Low Reynolds' Number Application of Feather Inspired Passive High Lift Device on Finite Wing

Wang, C.; Schlüter, Jörg

doi:10.2514/6.2013-2669

Cited by 2 publications

(3 citation statements)

References 12 publications

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“…Figure 1 shows a duck and a raven, both with pop-up flap deployed during landing. This behaviour of bird wings has been mimicked in various experiments with a flap attached to the top surface of a wing (8)(9)(10)(11)(12)(13) . The flap is hinged about its leading edge and the trailing edge of the flap is left free.…”

Section: Background Information -High-lift Effectorsmentioning

confidence: 99%

“…The effect of the passive flap was successfully quantified in 1996 at the German Aerospace Center (DLR) with a similar experiment to the Messerschmitt 109, but utilising a passive flap attached to each wing of a glider with an HQ-41 aerofoil. The flap was found to produce a 7% increase in coefficient of lift (C L ) at stall (12,15) . In the years since 1997, many researchers have advanced our understanding of the pop-up flap in many areas including: optimisation of flap size and position (12,14,(16)(17)(18) , optimisation of flap material and geometry (9,17,19) , flap deployment angle (10,(19)(20)(21)(22) , flap performance at low Reynolds Number (Re) (11) , using pop-up flaps for drag reduction (23) , dynamic testing with the pop-up flap (24) , testing of pop-up flaps on highly elliptical low AR wings (25) , kinematics and stability of the wing and flap (26)(27)(28) , the effects of having multiple flaps (18) , and how hairy surfaces can have a similar function to the pop-up flap (8,29) .…”

Section: Background Information -High-lift Effectorsmentioning

confidence: 99%

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Investigation of self-deploying high-lift effectors applied to membrane wings

Osterberg

Albertani

2017

Aeronaut. j.

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Flow separation followed by aerodynamic stall limits the operation of aircraft. Expanding the flight envelope of aircraft has been a goal of aerodynamicists for decades. This work presents findings from tests in the Oregon State University wind tunnel investigating the effectiveness of a passively actuated suction-surface flap on membrane wings. Experiments were conducted on a rigid plate and membrane wings with and without a pop-up flap. All wings had an aspect ratio of 2, while membrane pre-strain and Reynolds number were varied. An increase in lift at stall was observed for all testing conditions with flap deployment. The observed average increase in maximum lift varied from 5% to 15% for different test conditions. The variation in flap effectiveness is compared to membrane pre-strain, Reynolds number, and wing camber. A quadratic relationship between modelled camber and flap effectiveness is observed, and an optimal level of membrane camber is found to maximise flap effectiveness.

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Section: Background Information -High-lift Effectorsmentioning

confidence: 99%

Section: Background Information -High-lift Effectorsmentioning

confidence: 99%

Investigation of self-deploying high-lift effectors applied to membrane wings

Osterberg

Albertani

2017

Aeronaut. j.

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“…Therefore, researchers are now turning their attention back to natural fliers for inspiration. Their hope is that hidden somewhere in the fundamental flight characteristics and features of a bird, lay the necessary keys that will unlock more efficient and more advanced unmanned aerial vehicles and micro aerial vehicles[1,10].…”

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confidence: 99%

Comparative Analysis of Uninhibited and Constrained Avian Wing Aerodynamics

Cox¹

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Comparative Analysis of Uninhibited and Constrained Avian Wing Aerodynamics Jordan A. Cox I would like to thank the West Virginia Space Grant Consortium (WVSGC) for their support. By awarding me with a graduate fellowship, the WVSGC made it possible for me to purchase the materials needed for this research and allowed me the financial freedom to devote the required time to this project. Furthermore, I would like to thank Mrs. Candy Cordwell for all of her help during my graduate studies. It was through her willingness to help that I became aware of the opportunities that the WVSGC offered. I would also like to thank my research advisor, Dr. Patrick Browning, for his guidance during my graduate studies. Dr. Browning was always willing to provide the support needed to keep my project on track. Together, we spent many late nights and university holidays when no other professor was in sight, collecting data, building models, or working out what the next step for my project should be. By answering several late night phone calls and quickly responding emails late at night and on weekends, Dr. Browning helped me to keep this project moving.

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Low Reynolds' Number Application of Feather Inspired Passive High Lift Device on Finite Wing

Cited by 2 publications

References 12 publications

Investigation of self-deploying high-lift effectors applied to membrane wings

Investigation of self-deploying high-lift effectors applied to membrane wings

Comparative Analysis of Uninhibited and Constrained Avian Wing Aerodynamics

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