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Direct measurement of skin friction using TSP data

Miozzi, Massimo and Capone, Alessandro and Costantini, Marco and Fratto, Lorenzo and Klein, Christian and Di Felice, Fabio (2018) Direct measurement of skin friction using TSP data. In: 5th International Conference on Experimental Fluid Mechanics, pp. 339-344. Institute of Fluid Mechanics and Aerodynamics, Universität der Bundeswehr München, Germany. 5th International Conference on Experimental Fluid Mechanics, ICEFM, 02.-04. Juli 2018, München, Germany. DOI: 10.18726/2018_2 ISBN 978-3-943207-32-3

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Official URL: https://athene-forschung.unibw.de/doc/124421/124421.pdf

Abstract

In this work, the focus is on the skin-friction data derived from time histories of temperature maps obtained using Temperature Sensitive Paint (TSP). These maps retain a detailed portrait of the footprints of the coherent flow structures close to the surface, under the hypothesis that the wall heat flux is mainly due to the convective action of the flow. We hypothesize that the temperature fluctuations, measured at the wall by means of TSP, can be used as tracers, so that the passage of the same event at close (but well separated) locations can be captured. A criterion to diagnose the streamwise profile of the time-averaged friction velocity is proposed as follows. Firstly, the best correlation distance (time lag) is identified between temperature time-histories acquired simultaneously at adjacent, streamwise aligned, locations. Under the hypothesis of strong locality of the heat fluxes between surface and fluid, the friction velocity is then estimated as the ratio between the streamwise distance of the two locations and the identified time lag. The proposed criterion is applied to the flow which develops on the surface of a NACA 0015 hydrofoil investigated at a Reynolds number of 180000 and angles of attack from 3° to 10°. The experiments were carried out in the cavitation tunnel CEIMM at CNR-INSEAN (Rome).

Item URL in elib:https://elib.dlr.de/121776/
Document Type:Conference or Workshop Item (Speech)
Additional Information:https://athene-orschung.unibw.de/doc/124421/124421.pdf Link für Conference Proceedings
Title:Direct measurement of skin friction using TSP data
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Miozzi, Massimomassimo.miozzi (at) cnr.itUNSPECIFIED
Capone, Alessandroalessandro.capone (at) uniud.itUNSPECIFIED
Costantini, MarcoMarco.Costantini (at) dlr.dehttps://orcid.org/0000-0003-0642-0199
Fratto, Lorenzofrattolorenzo (at) gmail.comUNSPECIFIED
Klein, Christianchristian.klein (at) dlr.dehttps://orcid.org/0000-0001-7592-6922
Di Felice, Fabiofabio.difelice (at) cnr.itUNSPECIFIED
Date:2 July 2018
Journal or Publication Title:5th International Conference on Experimental Fluid Mechanics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI :10.18726/2018_2
Page Range:pp. 339-344
Editors:
EditorsEmail
Kähler, Christian J.UniBW München
Hain, RainerUNSPECIFIED
Scharnowski, SvenUNSPECIFIED
Fuchs, ThomasUNSPECIFIED
Publisher:Institute of Fluid Mechanics and Aerodynamics, Universität der Bundeswehr München, Germany
Series Name:Conference Proceedings online
ISBN:978-3-943207-32-3
Status:Published
Keywords:Temperature-Sensitive Paint, Skin Friction, Laminar Separation Bubble
Event Title:5th International Conference on Experimental Fluid Mechanics, ICEFM
Event Location:München, Germany
Event Type:international Conference
Event Dates:02.-04. Juli 2018
Organizer:Universität der Bundeswehr München
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation and Validation
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Experimental Methods, GO
Deposited By: Micknaus, Ilka
Deposited On:11 Jan 2019 04:51
Last Modified:11 Jan 2019 04:54

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