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The Leading Edge Vortex (LEV) is a low-pressure core that forms on the leading edge of the wing during flapping and remains attached instead of breaking off as would occur on an airplane wing. This mechanism, discovered first in insects and then in maple seeds, allows lift coefficients 23 times higher than those predicted by classical theory. The LEV is kept stable by axial flow along the span (spin effect) that extracts vorticity from the core before it overgrows and detaches. In insects with wings that rotate rather than transport (such as Drosophila), the stability of the LEV is the main supporting mechanism. The Polhamus model separates the potential circulation contribution (proportional to sin cos ) from the vortex contribution (proportional to sin²), explaining the non-linear increase in lift with angle of attack.

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ID:('ky', 356)

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ID:(0, 356)