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Flow reattachment and vortex re-formation on oscillating low-aspect-ratio wings


Reference:

Vardaki, E., Wang, Z. and Gursul, I., 2008. Flow reattachment and vortex re-formation on oscillating low-aspect-ratio wings. AIAA Journal, 46 (6), pp. 1453-1462.

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Official URL:

http://dx.doi.org/10.2514/1.32233

Abstract

Effects of small-amplitude wing oscillations on flow reattachment and vortex re-formation in the poststall region were studied experimentally. Low-aspect-ratio delta and cropped delta wings with sweep angles in the range of A = 20-50 deg were tested. Effects of forcing frequency, amplitude, wing sweep angle, and mode of the wing oscillations were investigated. It was shown that wing oscillations at an appropriate frequency promotes the reattachment of the otherwise separated flow at poststall incidences. Moreover, with increasing frequency, leading-edge vortices develop with axial flow in the cores, followed by their breakdown. For an optimum range of Strouhal numbers, Sr = 1-2, vortex breakdown is delayed to a maximum distance from the apex. This range of Strouhal numbers compares well with the dominant frequencies of the shear layer instabilities. For sweep angles larger than 20 deg, the reattachment process is generic for all nonslender wings and there is an optimum range of Strouhal numbers.

Details

Item Type Articles
CreatorsVardaki, E., Wang, Z. and Gursul, I.
DOI10.2514/1.32233
Uncontrolled Keywordsrhenium, turbulent flow, aspect ratio, delta wing aircraft, strouhal number, strontium, vortex flow, photoacoustic effect, motion estimation
DepartmentsFaculty of Engineering & Design > Mechanical Engineering
Research CentresAerospace Engineering Research Centre
RefereedYes
StatusPublished
ID Code1396

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