Journal ArticleDOI
Photographic evidence of the formation and growth of vorticity behind plates accelerated from rest in still air
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TLDR
The shedding of vorticity from the edges of a plate, which is accelerated normal to itself from rest in still air, is investigated experimentally by means of a new flow-visualization technique using spark-lighted shadowgraphs and heated air, benzene or other vapours to introduce sufficient changes in density along the surface of discontinuity.Abstract:
The shedding of vorticity from the edges of a plate, which is accelerated normal to itself from rest in still air, is investigated experimentally by means of a new flow-visualization technique using spark-lighted shadowgraphs and heated air, benzene or other vapours to introduce sufficient changes in density along the surface of discontinuity. The photographs show small-scale undulations and the formation of a number of centres of vorticity along the well known big-scale vortex sheets which roll up along their edges.read more
Citations
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On density effects and large structure in turbulent mixing layers
Garry L. Brown,Anatol Roshko +1 more
TL;DR: In this article, Spark shadow pictures and measurements of density fluctuations suggest that turbulent mixing and entrainment is a process of entanglement on the scale of the large structures; some statistical properties of the latter are used to obtain an estimate of entrainedment rates, and large changes of the density ratio across the mixing layer were found to have a relatively small effect on the spreading angle.
Journal ArticleDOI
The transition to turbulence in the wake of a circular cylinder
TL;DR: The position of the region of transition to turbulence and the manner in which turbulence develops are investigated using a hot-wire anemometer to study the character of the flow in the wake of a circular cylinder as mentioned in this paper.
Journal ArticleDOI
The formation of vortex rings
TL;DR: In this paper, the authors classified the generating conditions for vortex rings and classified the conditions under which a given vortex generator produces either an initially laminar ring, which may or may not undergo instability and transition to turbulence, or an initially turbulent ring.
Journal ArticleDOI
The large-scale structure of unsteady self-similar rolled-up vortex sheets
TL;DR: In this article, the roll-up of an initially plane semi-infinite vortex sheet and the starting flow past an infinite wedge with separation at the wedge apex modelled by a growing vortex sheet are considered.
References
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Journal ArticleDOI
A Theory of the Flow Past a Slender Delta Wing with Leading Edge Separation
K. W. Mangler,J. H. B. Smith +1 more
TL;DR: In this article, a potential flow model is constructed, in which the vortex layer is replaced by a vortex sheet of spiral form, and the problem is then reduced to a two-dimensional one by the use of slender-body theory and the assumption of a conical velocity field.
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A theory for the core of a leading-edge vortex
TL;DR: In this article, the authors predict the flow field within a vortex core, given appropriate conditions at its outside edge, assuming that viscous diffusion is confined to a relatively slender subcore and axially symmetric and incompressible.
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A Non-linear Wing Theory and its Application to Rectangular Wings of Small Aspect Ratio
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Ausbildung eines Wirbels an der Kante einer Platte
TL;DR: In this paper, a konforme Abbildung last sich bei gegebener Form and Wirbelbelegung der Unstetigkeitsflachen, die von den Plattenkanten ausgehen.
Journal ArticleDOI
A Theory for Rectangular Wings of Small Aspect Ratio
TL;DR: In this paper, the authors considered the case of a rectangular wing of zero aspect ratio and showed that the inclination of the vortices to the wing is about half the angle of attack.