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Skin friction drag reduction over staggered three dimensional cavities

Gowree, Erwin Ricky and Jagadeesh, Chetan and Atkin, Christopher J. Skin friction drag reduction over staggered three dimensional cavities. (2019) Aerospace Science and Technology, 84. 520-529. ISSN 1270-9638

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Official URL: https://doi.org/10.1016/j.ast.2018.11.001

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/hand the Reynolds number based on the diameter of the cavity,Rd. Velocity profile measurements showed that for the cases of d/h >1an increase in skin friction drag was experienced with respect to a smooth surface, but for d/h ≤1the 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>5500a drag increment is experienced which could potentially be due to shear layer breakdown and more production of turbulence.

Item Type:Article
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
Other partners > University of London (UNITED KINGDOM)
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Deposited By: Erwin Gowree
Deposited On:28 Nov 2018 12:54

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