Results 211 to 220 of about 11,934 (259)
Lift Enhancement of a Stationary Wing in a Wake
AIAA Journal, 2020 A stationary wing placed in the wake of a bluff body experiences lift enhancement. The quasi-periodic flow in the wake causes excitation of the separated flow in the poststall conditions.
Ismet Gursul
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Lift-enhancing tabs on swept, three-dimensional high-lift systems
14th Applied Aerodynamics Conference, 1996A three-dimensional high-lift system was computationally simulated to investigate the effectiveness of lift-enhancing tabs on swept wings. The computations were performed by solving the incompressible Navier-Stokes equations on structured, overset grids, and the effects of turbulence were simulated using the one-equation Baldwin-Barth model.
Donovan L. Mathias +2 more
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Covert-inspired flaps for lift enhancement and stall mitigation
Bioinspiration & Biomimetics, 2021Even though unmanned aerial vehicles (UAVs) are taking on more expansive roles in military and commercial applications, their adaptability and agility are still inferior to that of their biological counterparts like birds, especially at low and moderate Reynolds numbers.
Chengfang Duan, Aimy Wissa
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Random Roughness Enhances Lift in Supersonic Flow
Physical Review Letters, 2007We study the scattering of shock waves by a rough wedge using second-order perturbation analysis and stochastic simulations employed synergistically to cover a large range in correlation length A and amplitude epsilon of the profile roughness (with length d).
Guang, Lin +2 more
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To lift or recut: Changing trends in LASIK enhancement
Journal of Cataract and Refractive Surgery, 2003To report serious complications caused by recutting laser in situ keratomileusis (LASIK) flaps for enhancement and reconsider the current preferred method of LASIK enhancement.Multiple surgeon practices.This retrospective noncomparative nonconsecutive case series comprised LASIK patients in the private practices of 9 experienced refractive surgeons and
Roy S, Rubinfeld +8 more
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The mechanisms of lift enhancement in insect flight
Naturwissenschaften, 2004Recent studies have revealed a diverse array of fluid dynamic phenomena that enhance lift production during flapping insect flight. Physical and analytical models of oscillating wings have demonstrated that a prominent vortex attached to the wing's leading edge augments lift production throughout the translational parts of the stroke cycle, whereas ...
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Dry eye after LASIK enhancement by flap lifting
American Journal of Ophthalmology, 2006ABSTRACT PURPOSE: To determine whether dry eye after LASIK recurs after LASIK enhancement. METHODS: A total of 63 eyes of 42 patients who underwent LASIK enhancement were included in this study. Subjective dry eye symptoms, tear break-up time (BUT), Schirmer test with anesthesia, fluorescein staining of the cornea, and corneal ...
Ikuko, Toda +3 more
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Lift enhancement by an externally trapped vortex
10th Fluid and Plasmadynamics Conference, 1977A theoretical study is made of the performance capabilities of a lift concept that utilizes a spanwise vortex over the upper surface of the wing. The vortex is generated by a vertical flap near the leading edge of the wing and maintained by suction through orifices in endplates at the wingtip.
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Gurney flap—Lift enhancement, mechanisms and applications
Progress in Aerospace Sciences, 2008Abstract Since its invention by a race car driver Dan Gurney in 1960s, the Gurney flap has been used to enhance the aerodynamics performance of subsonic and supercritical airfoils, high-lift devices and delta wings. In order to take stock of recent research and development of Gurney flap, we have carried out a review of the characteristics and ...
Kwing-So Choi
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