Results 241 to 250 of about 3,507,797 (292)

Lift and the Leading Edge Vortex

50th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, 2012
AbstractFlapping wings often feature a leading-edge vortex (LEV) that is thought to enhance the lift generated by the wing. Here the lift on a wing featuring a leading-edge vortex is considered by performing experiments on a translating flat-plate aerofoil that is accelerated from rest in a water towing tank at a fixed angle of attack of 15°.
Pitt Ford, C. W., Babinsky, H.
openaire   +2 more sources

Leading-Edge Vortex Lifts Swifts

Science, 2004
The current understanding of how birds fly must be revised, because birds use their hand-wings in an unconventional way to generate lift and drag. Physical models of a common swift wing in gliding posture with a 60° sweep of the sharp hand-wing leading edge were tested in a water tunnel.
Videler, J. J., Stamhuis, E. J., Povel, G. D. E.   +2 more
openaire   +2 more sources

Vortex–leading-edge interaction

Journal of Fluid Mechanics, 1982
Visualization of successive vortices impinging upon the leading edge of a wedge reveals patterns of deformation of each incident vortex; for certain offsets of the edge with respect to the incident vortex there is pronounced vortex shedding from the leading edge, whereby the shed vortex has a vorticity orientation opposite to that of the incident ...
Samir Ziada, Donald Rockwell
openaire   +1 more source

Leading-edge vortex stability in insect wings

Physical Review E, 2005
An analytical study is presented to determine if the persistency of the leading-edge vortex in an insect wing can be explained as the balance between vorticity generation at the leading edge and advection plus effects of vorticity stretching and tilting by the flow along the wing span.
F O, Minotti, E, Speranza
openaire   +2 more sources

Leading-Edge-Vortex Augmentation in Compressible Flow

Journal of Aircraft, 1975
Leading-edge-vortex enhancement by blowing has been explored experimentally. Conceptual half-span windtunnel tests were conducted on a wing-body-tail configuration with a cambered and twisted wing with leadingedge flaps. Blowing vortex augmentation is shown to be effective in improving both lift and drag due to lift at high angle of attack for the Mach
R. BRADLEY, P. WHITTEN, W. WRAY
openaire   +1 more source

Control of Leading-Edge Vortex Breakdown by Trailing Edge Injection

Journal of Aircraft, 1999
The goal of this research is the control of the vortex breakdown locations over sharp-edged, slender, delta wings at high angles of attack. Water tunnel tests of a 75-deg delta wing examined symmetric and asymmetric trailing-edge jet injection as a method to control and delay the leading-edge vortex breakdown locations. These tests were accomplished at
Anthony Mitchell, Pascal Molton, Didier Barberis, Jean Delery   +3 more
openaire   +1 more source

Entrainment effect of a leading-edge vortex

AIAA Journal, 1987
Etude experimentale des caracteristiques de l'ecoulement dans un tourbillon de bord d'attaque.
N. G. Verhaagen, A.C.H. Kruisbrink
openaire   +1 more source

A multi‐vortex model of leading‐edge vortex flows

International Journal for Numerical Methods in Fluids, 1983
AbstractA multi‐vortex model of the vortex sheets shed from the sharp leading edges of slender wings is considered. The method, which is developed within the framework of slender‐body theory, is designed to deal with those situations in which more than one centre of rotation is formed on the wing, for example on a slender wing with lengthwise camber or
openaire   +2 more sources

Simulation of leading-edge vortex flows

Theoretical and Computational Fluid Dynamics, 1990
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Hsu, C.-H., Liu, C. H.
openaire   +1 more source

Modeling of leading edge vortex burst

AIAA Atmospheric Flight Mechanics Conference and Exhibit, 2001
The burst of leading edge vortex (LEV) is investigated by a modified quasi-cylindrical approximation (MQCA) for the sub-core of the vortex. By assembling LEV with the MQCA and evaluating the total pressure drop along the sub-core of LEV, a model for predicting the location of LEV burst is proposed.
Haiye Lou, X. Huang
openaire   +1 more source