DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

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), pp. 1-13. Springer Nature. doi: 10.1007/s00348-018-2667-0. ISSN 0723-4864.

Full text not available from this repository.

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


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
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Wolf, C. ChristianUNSPECIFIEDhttps://orcid.org/0000-0002-9052-7548UNSPECIFIED
Gardner, Anthony D.UNSPECIFIEDhttps://orcid.org/0000-0002-1176-3447134929500
Dollinger, ChristophUniversität BremenUNSPECIFIEDUNSPECIFIED
Fischer, AndreasUniversität BremenUNSPECIFIEDUNSPECIFIED
Date:3 January 2019
Journal or Publication Title:Experiments in Fluids
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 1-13
EditorsEmailEditor's ORCID iDORCID Put Code
Publisher:Springer Nature
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 (old)
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:31 Oct 2023 15:15

Repository Staff Only: item control page

Help & Contact
electronic library is running on EPrints 3.3.12
Website and database design: Copyright © German Aerospace Center (DLR). All rights reserved.