Aerodynamic interaction of bristled wing pairs in fling
TLDR
In this article, the authors examined the wing-wing interaction of bristled wings in fling at Re = 10 as a function of initial inter-wing spacing (δ) and degree of overlap between rotation and linear translation.Abstract:
Tiny flying insects of body lengths under 2 mm use the “clap-and-fling” mechanism with bristled wings for lift augmentation and drag reduction at a chord-based Reynolds number (Re) on O ( 10 ). We examine the wing–wing interaction of bristled wings in fling at Re = 10 as a function of initial inter-wing spacing (δ) and degree of overlap between rotation and linear translation. A dynamically scaled robotic platform was used to drive physical models of bristled wing pairs with the following kinematics (all angles relative to vertical): (1) rotation about the trailing edge to angle θr, (2) linear translation at a fixed angle (θt), and (3) combined rotation and linear translation. The results show that (1) the cycle-averaged drag coefficient decreased with increasing θr and θt and (2) decreasing δ increased the lift coefficient owing to increased asymmetry in the circulation of leading and trailing edge vortices. A new dimensionless index, reverse flow capacity (RFC), was used to quantify the maximum possible ability of a bristled wing to leak the fluid through the bristles. The drag coefficients were larger for smaller δ and θr despite larger RFC, likely due to the blockage of inter-bristle flow by shear layers around the bristles. Smaller δ during early rotation resulted in the formation of strong positive pressure distribution between the wings, resulting in an increased drag force. The positive pressure region weakened with increasing θr, which in turn reduced the drag force. Tiny insects have been previously reported to use large rotational angles in fling, and our findings suggest that a plausible reason is to reduce drag forces.read more
Citations
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TL;DR: In this article , the authors combine three-dimensional reconstructions of morphology and kinematics in one of the smallest insects, the beetle Paratuposa placentis (body length 395 μm), and show that this performance results from a reduced wing mass and a previously unknown type of wing motion cycle.
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A novel flight style allowing the smallest featherwing beetles to excel
Sergey E. Farisenkov,Dmitry Kolomenskiy,Pyotr N. Petrov,Nadezhda Lapina,Thomas Engels,Fritz-Olaf Lehmann,Ryo Onishi,Hao Liu,Alexey A. Polilov +8 more
TL;DR: In this paper, the authors combine three-dimensional reconstructions of morphology and kinematics in one of the smallest insects, Paratuposa placentis (body length 395 μm), and show that the bristled wing follows a figure-eight loop that consists of subperpendicular up and down strokes followed by claps at stroke reversals, above and below the body.
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Interspecific variation in bristle number on forewings of tiny insects does not influence clap-and-fling aerodynamics.
TL;DR: In this paper, the effects of dimensional and non-dimensional geometric variables on dimensionless lift and drag of tiny flying insects have been examined, and it was found that increasing G reduced drag more than decreasing D, changing n had minimal impact on lift generation, and varying G/D minimally affected aerodynamic forces.
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