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Coexistence of dual wing–wake interaction mechanisms during the rapid rotation of flapping wings

Published online by Cambridge University Press:  16 May 2024

Long Chen Open the ORCID record for Long Chen [Opens in a new window]  and
Jianghao Wu Open the ORCID record for Jianghao Wu [Opens in a new window]
Long Chen
Affiliation:
School of Transportation Science and Engineering, Beihang University, Beijing 100191, PR China School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, PR China
Jianghao Wu*
Affiliation:
School of Transportation Science and Engineering, Beihang University, Beijing 100191, PR China
*
†Email address for correspondence: buaawjh@buaa.edu.cn
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Abstract

Insects flip their wings around each stroke reversal and may enhance lift in the early stage of a half-stroke. The possible lift-enhancing mechanism of this rapid wing rotation and its strong connection with wake vortices are still underexplored, especially when unsteady leading-edge vortex (LEV) behaviours occur. Here, we numerically studied the lift generation and underlying vorticity dynamics during the rapid rotation of a low aspect ratio flapping wing at a Reynolds number (${\textit {Re}}$) of 1500. Our findings prove that when the outboard LEV breaks down, an advanced rotation can still enhance the lift in the early stage of a half-stroke, which originates from an interaction with the breakdown vortex in the outboard region. This interaction, named the breakdown-vortex jet mechanism, results in a jet and thus a higher pressure on the upwind surface, including a stronger wingtip suction force on the leeward surface. Although the stable LEV within the mid-span retains its growth and location during an advanced rotation, it can be detrimental to lift enhancement as it moves underneath the wing. Therefore, for a flapping wing at ${\textit {Re}}\sim 10^3$, the interactions with stable and breakdown leading-edge vortices lead to the single-vortex suction and breakdown-vortex jet mechanisms, respectively. In other words, the contribution of wing–wake interaction depends on the spanwise location. The current work also implies the importance of wing kinematics to this wing–wake interaction in flapping wings, and provides an alternative perspective for understanding this complex flow phenomenon at ${\textit {Re}}\sim 10^3$.

JFM classification

Biological Fluid Dynamics: Swimming/flying Vortex Flows: Vortex dynamics
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 987 , 25 May 2024 , A16
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Copyright
© The Author(s), 2024. Published by Cambridge University Press

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