Causal mechanisms in airfoil-circulation formation – ScienceOpen
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      Causal mechanisms in airfoil-circulation formation

      1 , 2 , 1 , 1 , 1 , 3
      Physics of Fluids
      AIP Publishing

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          Most cited references28

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          Boundary-Layer Theory

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            Leading-edge vortex improves lift in slow-flying bats.

            Staying aloft when hovering and flying slowly is demanding. According to quasi-steady-state aerodynamic theory, slow-flying vertebrates should not be able to generate enough lift to remain aloft. Therefore, unsteady aerodynamic mechanisms to enhance lift production have been proposed. Using digital particle image velocimetry, we showed that a small nectar-feeding bat is able to increase lift by as much as 40% using attached leading-edge vortices (LEVs) during slow forward flight, resulting in a maximum lift coefficient of 4.8. The airflow passing over the LEV reattaches behind the LEV smoothly to the wing, despite the exceptionally large local angles of attack and wing camber. Our results show that the use of unsteady aerodynamic mechanisms in flapping flight is not limited to insects but is also used by larger and heavier animals.
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              The vortex-shedding process behind two-dimensional bluff bodies

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                Author and article information

                Journal
                Physics of Fluids
                Physics of Fluids
                AIP Publishing
                1070-6631
                1089-7666
                December 2015
                December 2015
                : 27
                : 12
                : 123601
                Affiliations
                [1 ]State Key Laboratory for Turbulence and Complex Systems, College of Engineering, Peking University, Beijing 100871, China
                [2 ]Department of Mechanical and Aerospace Engineering, Western Michigan University, Kalamazoo, Michigan 49008, USA
                [3 ]The University of Tennessee Space Institute, Tullahoma, Tennessee 37388, USA
                Article
                10.1063/1.4937348
                f181445a-8a2a-4a1a-95bb-e92df08d72e8
                © 2015
                History

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