Skin friction drag reduction over staggered three dimensional cavities

Gowree, Erwin R., Jagadeesh, Chetan and Atkin, Chris ORCID: https://orcid.org/0000-0003-2529-1978 (2019) Skin friction drag reduction over staggered three dimensional cavities. Aerospace Science and Technology, 84. pp. 520-529.

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Abstract

The effect of three-dimensional staggered circular cavities on a zero-pressure gradient incompressible turbulent boundary layer was studied. Two key parameters were varied, being the ratio of the diameter, d, to the depth, h, of the cavity, d/h and the Reynolds number based on the diameter of the cavity, Rd. Velocity profile measurements showed that for the cases of d/h>1 an increase in skin friction drag was experienced with respect to a smooth surface, but for d/h<1 the drag increment was almost negligible and in some cases it was lower than that of a smooth surface by up to 10%. Measurements along the spanwise plane showed the presence of organised transverse velocity components which bear some resemblance with the flow over riblets. The skin friction drag appears to be a strong function of Rd , where for Rd>5500 a drag increment is experienced which could potentially be due to shear layer breakdown and more production of turbulence.

Item Type: Article
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Depositing User: LivePure Connector
Date Deposited: 30 May 2020 00:12
Last Modified: 11 Aug 2022 17:09
URI: https://ueaeprints.uea.ac.uk/id/eprint/75404
DOI: 10.1016/j.ast.2018.11.001

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