The Influence of Leading Edge Serrations on The Flow Field of an Artificial Owl Wing

Klän, Stephan; Klaas, Michael; Schröder, Wolfgang

doi:10.2514/6.2010-4942

Cited by 20 publications

(20 citation statements)

References 11 publications

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“…In contrast with other results [47][48][49], no change in aerodynamic performance was observed by these authors. Furthermore, at high angles of attack (248), Geyer et al [51] observed a reduction of 5 dB in gliding-flight noise in one of two barn owl wings tested.…”

Section: Serrationscontrasting

confidence: 55%

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Features of owl wings that promote silent flight

et al. 2017

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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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Section: Serrationscontrasting

confidence: 55%

“…Klän et al [47,48] and Winzen et al [49] have studied the effect of serrations on the aerodynamic behaviour of model and natural owl wings. These authors fitted a wing model with a geometry reflecting the wing shape of a barn owl with different types of serrations, e.g.…”

Section: Serrationsmentioning

confidence: 99%

Features of owl wings that promote silent flight

et al. 2017

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“…The mean chord of the whale flipper is approximately 0.51 m [25]. Based on the sea water viscosity and density at 16°C, the operational Reynolds number is estimated to be approximately 1.1 Â 10 6 Hansen [55]. Thus it can be said that tubercles offer performance benefits mainly noticeable in the transitional region.…”

Section: Humpback Whalementioning

confidence: 99%

“…Some of the most fascinating biomimicking studies, from the aerodynamic perspective, include the flight of owls and seagulls [3][4][5][6][7][8]. Owls have the ability to approach their prey in total silence, and the flapping sound is damped by leading edge serrations, giving them the ability to control the flow [5][6][7].…”

Section: Biomimeticsmentioning

confidence: 99%

Mimicking the humpback whale: An aerodynamic perspective

Aftab

Razak

Rafie

et al. 2016

Progress in Aerospace Sciences

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“…Recently, Klän et al [40,41] studied the impact of leading-edge serrations on the flow field of a 3D airfoil model, which was derived from natural barn owl wings, through the use of advanced measurement equipment. They found that the influence of leading-edge serrations on the flow field strongly depended on the flow conditions such as the angle of attack and Reynolds number, and spanwise position also influenced the effectiveness of the serrations.…”

Section: Flying Birdsmentioning

confidence: 99%

Bio-Inspired Aerodynamic Noise Control: A Bibliographic Review

Wang

Zhao

et al. 2019

Applied Sciences

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It is well-known that many species of owl have the unique ability to fly silently, which can be attributed to their distinctive and special feather adaptations. Inspired by the owls, researchers attempted to reduce the aerodynamic noise of aircraft and other structures by learning their noise reduction features from different viewpoints and then using the gained knowledge to develop a number of innovative noise reduction solutions. Although fruitful results have been achieved in the bio-inspired aerodynamic noise control, as far as the authors know, comparatively little work has been done to summarize the main findings and progresses in this area. In this bibliographic survey, we systematically review the progresses and trends of the bio-inspired aerodynamic noise control, including the macroscopic and microscopic morphological characteristics of the owl wing feathers, the noise measurements on both flying birds in the field and prepared wings in the wind tunnel, as well as theoretical, numerical and experimental studies that explored the feasibility, parameter influence, aerodynamic effects and underlying mechanisms of the four main bio-inspired noise reduction techniques, i.e., leading edge serrations, trailing edge serrations, fringe-type trailing edge extensions and porous material inspired noise reduction. Finally, we also give some suggestions for future work.

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The Influence of Leading Edge Serrations on The Flow Field of an Artificial Owl Wing

Cited by 20 publications

References 11 publications

Features of owl wings that promote silent flight

Features of owl wings that promote silent flight

Mimicking the humpback whale: An aerodynamic perspective

Bio-Inspired Aerodynamic Noise Control: A Bibliographic Review

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