دورية أكاديمية
Aerodynamics of a Wing with a Wingtip Flapper
| العنوان: | Aerodynamics of a Wing with a Wingtip Flapper |
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| المؤلفون: | Zhao, Longfei, Shkarayev, Sergey, Su, Erlong |
| المساهمون: | Univ Arizona, Dept Aerosp & Mech Engn |
| المصدر: | Fluids ; 3 ; 2 ; 29 |
| بيانات النشر: | MDPI |
| سنة النشر: | 2018 |
| المجموعة: | The University of Arizona: UA Campus Repository |
| مصطلحات موضوعية: | wing, flapping, lift, drag, wake, vortex |
| الوصف: | In the present study, an oscillating membrane flapper was pivotally attached to the tip of a conventional rigid wing. Stroke-averaged aerodynamic forces were measured for the range of the flapping frequency, showing significant increases in the lift coefficient and lift-to-drag ratio for the wing with a flapper. Major vortex patterns were deduced from observations of smoke-wire visualization and 2D phase-locked particle image velocimetry (PIV). The centerline of the primary vortex wanders in the counterclockwise direction. On the contrary, its core rotates in the same sense of rotation as a wingtip vortex in a conventional wing. The secondary weaker vortex of opposite rotation lasts for a half stroke. The vortex ring sheds from the flapper during the second half of the upstroke and pronation. The outer parts of the vortex system are much stronger than the inner ones. The circulation and size of vortices decrease significantly at the most distant station from the wing. Strong vertical jets were found in smoke-wire visualization and confirmed with velocity and vorticity fields obtained by PIV. These jets are formed between undulating vortices and inside of the vortex ring. The jet airflow moves away from the flapper and downward or upward depending on the flapping direction. ; Open access journal. ; This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| تدمد: | 2311-5521 |
| العلاقة: | http://www.mdpi.com/2311-5521/3/2/29Test; Zhao, L.; Shkarayev, S.; Su, E. Aerodynamics of a Wing with a Wingtip Flapper. Fluids 2018, 3, 29.; http://hdl.handle.net/10150/629152Test; FLUIDS |
| DOI: | 10.3390/fluids3020029 |
| الإتاحة: | https://doi.org/10.3390/fluids3020029Test http://hdl.handle.net/10150/629152Test |
| حقوق: | © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license. ; https://creativecommons.org/licenses/by/4.0Test/ |
| رقم الانضمام: | edsbas.A669E2AA |
| قاعدة البيانات: | BASE |
| تدمد: | 23115521 |
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| DOI: | 10.3390/fluids3020029 |