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Validation of a Physics-Based Low-Order Thermo-Acoustic Model of a Liquid-Fueled Gas Turbine Combustor and its Application for Predicting Combustion Driven Oscillations

Knadler, Michael
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1511861629413018

Abstract Details

2017, PhD, University of Cincinnati, Engineering and Applied Science: Aerospace Engineering.
This research validates a physics based model for the thermo-acoustic behavior of a liquid-fueled gas turbine combustor as a tool for diagnosing the cause of combustion oscillations. A single nozzle, acoustically tunable gas turbine combustion rig fueled with Jet-A was built capable of operating in the unsteady combustion regime. A parametric study was performed with the experimental rig to determine the operating conditions resulting in thermoacoustic instabilities. The flame transfer function has been determined for varying fuel injection and flame stabilization arrangements to better understand the feedback loop concerning the heat release and acoustics. The acoustic impedance of the boundaries of the combustion system was experimentally determined. The results were implemented in a COMSOL Multiphysics model as complex impedance boundary conditions at the inlet and exit and a source term to model the flame and heat release. The validity of that model was determined based on an eigenvalue study comparing both the frequency and growth rate of the eigenvalues with the experimentally measured frequencies and pressures of the stable and unstable operating conditions. The model demonstrated that it can accurately predict the instability of the examined operating conditions. The model also closely predicted the frequency of instability and demonstrated the usefulness of including the experimentally determined acoustic boundary conditions over idealized sound hard boundaries.
Jongguen Lee, Ph.D. (Committee Chair)
Jay Kim, Ph.D. (Committee Member)
Kwanwoo Kim, Ph.D. (Committee Member)
Mark Turner, Sc.D. (Committee Member)
150 p.
Aerospace Materials
Combustion; Combustion Instabilities; Thermoacoustics; Gas Turbine Combustion

Recommended Citations

Citations

  • Knadler, M. (2017). Validation of a Physics-Based Low-Order Thermo-Acoustic Model of a Liquid-Fueled Gas Turbine Combustor and its Application for Predicting Combustion Driven Oscillations [Doctoral dissertation, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1511861629413018

    APA Style (7th edition)

  • Knadler, Michael. Validation of a Physics-Based Low-Order Thermo-Acoustic Model of a Liquid-Fueled Gas Turbine Combustor and its Application for Predicting Combustion Driven Oscillations. 2017. University of Cincinnati, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1511861629413018.

    MLA Style (8th edition)

  • Knadler, Michael. "Validation of a Physics-Based Low-Order Thermo-Acoustic Model of a Liquid-Fueled Gas Turbine Combustor and its Application for Predicting Combustion Driven Oscillations." Doctoral dissertation, University of Cincinnati, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1511861629413018

    Chicago Manual of Style (17th edition)

ucin1511861629413018
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© 2017, all rights reserved.
This open access ETD is published by University of Cincinnati and OhioLINK.