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Optimization of differential infrared thermography for unsteady boundary layer transition measurement

Wolf, C. Christian and Mertens, Christoph and Gardner, Anthony D. and Dollinger, Christoph and Fischer, Andreas (2019) Optimization of differential infrared thermography for unsteady boundary layer transition measurement. Experiments in Fluids, 60:19. Springer. DOI: 10.1007/s00348-018-2667-0 ISSN 0723-4864

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Official URL: https://doi.org/10.1007/s00348-018-2667-0

Abstract

Differential infrared thermography (DIT) is a method of analyzing infrared images to measure the unsteady motion of the laminar-turbulent transition of a boundary layer. It uses the subtraction of two infrared images taken with a short-time delay. DIT is a new technique which already demonstrated its validity in applications related to the unsteady aerodynamics of helicopter rotors in forward flight. The current study investigates a pitch-oscillating airfoil and proposes several optimizations of the original concept. These include the extension of DIT to steady test cases, a temperature compensation for long-term measurements, and a discussion of the proper infrared image separation distance. The current results also provide a deeper insight into the working principles of the technique. The results compare well to reference data acquired by unsteady pressure transducers, but at least for the current setup DIT results in an additional measurement-related lag for relevant pitching frequencies.

Item URL in elib:https://elib.dlr.de/125669/
Document Type:Article
Title:Optimization of differential infrared thermography for unsteady boundary layer transition measurement
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Wolf, C. ChristianChristian.Wolf (at) dlr.dehttps://orcid.org/0000-0002-9052-7548
Mertens, ChristophTU DelftUNSPECIFIED
Gardner, Anthony D.anthony.gardner (at) dlr.dehttps://orcid.org/0000-0002-1176-3447
Dollinger, ChristophUniversität BremenUNSPECIFIED
Fischer, AndreasUniversität BremenUNSPECIFIED
Date:3 January 2019
Journal or Publication Title:Experiments in Fluids
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:60:19
DOI :10.1007/s00348-018-2667-0
Publisher:Springer
ISSN:0723-4864
Status:Published
Keywords:boundary layer transition, infrared measurements, differential infrared thermography (DIT)
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:rotorcraft
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research
DLR - Research theme (Project):L - The Virtual Aerodynamic Rotorcraft
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Helicopter, GO
Deposited By: Winkels, Elisabeth
Deposited On:09 Jan 2019 07:52
Last Modified:06 Sep 2019 15:25

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