![]() ![]() In addition, the barn owl glides to hunt its prey at 2.5 m/s to 5.0 m/s, which corresponds with the flight Reynolds number range of 30,000 - 90,000 based on the mean chord length of 180 mm. Many studies have been reported that using a serrated design on the leading edge of an aircraft wing reduces aerodynamic noise. The serrated wing of the barn owl is a representative example. Eventually, we obtain the geometric feature of the owl-like airfoil to increase aerodynamic performance at low Reynolds numbers.īiomimetics includes the concepts and principles acquired from nature for application in science and engineering such as in aerodynamic and fluid control devices. The Reynolds number dependency on the lift curves is insignificant, although differences in the drag curves are especially pronounced at high angles of attack. The separation bubble switches location from the pressure side to the suction side as the angle of attack increases and is continuously present on the surface within a wide range of angles of attack. A distinctive flow feature of the owl airfoil is a separation bubble on the pressure side at low angles of attack. The results of the study show that the owl-like airfoil has high lift performance with a nonlinear lift increase due to the presence of a separation bubble on the suction side. Reynolds number dependency on aerodynamics is also evaluated at low Reynolds numbers. This biologically inspired airfoil design is intended to serve as the main-wing for low-Reynolds-number aircrafts such as micro air vehicles. This study experimentally investigates aerodynamic characteristics and flow fields of a smooth owl-like airfoil without serrations and velvet structures. ![]()
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