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Exploration of Active Flow Control to Enable a Variable Area Turbine

Spens, Alexander
http://orcid.org/0000-0002-4340-6778
http://rave.ohiolink.edu/etdc/view?acc_num=osu168978160922563

Abstract Details

2023, Doctor of Philosophy, Ohio State University, Aero/Astro Engineering.
The feasibility of an active flow control enabled variable area turbine was explored. Pressurized air was ejected from the nozzle guide vanes to reduce the effective choke area, and mass flow rate through, the turbine inlet. A set of experimental and computational studies were conducted with varying actuator types and parameters to determine their effectiveness and develop models of the flow physics. Preliminary results from a simple quasi-1D converging-diverging nozzle, with an injection flow slot upstream of the throat, showed a 2.2:1 ratio between throttled mass flow rate and injected mass flow rate at a constant nozzle pressure ratio. The penetration of the injection flow and corresponding reduction in the primary flow streamtube were successfully visualized using a shadowgraph technique. Building on this success, a representative single passage nozzle guide vane transonic flowpath was constructed to demonstrate feasibility beyond the quasi-1D converging-diverging nozzle. Both secondary slot blowing from the vane pressure surface and vane suction surface just upstream of the passage throat again successfully reduced primary flow. In addition, fluidic vortex generators were used on the adjacent suction surface to reduce total pressure loss along the midspan and further throttle the primary flow. Computational fluid dynamics simulations were used to explore the effects of a variety of parameters on the flow blockage and actuator effectiveness. Simplified models were developed to describe the relationships of various factors impacting flow blockage, turning angle, and total pressure loss. Finally, the active flow control systems were simulated at engine relevant pressures and temperatures and found to have only a minimal drop in total pressure recovery and effectiveness, which could be predicted by the simplified blockage model.
Jeffrey Bons (Advisor)
Datta Gaitonde (Committee Member)
Randall Mathison (Committee Member)
126 p.
Aerospace Engineering
Variable Area Turbine; High Pressure Turbine; Nozzle Guide Vane; Active Flow Control; Variable Turbine Vane

Recommended Citations

Citations

  • Spens, A. (2023). Exploration of Active Flow Control to Enable a Variable Area Turbine [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu168978160922563

    APA Style (7th edition)

  • Spens, Alexander. Exploration of Active Flow Control to Enable a Variable Area Turbine. 2023. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu168978160922563.

    MLA Style (8th edition)

  • Spens, Alexander. "Exploration of Active Flow Control to Enable a Variable Area Turbine." Doctoral dissertation, Ohio State University, 2023. http://rave.ohiolink.edu/etdc/view?acc_num=osu168978160922563

    Chicago Manual of Style (17th edition)

osu168978160922563
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© 2023, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.