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Characterization of Combustion Dynamics in a Liquid Model Gas Turbine Combustor Under Fuel-Rich Conditions

Weber, Matthew F
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1562060065192189

Abstract Details

2019, MS, University of Cincinnati, Engineering and Applied Science: Aerospace Engineering.
This research provides an experimental investigation into the behavior of naturally occurring, fuel-rich, unstable combustion of liquid fuel in a gas turbine combustor. Testing was done using an acoustically isolated single nozzle combustion test rig using liquid Jet-A fuel, capable of operating under unstable combustion conditions. A test matrix was established to identify operating conditions that incited high combustion instability in fuel-rich conditions. The pressure and flame intensity emissions were analyzed across the test matrix in both time and frequency domains. The Rayleigh Criterion was applied to identify the presence of thermo-acoustic instabilities using combustor pressure and flame emission fluctuations. The flame response was established to further characterize the flame dynamics using using the combustor velocity and flame emission fluctuations. Periodic flame structure and behavior was determined using a high speed camera and compared to the convection time delays calculated via flame emission measurements. The investigation concluded that for cases with sufficiently high pressure fluctuations, the Rayleigh Criterion identified thermo-acoustic instability in fuel-rich combustion. The high-speed video and flame emission measurements revealed the spatial and temporal characteristics of emissions in the OH*-band, indicating that it serves as the best approximation for heat release in a fuel-rich flame. Additionally, the high speed camera video and flame emission measurements indicated that CH*-band emissions convectively lag OH*-band emissions.
Jongguen Lee, Ph.D. (Committee Chair)
San-Mou Jeng, Ph.D. (Committee Member)
Kwanwoo Kim, Ph.D. (Committee Member)
89 p.
Aerospace Materials
Fuel-rich Combustion; Combustion Dynamics; Gas Turbine Combustion; Combustion Instability

Recommended Citations

Citations

  • Weber, M. F. (2019). Characterization of Combustion Dynamics in a Liquid Model Gas Turbine Combustor Under Fuel-Rich Conditions [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1562060065192189

    APA Style (7th edition)

  • Weber, Matthew. Characterization of Combustion Dynamics in a Liquid Model Gas Turbine Combustor Under Fuel-Rich Conditions. 2019. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1562060065192189.

    MLA Style (8th edition)

  • Weber, Matthew. "Characterization of Combustion Dynamics in a Liquid Model Gas Turbine Combustor Under Fuel-Rich Conditions." Master's thesis, University of Cincinnati, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1562060065192189

    Chicago Manual of Style (17th edition)

ucin1562060065192189
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© 2019, all rights reserved.
This open access ETD is published by University of Cincinnati and OhioLINK.