Research workers have acquired motivation from nature for manufacturing super airfoils quietly which speeds up the aerodynamic performance and also lessens the pollution of noise. Bounding down on their unsuspicious prey, owls can be able to achieve flight near-silent, thanks to the devoted feathers along with a jagged edge. Located on the supreme corner of the wing, these types of serrations are shaped like a comb that influences airflow by deranging high frequency, unstable swirling eddies of air, making them shorter and quieter. In owls, these serrations are considered to be more evolved in the species that are nocturnal like the opposite to diurnal species [daytime].
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Inhibiting pollution of noise in the urban regions is a vital environmental focus for many, and in the engines of turbines [for instance those wind turbines, drones, and airplanes], this is the dragging-edge noise which is the dominant source of sound which is unwanted.
However, a group of ‘Xi’an Jiaotong University in the country of China has also analyzed the unique features of the wings of an owl, for informing the latest design of airfoil for reducing this noise of trailing-edge, in a later study printed in the physics of fluids.
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“Nocturnal owls generate about eighteen decibels less sound than that of the other birds at the exact same flight speeds because of their unique configuration of the wing,” claimed the author named ‘Xiao Min Liu’. Additionally, when the owl snatches prey, the appearance of the wings is also changing constantly, therefore the study of the wing edge configuration while a flight of owl is of great importance.
Via utilizing the example of the airfoil, the layer of air spreading over the lower and upper surface is called as the ‘Boundary Layer’, which is bulky towards the trailing corner. Trailing-corner noise, therefore, is produced when the boundary layer moves along the rear of the airfoil and back through the trailing corner, where it spreads and produces acoustic auditory energy [noise].
