Passive control of roll oscillations of low-aspect-ratio wings using bleed

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Abstract

A passive flow control method, which uses bleed from a slot near the wing tip, has been shown to attenuate self-excited roll oscillations of a low-aspect-ratio (AR = 2) rectangular flat plate wing. This method was found to be successful across the whole range of angle of attack and better than previous active flow control methods. The effectiveness of the slot strongly depends on its location and width. For effective slot geometries, the tip vortex becomes less coherent, almost eliminating the roll oscillations. Nonlinear interactions between the shear layers shed from the tip and the slot, as well as between the shear layer and the counter-rotating vortex may act as excitation, which can modify the response of the self-sustained oscillator. When the slot is located too close to the tip, there is rapid merging of the shear layers and less interaction, and the slot loses its effectiveness. Also, when the slot is narrow, there is insufficient bleed, resulting in less effective attenuation. Force measurements revealed that this technique can be used as an effective method to suppress roll oscillations without sacrificing and possibly improving aerodynamic performance.
Original languageEnglish
Article number1752
Pages (from-to)1-16
Number of pages16
JournalExperiments in Fluids
Volume55
Early online date28 May 2014
DOIs
Publication statusPublished - 1 Jun 2014

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low aspect ratio wings
Low aspect ratio wings
Flow control
slots
Vortex flow
oscillations
Force measurement
Angle of attack
Merging
shear layers
Aspect ratio
Aerodynamics
Geometry
wing tips
vortices
low aspect ratio
angle of attack
flat plates
aerodynamics
wings

Cite this

Passive control of roll oscillations of low-aspect-ratio wings using bleed. / Hu, T.; Wang, Z.; Gursul, I.

In: Experiments in Fluids, Vol. 55, 1752, 01.06.2014, p. 1-16.

Research output: Contribution to journalArticle

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