Results 231 to 240 of about 189,153 (303)

Vorticity transfer in a leading-edge vortex due to controlled spanwise bending

, 2021
The effect of dynamic spanwise bending on the vortex dynamics of an accelerating flat plate is studied with experiments and numerical simulations. A flat plate, held at an angle of attack of 30 degrees, is accelerated from rest to Reynolds number 2400 ...
Kun Jia, T. Scofield, M. Wei, S. Bhattacharya   +3 more
semanticscholar   +1 more source

Experimental investigation on the leading-edge vortex formation and detachment mechanism of a pitching and plunging plate

Journal of Fluid Mechanics, 2020
The flow topology and leading-edge vortex (LEV) formation and detachment mechanism of a pitching and plunging flat plate are experimentally investigated in this study. Focus is placed on three novel aspects.
Zhenyin Li, Lihao Feng, J. Kissing, C. Tropea, Jinjun Wang   +4 more
semanticscholar   +1 more source

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

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 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

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

Leading-Edge Vortex as a High-Lift Mechanism for Large-Aspect-Ratio Wings

, 2020
Enabling a leading-edge vortex (LEV) is a possible mechanism to significantly increase the lift on wings.
H. Ben-Gida, R. Gurka, D. Weihs
semanticscholar   +1 more source

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