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Effects of wing deformation on aerodynamic performance of a revolving insect wing

Acta Mechanica Sinica 2014年第6期30卷 819-827页

作者： Ryusuke Noda Toshiyuki Nakata Hao Liu Graduate School of Engineering Chiba University 1-33 Yayoi-cho Inage-ku Chiba Japan Shanghai Jiao Tong University and Chiba University International Cooperative Research Center (SJTU-CUICRC) Structure and Motion Laboratory The Royal Veterinary CollegeUniversity of London Hawkshead LaneNorth Mymms Hatfield AL9 7TA United Kingdom

Flexible wings of insects and bio-inspired micro air vehicles generally deform remarkably during flapping flight owing to aerodynamic and inertial forces,which is of highly nonlinear fluid-structure interaction（FSI）*** elucidate the novel mechanisms associated with flexible wing aerodynamics in the low Reynolds number regime,we have built up a FSI model of a hawkmoth wing undergoing revolving and made an investigation on the effects of flexible wing deformation on aerodynamic performance of the revolving wing *** take into account the characteristics of flapping wing kinematics we designed a kinematic model for the revolving wing in two-fold：acceleration and steady rotation,which are based on hovering wing kinematics of hawkmoth,Manduca *** results show that both aerodynamic and inertial forces demonstrate a pronounced increase during acceleration phase,which results in a significant wing *** the aerodynamic force turns to reduce after the wing acceleration terminates due to the burst and detachment of leading-edge vortices（LEVs）,the dynamic wing deformation seem to delay the burst of LEVs and hence to augment the aerodynamic force during and even after the *** the phase of steady rotation,the flexible wing model generates more ver-tical force at higher angles of attack（40°–60°）but less horizontal force than those of a rigid wing *** is because the wing twist in spanwise owing to aerodynamic forces results in a reduction in the effective angle of attack at wing tip,which leads to enhancing the aerodynamics performance by increasing the vertical force while reducing the horizontal ***,our results point out the importance of the fluid-structure interaction in evaluating flexible wing aerodynamics：the wing deformation does play a significant role in enhancing the aerodynamic performances but works differently during acceleration and steady rotation,which is mainly induced by inertial force in accelerati

关键词： Insect flight Flexible wing revolving wing Fluid-structure interaction

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Aerodynamic performance of hovering micro revolving wings in ground and ceiling effects at low Reynolds number

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Chinese Journal of Aeronautics 2023年第1期36卷 152-165页

作者： Jinjing HAO Yanlai ZHANG Chao ZHOU Songtao CHU Jianghao WU School of Transportation Science and Engineering Beihang UniversityBeijing 100083China

Numerous investigations have been conducted to understand the wall effects on *** purpose of this study is to further investigate the aerodynamic performance of revolving wings,especially when it is very close to the ground and ceiling(i.e.,less than half the wingspan)at low Reynolds ***,the ground and ceiling effect for hovering micro revolving wings at low Reynolds numbers are investigated by improving the theoretical *** theoretical model for the ground effect is established based on the wall-jet assumption,and that for the ceiling effect is improved by considering the uneven spanwise distribution of induced *** two models are validated by comparing the results of experiments and CFD simulations with the Lattice-Boltzmann Method(LBM).Both ground and ceiling effects are found helpful to enhance the thrust,especially with small wing-wall distances,by making a difference to the induced velocity and the pressure *** comparing the thrust generation and aerodynamic efficiency between the ground and ceiling effects,the former is found more helpful to the thrust augmentation,and the latter is more beneficial for the aerodynamic efficiency promotion.

关键词： Ceiling effect Flapping wing Ground effect Micro air vehicle revolving wing

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