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Taylor hypothesis applied to direct measurement of skin friction using data from Temperature Sensitive Paint

Miozzi, Massimo and Di Felice, Fabio and Klein, Christian and Costantini, Marco (2019) Taylor hypothesis applied to direct measurement of skin friction using data from Temperature Sensitive Paint. Experimental Thermal and Fluid Science, 110 (109913), pp. 1-11. Elsevier. DOI: 10.1016/j.expthermflusci.2019.109913 ISSN 0894-1777

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Official URL: https://www.journals.elsevier.com/experimental-thermal-and-fluid-science/special-issues

Abstract

We report about the feasibility of two criteria for the direct measurement of the skin friction which ground on the investigation of the passive transport of temperature fluctuations, as obtained from Temperature-Sensitive Paint (TSP) data. To this aim, the relationships between the propagation velocity of the temperature disturbances at the wall beneath a turbulent boundary layer and the friction velocity is firstly assessed from literature as a common rule of these reverse strategies. The first criterion represents a proof-of-concept of the reliability of the use of the passive transport of temperature fluctuations for the estimation of the friction velocity. It relies on the identification of the time lag corresponding to the correlation peak between temperature time histories taken at points separated by fixed streamwise distance from the investigated location. The second criterion is derived by minimizing the deviation from the Taylor hypothesis of the equation of transport of temperature fluctuations (energy equation for incompressible flows at investigated conditions). Starting from these theoretical basis, the focus is placed on the flow around the suction side of a NACA 0015 hydrofoil model and on the Laminar Separation Bubble beneath, investigated experimentally at chord Reynolds number Re = 180000 and angles of attack AoA = [1°; 3°; 5°; 7°; 10°]. The time- and spanwise-averaged propagation velocity of the temperature disturbances and friction coefficient are proposed and criticized. Averaged maps of the same quantities are then reported and commented as well.

Item URL in elib:https://elib.dlr.de/129578/
Document Type:Article
Additional Information:Available online: 11 September 2019
Title:Taylor hypothesis applied to direct measurement of skin friction using data from Temperature Sensitive Paint
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Miozzi, Massimomassimo.miozzi (at) cnr.ithttps://orcid.org/0000-0002-6733-078X
Di Felice, Fabiofabio.difelice (at) cnr.itUNSPECIFIED
Klein, Christianchristian.klein (at) dlr.dehttps://orcid.org/0000-0001-7592-6922
Costantini, Marcomarco.costantini (at) dlr.dehttps://orcid.org/0000-0003-0642-0199
Date:11 September 2019
Journal or Publication Title:Experimental Thermal and Fluid Science
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:110
DOI :10.1016/j.expthermflusci.2019.109913
Page Range:pp. 1-11
Editors:
EditorsEmailEditor's ORCID iD
UNSPECIFIEDElsevier Inc.UNSPECIFIED
Publisher:Elsevier
Series Name:Special Issue dedicated to the 5th International Conference on Experimental Fluid Mechanics (ICEFM)
ISSN:0894-1777
Status:Published
Keywords:Skin Friction, Temperature-Sensitive Paint, Taylor Hypothesis, Laminar Separation Bubble
Institution:Deutsches Zentrum für Luft- und Raumfahrt e.V.
Department:AS-EXV
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 - VicToria
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Experimental Methods, GO
Deposited By: Micknaus, Ilka
Deposited On:15 Oct 2019 12:04
Last Modified:16 Apr 2020 13:33

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