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Thesis Murnieks Final Document.pdf (2.41 MB)

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Active Flow Control Using Trailing-Edge Coanda Actuators in a Propeller-Driven Flow

Murnieks, Victoria Aleksis
http://rave.ohiolink.edu/etdc/view?acc_num=osu1712762874729108

Abstract Details

2024, Master of Science, Ohio State University, Aerospace Engineering.
Various trailing-edge (TE) Coanda active flow control (AFC) actuator configurations were experimentally investigated in a propeller slipstream flow to simulate hover flight. This thesis will provide a comprehensive evaluation of the configuration factors—in terms of spanwise position and geometric parameters—which impact the aerodynamic and control authority performance of TE Coanda AFC actuators in propeller-driven flow with no freestream velocity. Two main types of TE Coanda AFC configuration experiments were conducted. The first type of testing involved varying the spanwise placement and size of TE AFC while maintaining constant internal geometry and circular Coanda profile shape with continuous slot blowing. The spanwise location testing's objectives were to determine the optimal Coanda AFC actuator location relative to the propeller slipstream and compare Coanda flow control effectiveness to that of a traditional deflection control surface. Two trailing-edge Coanda actuator sections of fixed spanwise length were designed, fabricated, and evaluated in terms of lift force and pitching moment generation at varying spanwise locations. Velocity profile measurements for this study for the case of no freestream flow indicated that the propeller slipstream is asymmetric over the NACA 0012 wing and contracts toward the side of the wing on which the propeller blade descends during rotation, where propeller downwash is experienced. This asymmetry indicated that there may be an optimum location for Coanda AFC actuators at the wing trailing edge which couple with momentum from the propeller in regions of peak slipstream velocity. The second type of testing involved varying TE AFC nozzle and surface profiles while maintaining constant spanwise location. These nozzles included both continuous and discrete slot blowing as well as sweeping jets. Surfaces investigated included circular, elliptical, and biconvex profiles. Each configuration was mounted to the trailing edge of a wing on a benchtop setup. A propeller at the leading edge provided a momentum source, and the lift and pitching moment were measured with a six-component load cell. The resulting load data was used to characterize the aerodynamic performance and control authority of each Coanda AFC configuration tested to determine which parameters—such as spanwise placement, Coanda AFC profile shape, slot size and spacing, and discrete vs. continuous slots—yield optimal performance for trailing-edge AFC. The efficiency of the actuators was evaluated using a modified form of momentum coefficient for the hover flight condition.
Matthew McCrink (Committee Member)
Jeffrey Bons (Advisor)
121 p.
Aerospace Engineering
VTOL; AFC; hover; flow control; Coanda; trailing-edge; propeller; no freestream; aerodynamics; propeller-wing interactions; aerospace; aerospace engineering

Recommended Citations

Citations

  • Murnieks, V. A. (2024). Active Flow Control Using Trailing-Edge Coanda Actuators in a Propeller-Driven Flow [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1712762874729108

    APA Style (7th edition)

  • Murnieks, Victoria. Active Flow Control Using Trailing-Edge Coanda Actuators in a Propeller-Driven Flow. 2024. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1712762874729108.

    MLA Style (8th edition)

  • Murnieks, Victoria. "Active Flow Control Using Trailing-Edge Coanda Actuators in a Propeller-Driven Flow." Master's thesis, Ohio State University, 2024. http://rave.ohiolink.edu/etdc/view?acc_num=osu1712762874729108

    Chicago Manual of Style (17th edition)

osu1712762874729108
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© 2024, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.