Journal ArticleDOI
Flowfield Produced by a Vortex Ring Near a Plane Wall
TLDR
In this paper, an experimental study on the flow field produced by a vortex ring approaching a plane wall perpendicular to its axis of symmetry, using smoke visualization technique, was carried out.Abstract:
Experimental studies were carried out on the flowfield produced by a vortex ring approaching a plane wall perpendicular to its axis of symmetry, using smoke visualization technique. The mechanism of rebound of a vortex ring from the wall is shown to be related to generation of a shear layer separated from the wall and its subsequent development. The effects of Reynolds numbers on the trajectory of the core center of a vortex ring were also examined. Growth of the separated shear layer and generation of the secondary vortex ring due to vorticity concentration in the separated shear layer were visualized in detail.read more
Citations
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An experimental study of a vortex ring interacting with an inclined wall
TL;DR: In this paper, an experimental study has been made on the interaction of a vortex ring with a plane solid boundary which is inclined to the axis of the ring, which revealed the formation of bi-helical vortex lines around the circumferential axis.
Journal ArticleDOI
A note on the cause of rebound in the head-on collision of a vortex ring with a wall
TL;DR: In this article, flow visualization studies of the collision of a vortex ring with a wall are compared with those of the head-on collision of two identical rings, designed to mimic the inviscid, free-slip case of a ring/wall interaction.
Journal ArticleDOI
Compressible Vortex-Ring Interaction Studies with a Number of Generic Body Configurations
TL;DR: In this paper, an experimental study has been conducted to examine compressible vortex ring structure and propagation, and the interaction of vortex ring with generic-body configurations using high-speed schlieren photography.
Journal ArticleDOI
Coaxial axisymmetric vortex rings: 150 years after Helmholtz
TL;DR: In this paper, the history of the classical Helmholtz paper that laid the foundation of the vortex dynamics is discussed, with a special section on circular vortex filaments and axisymmetric vortex rings.
Journal ArticleDOI
Experimental investigation of vortex rings impinging on inclined surfaces
TL;DR: In this paper, a mechanical piston-cylinder vortex ring generator at jet Reynolds numbers 2,000-4,000 and stroke length to piston diameter ratios (L/D) in the range 0.75-2.0 was used to generate secondary vorticity at the plate and its subsequent ejection into the fluid.
References
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Journal ArticleDOI
Flowfield produced by trailing vortices in the vicinity of the ground
John K. Harvey,F. J. Perry +1 more
Journal ArticleDOI
The instability of the thin vortex ring of constant vorticity
Sheila E. Widnall,Chon-Yin Tsai +1 more
TL;DR: In this paper, a theoretical study indicates that vortex rings at moderate Reynolds numbers are unstable to azimuthal bending waves, and the stability analysis is developed for a certain class of bending waves that are unstable on a line filament in the presence of strain.
Journal ArticleDOI
The Potential of an Anchor Ring. Part II
TL;DR: In this article, the potential of an anchor ring was found at all external points; in this/its value is determined at internal points; here the stability of such a ring is considered.
Journal ArticleDOI
The motion of two-dimensional vortex pairs in a ground effect
Steven J. Barker,Steven C. Crow +1 more
TL;DR: In this paper, a two-dimensional line vortices are generated in a water tank of dimensions 15 × 122 × 244 cm and their axes span the 15 cm width of the tank, and the flow is visualized using fluorescein dye.
Journal ArticleDOI
The approach of a vortex pair to a plane surface in inviscid fluid
TL;DR: In this article, it was shown that a symmetrical vortex pair consisting of equal and opposite vortices approaching a plane wall at right angles must approach the monotonically in the absence of viscous effects.