Aerodynamic performance improvement by divergent trailing edge modification to a supercritical airfoil

2001 ◽  
Vol 15 (10) ◽  
pp. 1434-1441 ◽  
Author(s):  
Neung-Soo Yoo
Keyword(s):  
Performance Improvement ◽  
Aerodynamic Performance ◽  
Trailing Edge ◽  
Supercritical Airfoil ◽  
Edge Modification

Geometry and Aerodynamic Performance of Parabolic Trailing-Edge Flaps

2018 ◽  
Author(s):  
Douglas F. Hunsaker ◽  
Jackson T. Reid ◽  
Bruno Moorthamers ◽  
James J. Joo
Keyword(s):  
Aerodynamic Performance ◽  
Trailing Edge ◽  
Trailing Edge Flaps

scholarly journals Features of owl wings that promote silent flight

2017 ◽  
Vol 7 (1) ◽  
pp. 20160078 ◽  
Author(s):  
Hermann Wagner ◽  
Matthias Weger ◽  
Michael Klaas ◽  
Wolfgang Schröder
Keyword(s):  
Noise Reduction ◽  
Leading Edge ◽  
Aerodynamic Performance ◽  
Wing Loading ◽  
Trailing Edge ◽  
Future Directions ◽  
Trailing Edge Noise ◽  
Aerodynamic Properties ◽  
Morphological Adaptations ◽  
Noise Production

Owls are an order of birds of prey that are known for the development of a silent flight. We review here the morphological adaptations of owls leading to silent flight and discuss also aerodynamic properties of owl wings. We start with early observations (until 2005), and then turn to recent advances. The large wings of these birds, resulting in low wing loading and a low aspect ratio, contribute to noise reduction by allowing slow flight. The serrations on the leading edge of the wing and the velvet-like surface have an effect on noise reduction and also lead to an improvement of aerodynamic performance. The fringes at the inner feather vanes reduce noise by gliding into the grooves at the lower wing surface that are formed by barb shafts. The fringed trailing edge of the wing has been shown to reduce trailing edge noise. These adaptations to silent flight have been an inspiration for biologists and engineers for the development of devices with reduced noise production. Today several biomimetic applications such as a serrated pantograph or a fringed ventilator are available. Finally, we discuss unresolved questions and possible future directions.

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