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Control of a Post-Stall Airfoil Using Pulsed Jets

Hipp, Kyle D
http://rave.ohiolink.edu/etdc/view?acc_num=osu1458565037

Abstract Details

2016, Master of Science, Ohio State University, Aero/Astro Engineering.
The performance of active flow control on a NACA 643-618 laminar airfoil at post-stall angles of attack is evaluated using discrete, wall-normal pulsed jets. Actuation is implemented near the leading edge of the airfoil. For actuation periods equal to one convective period, and two convective periods at a chord Reynolds number of 64,000, the time-average lift coefficient increases monotonically as the actuation duty cycle is reduced, for a given blowing ratio. Flow reattachment is achieved following the termination of a short duration pulse, enclosing a separation bubble. The reattachment point propagates towards the trailing edge at a rate three times slower than the convective period of the flow. Extended jet off-times can cause full separation to reoccur should the reattachment point reach the trailing edge, however optimal jet off-times can cause suction pressure to extend over much of the airfoil chord. Higher duty cycle actuation results in a phase shift of the dynamics that appears to be commensurate with the duration of the jet. A disturbance initiated by the termination of the jet causes a delay in the redevelopment of the shear layer and the reattachment of the flow, prohibiting high lift values from being attained. Data collected at multiple post-stall angles of attack show that the rate at which the reattachment point propagates downstream increases with higher angles of attack. At twice the Reynolds number, the same dynamics appear to persist however a weak suction pressure recovery over the extent of the separation bubble reduces the distinction in time-averaged lift between short and long jet pulse durations.
Jeffrey Bons (Advisor)
James Gregory (Committee Member)
Aerospace Engineering; Engineering; Experiments
aerodynamics; flow control; fluid dynamics

Recommended Citations

Citations

  • Hipp, K. D. (2016). Control of a Post-Stall Airfoil Using Pulsed Jets [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1458565037

    APA Style (7th edition)

  • Hipp, Kyle. Control of a Post-Stall Airfoil Using Pulsed Jets. 2016. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1458565037.

    MLA Style (8th edition)

  • Hipp, Kyle. "Control of a Post-Stall Airfoil Using Pulsed Jets." Master's thesis, Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1458565037

    Chicago Manual of Style (17th edition)

osu1458565037
883
© 2016, some rights reserved.Creative Commons License Control of a Post-Stall Airfoil Using Pulsed Jets by Kyle D Hipp is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by The Ohio State University and OhioLINK.