Skin friction drag reduction over staggered three dimensional cavities

Gowree, Erwin R., Jagadeesh, Chetan and Atkin, Chris (2019) Skin friction drag reduction over staggered three dimensional cavities. Aerospace Science and Technology, 84. pp. 520-529.

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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: 28 Apr 2022 00:33
DOI: 10.1016/j.ast.2018.11.001

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