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Vortex shedding from tapered, triangular plates: taper and aspect ratio effects

Vortex shedding from tapered, triangular plates: taper and aspect ratio effects
Vortex shedding from tapered, triangular plates: taper and aspect ratio effects
Further experiments on features of the vortex shedding from tapered flat plates normal to an airstream are described. The work extends that of Castro and Rogers (2002) and concentrates on the study of the effects of varying the spanwise aspect ratio for a fixed shape plate, by appropriate adjustment of end-plates, and of the nature of the shedding as the degree of taper becomes very large, so that the body is more like a triangular plate—e.g. an isosceles triangle—than a slightly tapered plate. With the taper ratio TR defined as the ratio of plate length to average cross-stream width, the paper concentrates on the range 0.58<TR<60. Reynolds numbers, based on the average plate width, exceed 104. It is confirmed that for a small enough taper ratio the geometrical three-dimensionality is sufficiently strong that all signs of periodic vortex shedding cease. For all other cases, however, the flow at different locations along the span can vary substantially, depending on taper. There appear to be at least four different regimes, each appropriate for a different range of taper ratio. These various regimes are described.
0723-4864
159-167
Castro, Ian P.
66e6330d-d93a-439a-a69b-e061e660de61
Watson, Lee
34fdd0fb-a4bf-4c95-86d4-8fc6aa27203b
Castro, Ian P.
66e6330d-d93a-439a-a69b-e061e660de61
Watson, Lee
34fdd0fb-a4bf-4c95-86d4-8fc6aa27203b

Castro, Ian P. and Watson, Lee (2004) Vortex shedding from tapered, triangular plates: taper and aspect ratio effects. Experiments in Fluids, 37 (2), 159-167. (doi:10.1007/s00348-004-0795-1).

Record type: Article

Abstract

Further experiments on features of the vortex shedding from tapered flat plates normal to an airstream are described. The work extends that of Castro and Rogers (2002) and concentrates on the study of the effects of varying the spanwise aspect ratio for a fixed shape plate, by appropriate adjustment of end-plates, and of the nature of the shedding as the degree of taper becomes very large, so that the body is more like a triangular plate—e.g. an isosceles triangle—than a slightly tapered plate. With the taper ratio TR defined as the ratio of plate length to average cross-stream width, the paper concentrates on the range 0.58<TR<60. Reynolds numbers, based on the average plate width, exceed 104. It is confirmed that for a small enough taper ratio the geometrical three-dimensionality is sufficiently strong that all signs of periodic vortex shedding cease. For all other cases, however, the flow at different locations along the span can vary substantially, depending on taper. There appear to be at least four different regimes, each appropriate for a different range of taper ratio. These various regimes are described.

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Published date: 2004

Identifiers

Local EPrints ID: 22892
URI: https://eprints.soton.ac.uk/id/eprint/22892
ISSN: 0723-4864
PURE UUID: b8ab33dc-2632-4a42-b252-625bca63ca83

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Date deposited: 23 Mar 2006
Last modified: 17 Jul 2017 16:20

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