The PELskin project-part V: towards the control of the flow around aerofoils at high angle of attack using a self-activated deployable flap

Meccanica
Marco E RostiAlfredo Pinelli

Abstract

During the flight of birds, it is often possible to notice that some of the primaries and covert feathers on the upper side of the wing pop-up under critical flight conditions, such as the landing approach or when stalking their prey (see Fig. 1) . It is often conjectured that the feathers pop up plays an aerodynamic role by limiting the spread of flow separation . A combined experimental and numerical study was conducted to shed some light on the physical mechanism determining the feathers self actuation and their effective role in controlling the flow field in nominally stalled conditions. In particular, we have considered a NACA0020 aerofoil, equipped with a flexible flap at low chord Reynolds numbers. A parametric study has been conducted on the effects of the length, natural frequency, and position of the flap. A configuration with a single flap hinged on the suction side at 70 % of the chord size c (from the leading edge), with a length of [Formula: see text] matching the shedding frequency of vortices at stall condition has been found to be optimum in delivering maximum aerodynamic efficiency and lift gains. Flow evolution both during a ramp-up motion (incidence angle from [Formula: see text] to [Formula: see text] with ...Continue Reading

References

Jun 7, 2000·Die Naturwissenschaften·D W BechertR Meyer
Nov 21, 2007·The Journal of Experimental Biology·Anna C CarruthersGraham K Taylor
Apr 14, 2012·Bioinspiration & Biomimetics·Joe Johnston, Ashok Gopalarathnam
Oct 30, 2012·Physical Review Letters·Shervin BagheriAlessandro Bottaro
Feb 8, 2014·PloS One·Benjamin PonitzChristoph Brücker

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MPI
PELskin
PETSc

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