An analysis of silent flight of owl

Abstract

The present research studies the various parameters such as its special feather materials, the serrated wings feather, long velvet down materials causing the nearly silent flight of an Owl (Barn Owl). An Owl is a bird that is quite common and is well known for its nearly silent flight. The owl contains the long velvet down feathers found on wings and legs absorb the sound frequencies. The elongated distal barbules of the Owl form a multi-layer grid porous structure which also has a positive effect on the sound absorption quality of the Owl. The leading edge serration and trailing edge fringe improves the pressure fluctuation of turbulence boundary, distribute the air rushing and accumulation of air at the end of the wing which suppress the generation of vortex sound and also solves the problem of fluttering in the wings. The owls can perform this phenomenon even at great heights because of their aerodynamically designed wings and feathers. Silent flight gives Owl ability to capture prey by stealth. The main focus and Interest of this paper is to concentrate on the silent flight of Owl and built a basic of a bionic air foil, which is extracted from the Owl wings... This research not only can give the inspiration for solving the aerodynamic noise of aircraft and engineering machine, but also can provide a new idea for the design of low-noise devices Inspired by the noise absorption structure of Owl wings. The results may be further used to build an Unmanned Air Vehicle (UAV), capable of silent flight like Owls.