Results 271 to 280 of about 92,148 (309)
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NEW TWISTS IN THE LEADING-EDGE VORTEX
Journal of Experimental Biology, 2004![Figure][1] Insects aren't airplanes. If they flew like airplanes, they would fall right out of the sky because their wings are much too small. But since they flap their wings, they can generate a `leading-edge vortex', a rotating element of fluid along the front of the wing ...
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Leading-edge vortex development on a pitching flat plate with multiple leading edge geometries
Experimental Thermal and Fluid Science, 2018Abstract This article investigates the dynamic stall of a pitching flat plate in order to facilitate lift control in applications such as flapping wings and micro-aerial vehicles. Constant-pitch-rate rotation, similar to ramp-and-hold, of a flat plate was investigated in an open-jet wind tunnel using embedded surface pressure sensors to assess vortex
Leknys, R. +3 more
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Three-Dimensional Substructure in a Leading Edge Vortex
41st AIAA Fluid Dynamics Conference and Exhibit, 2011High pitch rate manoeuvres have been studied in great depth in recent decades, in respect to rotor dynamic stall and, more recently, in understanding bird and insect flight with view to application in biomimetic micro air vehicles (MAVs). The flow topology arising from such unsteady airfoil movement is complex.
Abel-John Buchner +2 more
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Unsteady behavior of spiral leading-edge vortex breakdown
21st Atmospheric Flight Mechanics Conference, 1996Unsteady characteristics of the leading-edge vortex breakdown on a 65-deg delta wing are investigated. Emphasis is placed on the longitudinal motion of the breakdown region and its spiral structure under static as well as dynamic conditions as they have an important impact on vehicle flight mechanics and may cause aeroelastic problems. The onset of the
X. Huang, E. Hanff
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On leading edge vortex and its control
16th Atmospheric Flight Mechanics Conference, 1989A simple model for the leading edge vortex and a postulation for the existence of a critical vorticity concentration above which a stable leading edge vortex cannot be maintained were proposed. Using the model and postulation, various aspects of vortex control by blowing were discussed.
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Control of leading edge vortex breakdown by blowing
26th Aerospace Sciences Meeting, 1988An investigation into the effects of using a jet of air to control the vortex breakdown position on a 70 degree delta wing is presented. The specific objectives focused on optimizing the blowing positions in terms of maximum lift increments obtained for minimum blowing rates.
K. VISSER, K. IWANSKI, R. NELSON, T. NG
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Computation and visualization of leading edge vortex flows
Computing Systems in Engineering, 1990The modeling of vortical flows is a continuing requirement for the design and analysis of flight vehicles. In this paper, the computation of leading edge vortices is considered. The solution of the laminar, thin-layer Navier-Stokes equations for a transonic delta wing is presented as a representative example. Issues relating to the visualization of the
E.M. Murman, T.M. Becker, D. Darmofal
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Leading Edge Vortex Formation on Finite Wings Using Vortex Particles
AIAA Scitech 2021 Forum, 2021Hugh J. Bird +3 more
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Slender Wings with Leading Edge Vortex-Separation
1982The demands of high speed performance and maneuverability on modern transport- and fighter-aircraft require slender wings, whose leading edge vortex flows result in increased lift at high angle-of-attack. Beginning with the experimental and theoretical development and the history of application the article will discuss the application of panel- and ...
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Instabilities in Leading-Edge Vortex Development
5th Applied Aerodynamics Conference, 1987G.A. REYNOLDS, A.A. ABTAHI
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