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• W2912962639 abstract "The ability to generate useful control forces on lifting surfaces at high angles of attack is particularly challenging due to boundary layer separation. A miniature collection of feathers on birds termed the alula, appears an intriguing solution to this control problem. Using surface-oil visualizations and direct force and moment measurements, we experimentally investigate the aerodynamics of a model alula(e) affixed to a thin, flat-plate, rectangular wing. A critical parameter of the deflected alula considered, is not its orientation relative to the incoming flow, but rather its spanwise distance from the wing tip to which it is oriented. Control forces (lift and rolling moment) are proportional to this distance over a wide range of angles of attack. When centered on the stalled wing, a single alula generates a rolling moment of magnitude comparable to that produced by a conventional trailing-edge flap aileron in an attached-flow condition. Importantly, the wetted area of the alula is one order of magnitude less than the reference flap aileron. The uncharacteristically large control force of the alula stems from its ability to induce and stabilize a vortex that sweeps outboard across the span of the wing towards the wing tip. Changing the distance of the alula from the wing tip, varies the length of this ‘sweeping vortex’ and its associated interactions with the wing. A novel high-angle-of-attack control solution is proposed, the sliding alula, which entails coordinated shifting of two alulae to manipulate the length and asymmetry of stabilized ‘sweeping vortices’ on stalled wings. Results regarding control authority in cross-flow and the gust mitigation potential of the sliding alula are also discussed." @default.
• W2912962639 created "2019-02-21" @default.
• W2912962639 creator A5051929376 @default.
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• W2912962639 date "2019-04-01" @default.
• W2912962639 modified "2023-10-18" @default.
• W2912962639 title "Investigation of a sliding alula for control augmentation of lifting surfaces at high angles of attack" @default.
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• W2912962639 doi "https://doi.org/10.1016/j.ast.2019.02.008" @default.
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