The Progress of Aerodynamic Mechanisms Based on Avian Leading-Edge Alula and Future Study Recommendations

被引:7
作者
Bao, Han [1 ,2 ]
Song, Bifeng [1 ,2 ]
Yang, Wenqing [1 ,3 ]
Xuan, Jianlin [1 ,3 ]
Xue, Dong [1 ,2 ]
机构
[1] Northwestern Polytech Univ, Sch Aeronaut, Xian 710072, Peoples R China
[2] Northwestern Polytech Univ, Res & Dev Inst, Shenzhen 518057, Peoples R China
[3] Northwestern Polytech Univ, Yangtze River Delta Res Inst, Taicang 215400, Peoples R China
基金
中国国家自然科学基金;
关键词
alula; aerodynamic; flapping wing; AIRFOIL PROPULSION; LIFT; FLIGHT; VORTEX; FLEXIBILITY; PERFORMANCE; KINEMATICS; EFFICIENCY; AMPLITUDE; VORTICES;
D O I
10.3390/aerospace8100295
中图分类号
V [航空、航天];
学科分类号
08 ; 0825 ;
摘要
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.
引用
收藏
页数:15
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