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.
Original language | English |
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Pages (from-to) | 520-529 |
Number of pages | 10 |
Journal | Aerospace Science and Technology |
Volume | 84 |
Early online date | 6 Nov 2018 |
DOIs | |
Publication status | Published - Jan 2019 |
Profiles
-
Chris Atkin
- School of Engineering, Mathematics and Physics - Professor of Engineering and Head of Engineering
- Fluids & Structures - Member
- Sustainable Energy - Member
Person: Research Group Member, Academic, Teaching & Research