Experiments on vortex shedding from a blunt trailing edge symmetric hydrofoil operating at zero angle of attack in a uniform high speed flow, , where the reference length is the trailing edge thickness, are reported. The effects of a tripped turbulent boundary layer on the wake characteristics are analyzed and compared with the condition of a natural turbulent transition. The foil surface is hydraulically smooth and a fully effective boundary layer tripping at the leading edge is achieved with the help of a distributed roughness. The vortex shedding process is found to be strongly influenced by the boundary layer development: the tripped turbulent transition promotes the re-establishment of organized vortex shedding. In the context of the tripped transition and in comparison with the natural one, significant increases in the vortex span-wise organization, the vortex-induced hydrofoil vibration, the wake velocity fluctuations, and the vortex strength are revealed. Although the vortex shedding frequency is decreased, a modified Strouhal number based on the wake width at the end of the vortex formation region is constant and evidences the similarity of the wakes in terms of spatial distribution for the two considered boundary layer transition processes.
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Fundamental Issues And Canonical Flows
The Effects of a Tripped Turbulent Boundary Layer on Vortex Shedding from a Blunt Trailing Edge Hydrofoil
Philippe Ausoni
,
Philippe Ausoni
ABREMA Agence Brevets et Marques, Avenue du Théâtre 16, P.O. Box 5027,CH-1002 Lausanne,
Switzerland
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Amirreza Zobeiri
,
Amirreza Zobeiri
Ecole Polytechnique Fédérale de Lausanne, Laboratory for Hydraulic Machines, Avenue Cour 33bis, CH-1007 Lausanne,
Switzerland
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François Avellan
,
François Avellan
Ecole Polytechnique Fédérale de Lausanne, Laboratory for Hydraulic Machines, Avenue Cour 33bis, CH-1007 Lausanne,
Switzerland
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Mohamed Farhat
Mohamed Farhat
Ecole Polytechnique Fédérale de Lausanne, Laboratory for Hydraulic Machines, Avenue Cour 33bis, CH-1007 Lausanne,
Switzerland
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Philippe Ausoni
ABREMA Agence Brevets et Marques, Avenue du Théâtre 16, P.O. Box 5027,CH-1002 Lausanne,
Switzerland
Amirreza Zobeiri
Ecole Polytechnique Fédérale de Lausanne, Laboratory for Hydraulic Machines, Avenue Cour 33bis, CH-1007 Lausanne,
Switzerland
François Avellan
Ecole Polytechnique Fédérale de Lausanne, Laboratory for Hydraulic Machines, Avenue Cour 33bis, CH-1007 Lausanne,
Switzerland
Mohamed Farhat
Ecole Polytechnique Fédérale de Lausanne, Laboratory for Hydraulic Machines, Avenue Cour 33bis, CH-1007 Lausanne,
Switzerland
J. Fluids Eng. May 2012, 134(5): 051207 (11 pages)
Published Online: May 22, 2012
Article history
Received:
July 17, 2011
Revised:
March 23, 2012
Published:
May 18, 2012
Online:
May 22, 2012
Citation
Ausoni, P., Zobeiri, A., Avellan, F., and Farhat, M. (May 22, 2012). "The Effects of a Tripped Turbulent Boundary Layer on Vortex Shedding from a Blunt Trailing Edge Hydrofoil." ASME. J. Fluids Eng. May 2012; 134(5): 051207. https://doi.org/10.1115/1.4006700
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