Leading-edge vortex of flapping wings in freestream
Jong-Seob HAN
Technical University of Munich
https://scholar.google.co.kr/citations?user=dKz2xv4AAAAJ&hl=ko
Date(s) : 08/12/2021 iCal
14h00 - 15h00
Leading-edge vortex (LEV) attachment on the wings of biological flyers is one key phenomenon explaining their superior aerodynamic performances and a high degree of aerial agility. Tremendous follow-up studies have revealed that the radial pressure gradient induced by the Coriolis acceleration, which is originally driven by the revolving/flapping motion of the wings, stabilizes the LEV with the spanwise flow. Complicated wingbeat kinematics, undulating surroundings, and unsteady wake vortex dynamics, however, have confined most of the studies to that in hover, despite the fact that staying particular point in space is very rare for most biological flyers and that an inflow during maneuvering would directly affect the LEV stability. This talk will deal with the LEV characteristics when it meets the inflow. The effect of a freestream on the LEV behavior will be dealt with, considering their sweptback angle and consequent spanwise flow. The effect of a steady lateral inflow on the LEV will also be discussed in conjunction with their flight stability.
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