Author's Email Address firstname.lastname@example.org URN etd-10232000-10320002 Title Modeling and Stability Analysis of Thermoacoustic Instabilities in Gas Turbine Combustor Sections Degree Master of Engineering Department Mechanical Engineering Advisory Committee
Advisor Name Title Saunders, William R. Committee Chair Vandsburger, Uri Committee Co-Chair West, Robert L. Jr. Committee Member Keywords
- Linear Systems
- Thermoacoustic Instabilities
- Time Delay
Date of Defense 2000-10-05 Availability unrestricted Abstract
In order to predict the linear stability of combustion systems in industrial-scale gas turbines, a stability analysis was completed using models generated for each of the major dynamic components. Changes in the combustion process of gas turbines to reduce emissions has resulted in large amplitude pressure oscillations associated with a coupling between the natural acoustic modes of the combustor and the unsteady heat release from the flame. Detailed models of the acoustics and the heat release processes were created and assembled, with a time delay element and the appropriate scaling, into a system block diagram to investigate the stability of the system using linear system theory. Wherever possible the analytical models were validated with experimental data. The main goal of this work was to create a design methodology which could be used by industry to predict where instabilities were likely to occur during the design phase. Results show that the system based stability analysis can predict some of the instability frequencies seen in the experimental data, but more refined models are needed to predict every instability. Future work will involve designing experiments to validate and refine the dynamic models already developed.
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