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Skin-friction measurements in a turbulent boundary layer under the influence of free-stream turbulence

Skin-friction measurements in a turbulent boundary layer under the influence of free-stream turbulence
Skin-friction measurements in a turbulent boundary layer under the influence of free-stream turbulence
This experimental investigation deals with the influence of free-stream turbulence (FST) produced by an active grid on the skin-friction of a zero-pressure- gradient turbulent boundary layer. Wall shear stress is obtained by oil-film interferometry (OFI). Additionally, hot-wire anemometry was performed to obtain wall-normal profiles of streamwise velocity. This enables the skin-friction to be deduced from the mean profile. Both methods show remarkable agreement for every test case. Although skin friction is shown to increase with FST; the trend with Reynolds number is found to be similar to cases without FST. Furthermore, once the change in the friction velocity is accounted for, the self-similarity of the logarithmic region and below (i.e. law of the wall) appears to hold for all FST cases investigated.
OFI, free-stream turbulence, turbulent boundary layer
0723-4864
Blay Esteban, Luis
cbfef12f-f6c3-460f-b614-c347c0291351
Dogan, Eda
deb7b97e-7985-4d5b-98a7-d68852713207
Rodriguez-Lopez, Eduardo
0aef9cc6-1abf-48b6-bafb-e20201b44d6a
Ganapathisubramani, Bharathram
5e69099f-2f39-4fdd-8a85-3ac906827052
Blay Esteban, Luis
cbfef12f-f6c3-460f-b614-c347c0291351
Dogan, Eda
deb7b97e-7985-4d5b-98a7-d68852713207
Rodriguez-Lopez, Eduardo
0aef9cc6-1abf-48b6-bafb-e20201b44d6a
Ganapathisubramani, Bharathram
5e69099f-2f39-4fdd-8a85-3ac906827052

Blay Esteban, Luis, Dogan, Eda, Rodriguez-Lopez, Eduardo and Ganapathisubramani, Bharathram (2017) Skin-friction measurements in a turbulent boundary layer under the influence of free-stream turbulence. Experiments in Fluids, 58 (115). (doi:10.1007/s00348-017-2397-8).

Record type: Article

Abstract

This experimental investigation deals with the influence of free-stream turbulence (FST) produced by an active grid on the skin-friction of a zero-pressure- gradient turbulent boundary layer. Wall shear stress is obtained by oil-film interferometry (OFI). Additionally, hot-wire anemometry was performed to obtain wall-normal profiles of streamwise velocity. This enables the skin-friction to be deduced from the mean profile. Both methods show remarkable agreement for every test case. Although skin friction is shown to increase with FST; the trend with Reynolds number is found to be similar to cases without FST. Furthermore, once the change in the friction velocity is accounted for, the self-similarity of the logarithmic region and below (i.e. law of the wall) appears to hold for all FST cases investigated.

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BlayEsteban_et_al_EXIF-D-17-00221R1 - Accepted Manuscript
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More information

Accepted/In Press date: 8 July 2017
e-pub ahead of print date: 2 August 2017
Published date: September 2017
Keywords: OFI, free-stream turbulence, turbulent boundary layer

Identifiers

Local EPrints ID: 412629
URI: https://eprints.soton.ac.uk/id/eprint/412629
ISSN: 0723-4864
PURE UUID: 225b4d81-0cbf-4bfb-8df8-ea6ef420541b
ORCID for Eduardo Rodriguez-Lopez: ORCID iD orcid.org/0000-0003-3927-8811
ORCID for Bharathram Ganapathisubramani: ORCID iD orcid.org/0000-0001-9817-0486

Catalogue record

Date deposited: 24 Jul 2017 16:32
Last modified: 15 Aug 2019 04:45

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