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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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
Faculty \ School:
Related URLs:	https://doi.org/10.1016/j.ast.2018.11.00... https://openaccess.city.ac.uk/id/eprint/...
Depositing User:	LivePure Connector
Date Deposited:	30 May 2020 00:12
Last Modified:	13 May 2021 14:52
URI:	https://ueaeprints.uea.ac.uk/id/eprint/75404
DOI:	10.1016/j.ast.2018.11.001

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