Results 251 to 260 of about 3,507,797 (292)
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Interactions of a vortex with an oscillating leading edge
AIAA Journal, 1996This study adresses the detailed structure of the interaction of an incident vortex with a leading edge that is oscillating at the frequency of the incident vortex street. Instantaneous streamline patterns and vorticity distributions allow characterization of the mechanisms of interaction as a function of the timing, or phase shift, of the incident ...
R. W. Jefferies, D. Rockwell
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Multiple Inviscid Solutions for the Flow in a Leading-Edge Vortex
AIAA Journal, 2000To analyze the flowfield inside the vortex formed at the leading edge of a highly swept wing at an angle of attack, conical similarity solutions of the compressible Euler equations have been obtained and compared to incompressible conical similarity flow solutions.
van Noordenburg, M.B.H. +1 more
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Dynamic Stall Control by Leading Edge Vortex Generators
Journal of the American Helicopter Society, 2008A new concept of passive dynamic-stall control was developed and tested on an OA209 rotorcraft airfoil during two wind-tunnel test campains in 2004 and 2005. Small vortex generators are mounted at the leading edge of the rotor blade. At low incidence they are located close to the stagnation point and do not impact the flow field.
Mai, Holger +6 more
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A conceptual study of leading-edge-vortex enhancement by blowing
6th Fluid and PlasmaDynamics Conference, 1973A conceptual wind-tunnel-test program has been conducted to verify that blowing a stream of highpressure air over a swept-wing surface in a direction roughly parallel to the leading edge enhances the vortex system. The blowing is shown to intensify the leading-edge vortex and thus delay the deleterious effects of vortex breakdown to higher angle of ...
R. G. Bradley, W. O. Wray
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A theory for the core of a leading-edge vortex
Journal of Fluid Mechanics, 1961In the flow past a slender delta wing at incidence one can observe a roughly axially symmetric core of spiralling fluid, formed by the rolling-up of the shear layer that separates from a leading edge. The aim in this paper is to predict the flow field within this vortex core, given appropriate conditions at its outside edge.The basic assumptions are (i)
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The compressible inviscid leading-edge vortex
Journal of Fluid Mechanics, 1965The conically symmetric solution of the Eulerian equations of an incompressible fluid obtained by Hall, thought to be descriptive of flow properties in a leading-edge vortex, is generalized to include the effects of compressibility.
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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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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 and shear layer instabilities
36th AIAA Aerospace Sciences Meeting and Exhibit, 1998The stability of a leading edge vortex was studied using available flow visualization and velocity data. The development of a vortex can be envisioned to compose of three possible stages. During the initial stage, the shear layer and its associated vorticity immediately downstream from the apex coalesce to form a primary vortex core.
T. Ng, Doug Oliver
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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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