Skip to Main Content
 

Global Search Box

 
 
 

ETD Abstract Container

Abstract Header

Replicating the Effects of a Passive Boundary-Layer Fence via Active Flow Control

Walker, Michael Monroe

Abstract Details

2018, Doctor of Philosophy, Ohio State University, Aeronautical and Astronautical Engineering.
The effect of passive and active boundary-layer fences (BLF) on a NACA 643-618 laminar wing (aspect ratio = 4.3) at a chordwise Reynolds number of 100,000 with sweep (lambda = 30°) is evaluated. The application of a passive BLF at z/b = 0.7 is responsible for an increase in the maximum lift coefficient (CL max) of 14.3%, a higher stall angle of attack (alpha) by 10°, and a delay in alpha by 16° where an unstable longitudinal static stability derivative (CMalpha) first occurs. The application of an active flow control (AFC) wall-normal steady blowing slot at z/b = 0.7 is responsible for an increase in CL max of 12.8%, a higher stall alpha by 17°, and a delay in alpha of 23° where an unstable CMalpha first occurs. Stereo-PIV results reveal that both configurations (passive BLF and AFC slot) create two vortices (a fence vortex and a tip vortex) which along with the physical fence itself are responsible for restoring lift outboard of the fence/slot, resulting in beneficial performance gains observed at higher alpha. Surface flow visualization via fluorescent tufts corroborates these findings. Duplicating (and even improving upon) the effects of passive flow control through active flow control allows for significant performance benefits at higher alpha (with AFC turned on), while avoiding the drag penalties of a passive fence by turning AFC off at lower a where control is unnecessary. Computational simulations of similar test configurations are performed match well with experimental results, further enhancing confidence of findings and showing promise for future predictive tools with respect to this form of active flow control as applied to a swept-wing.
Jeffrey Bons (Advisor)
Mohammad Samimy (Committee Member)
James Gregory (Committee Member)
153 p.

Recommended Citations

Citations

  • Walker, M. M. (2018). Replicating the Effects of a Passive Boundary-Layer Fence via Active Flow Control [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1524146958877311

    APA Style (7th edition)

  • Walker, Michael. Replicating the Effects of a Passive Boundary-Layer Fence via Active Flow Control. 2018. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1524146958877311.

    MLA Style (8th edition)

  • Walker, Michael. "Replicating the Effects of a Passive Boundary-Layer Fence via Active Flow Control." Doctoral dissertation, Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1524146958877311

    Chicago Manual of Style (17th edition)