Post-Stall Flow Control of Sharp-Edged Wings via Unsteady Blowing

Rullan, Jose; Vlachos, Pavlos P.; Telionis, Demetri P.; Zeiger, Matthew

doi:10.2514/1.19495

Cited by 12 publications

(1 citation statement)

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“…The results of the study suggest that transverse velocity fluctuations from local excitation can control the leading-edge flow separation effectively. Similar to the vibrating wire, an unsteady forcing technique using periodic jet impulses, namely the ''synthetic jet'', was employed as an effective actuators 71 in active flow control applications for delaying stall and increasing lift, [72][73][74][75][76][77][78][79] thrust enhancement, 80 and tip vortex control. 81,82 The outcomes indicated that such an unsteady forcing technique using periodic jet impulses could energize shear layer instabilities and result in reattachment over the suction surface of the wing.…”

Section: Active Flow Control Approachesmentioning

confidence: 99%

Review of self-induced roll oscillations and its attenuation for low-aspect-ratio wings

2019

Proceedings of the Institution of Mechanical Engineers, Part G:

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Micro aerial vehicles are currently receiving growing interest because of their broad applications in many fields. In their flight tests, the onset of unwanted large amplitude roll oscillations was reported, which resulted in difficulties with flight control, and this has become one of the major challenges of current micro aerial vehicles design. In this review type of article, the low Reynolds number flow characteristics of a low-aspect-ratio wing are reviewed, and the self-induced roll oscillations are discussed with special attention being payed to the interaction between the three-dimensional flow structure and wing in reciprocatively rolling motion. The roll attenuation methods are introduced via flow control approaches, which can suppress the roll oscillations effectively by manipulating the leading-edge flow separation and tip vortices of the low-aspect-ratio wings.

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