Influence of turbulence on the drag of solid discs and turbine simulators in a water current
Influence of turbulence on the drag of solid discs and turbine simulators in a water current
Laboratory experiments have been used to investigate the effects of turbulence on the drag of both solid discs and porous disc turbine simulators. These discs were introduced to turbulent flows, in a gravity-fed water flume, with various levels of turbulence intensity and integral length scales. The turbulence was generated using three different grid configurations, which produced intensities and scales comparable with previous wind tunnel studies. The drag measurements were taken with discs of two different diameters and porosities with and without the upstream grids. The experimental results have demonstrated that the drag coefficients, of all the discs tested, are significantly dependent on both the turbulence intensity and integral length scale. For small integral length scales, relative to the disc, the drag coefficients converged for turbulence intensities greater than 13 %, with an increase of around 20 % in drag coefficient over the low-intensity case. Experiments with turbulence intensities of 10 % demonstrated minimum drag coefficients when the integral length scale-to-disc diameter ratio was around 50 %. Significant variations in the drag coefficient of circular bluff bodies are therefore expected when operating in turbulent flows with different characteristics
1637-1637
Blackmore, Tom
8fbdca2a-a8b4-4ea5-9fc9-51dcbfdbc152
Batten, William M.J.
2d2d395e-76af-4cf5-9ccd-e1cc55b31388
Műller, Gerald U.
f1a988fc-3bde-429e-83e2-041e9792bfd9
Bahaj, AbuBakr S.
f40a7c32-0b85-4f11-931a-32ea2f1bf924
January 2014
Blackmore, Tom
8fbdca2a-a8b4-4ea5-9fc9-51dcbfdbc152
Batten, William M.J.
2d2d395e-76af-4cf5-9ccd-e1cc55b31388
Műller, Gerald U.
f1a988fc-3bde-429e-83e2-041e9792bfd9
Bahaj, AbuBakr S.
f40a7c32-0b85-4f11-931a-32ea2f1bf924
Blackmore, Tom, Batten, William M.J. and Műller, Gerald U. et al.
(2014)
Influence of turbulence on the drag of solid discs and turbine simulators in a water current.
Experiments in Fluids, 55 (1), .
(doi:10.1007/s00348-013-1637-9).
Abstract
Laboratory experiments have been used to investigate the effects of turbulence on the drag of both solid discs and porous disc turbine simulators. These discs were introduced to turbulent flows, in a gravity-fed water flume, with various levels of turbulence intensity and integral length scales. The turbulence was generated using three different grid configurations, which produced intensities and scales comparable with previous wind tunnel studies. The drag measurements were taken with discs of two different diameters and porosities with and without the upstream grids. The experimental results have demonstrated that the drag coefficients, of all the discs tested, are significantly dependent on both the turbulence intensity and integral length scale. For small integral length scales, relative to the disc, the drag coefficients converged for turbulence intensities greater than 13 %, with an increase of around 20 % in drag coefficient over the low-intensity case. Experiments with turbulence intensities of 10 % demonstrated minimum drag coefficients when the integral length scale-to-disc diameter ratio was around 50 %. Significant variations in the drag coefficient of circular bluff bodies are therefore expected when operating in turbulent flows with different characteristics
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Accepted/In Press date: 18 November 2013
e-pub ahead of print date: December 2013
Published date: January 2014
Organisations:
Water & Environmental Engineering Group
Identifiers
Local EPrints ID: 381694
URI: http://eprints.soton.ac.uk/id/eprint/381694
ISSN: 0723-4864
PURE UUID: 85e541fa-33c1-4415-91af-5c5288bd29e1
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Date deposited: 09 Oct 2015 14:39
Last modified: 14 Mar 2024 21:19
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Author:
Tom Blackmore
Author:
William M.J. Batten
Author:
AbuBakr S. Bahaj
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