The Progress of Aerodynamic Mechanisms Based on Avian Leading-Edge Alula and Future Study Recommendations
Birds in nature have many unique devices to help them acquire excellent flight abilities under various complex flight conditions. One of the unique devices is the leading-edge alula, located at the junction of the arm wing and the hand wing of most birds. It often spreads out during takeoff and land...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-10-01
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| Series: | Aerospace |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2226-4310/8/10/295 |
| _version_ | 1797515641962364928 |
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| author | Han Bao Bifeng Song Wenqing Yang Jianlin Xuan Dong Xue |
| author_facet | Han Bao Bifeng Song Wenqing Yang Jianlin Xuan Dong Xue |
| author_sort | Han Bao |
| collection | DOAJ |
| description | Birds in nature have many unique devices to help them acquire excellent flight abilities under various complex flight conditions. One of the unique devices is the leading-edge alula, located at the junction of the arm wing and the hand wing of most birds. It often spreads out during takeoff and landing, probably playing a similar role to high-lift devices in fixed-wing aircraft. This paper analyzed and reviewed the results of current research on leading-edge alula, finding some important factors, such as the complex flapping motions, flexibility, and the plane and section shape of the wing, that have been ignored in current research to a certain extent. These would greatly affect the conclusions obtained. Hence, for a deeper understanding of the aerodynamic mechanisms and functions of the alula, some new study predictions for future research are presented. In addition, the feasible models and methods for further research based on these predictions are discussed and proposed. For example, the higher-accuracy LES or hybrid LES/RANS method and the combinations of these methods with wind-tunnel experiments using PIV technology are recommended. |
| first_indexed | 2024-03-10T06:48:43Z |
| format | Article |
| id | doaj.art-e9109ee2b4e74d23b1cfa8d131220ae8 |
| institution | Directory Open Access Journal |
| issn | 2226-4310 |
| language | English |
| last_indexed | 2024-03-10T06:48:43Z |
| publishDate | 2021-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Aerospace |
| spelling | doaj.art-e9109ee2b4e74d23b1cfa8d131220ae82023-11-22T17:03:44ZengMDPI AGAerospace2226-43102021-10-0181029510.3390/aerospace8100295The Progress of Aerodynamic Mechanisms Based on Avian Leading-Edge Alula and Future Study RecommendationsHan Bao0Bifeng Song1Wenqing Yang2Jianlin Xuan3Dong Xue4School of Aeronautics, Northwestern Polytechnical University, Xi’an 710072, ChinaSchool of Aeronautics, Northwestern Polytechnical University, Xi’an 710072, ChinaSchool of Aeronautics, Northwestern Polytechnical University, Xi’an 710072, ChinaSchool of Aeronautics, Northwestern Polytechnical University, Xi’an 710072, ChinaSchool of Aeronautics, Northwestern Polytechnical University, Xi’an 710072, ChinaBirds in nature have many unique devices to help them acquire excellent flight abilities under various complex flight conditions. One of the unique devices is the leading-edge alula, located at the junction of the arm wing and the hand wing of most birds. It often spreads out during takeoff and landing, probably playing a similar role to high-lift devices in fixed-wing aircraft. This paper analyzed and reviewed the results of current research on leading-edge alula, finding some important factors, such as the complex flapping motions, flexibility, and the plane and section shape of the wing, that have been ignored in current research to a certain extent. These would greatly affect the conclusions obtained. Hence, for a deeper understanding of the aerodynamic mechanisms and functions of the alula, some new study predictions for future research are presented. In addition, the feasible models and methods for further research based on these predictions are discussed and proposed. For example, the higher-accuracy LES or hybrid LES/RANS method and the combinations of these methods with wind-tunnel experiments using PIV technology are recommended.https://www.mdpi.com/2226-4310/8/10/295alulaaerodynamicflapping wing |
| spellingShingle | Han Bao Bifeng Song Wenqing Yang Jianlin Xuan Dong Xue The Progress of Aerodynamic Mechanisms Based on Avian Leading-Edge Alula and Future Study Recommendations Aerospace alula aerodynamic flapping wing |
| title | The Progress of Aerodynamic Mechanisms Based on Avian Leading-Edge Alula and Future Study Recommendations |
| title_full | The Progress of Aerodynamic Mechanisms Based on Avian Leading-Edge Alula and Future Study Recommendations |
| title_fullStr | The Progress of Aerodynamic Mechanisms Based on Avian Leading-Edge Alula and Future Study Recommendations |
| title_full_unstemmed | The Progress of Aerodynamic Mechanisms Based on Avian Leading-Edge Alula and Future Study Recommendations |
| title_short | The Progress of Aerodynamic Mechanisms Based on Avian Leading-Edge Alula and Future Study Recommendations |
| title_sort | progress of aerodynamic mechanisms based on avian leading edge alula and future study recommendations |
| topic | alula aerodynamic flapping wing |
| url | https://www.mdpi.com/2226-4310/8/10/295 |
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