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Advanced Infrared Thermography Data Analysis for Unsteady Boundary Layer Transition Detection

Mertens, Christoph and Wolf, C. Christian and Gardner, Anthony D. and Schrijer, F.F.J. and van Oudheusden, B. W. (2020) Advanced Infrared Thermography Data Analysis for Unsteady Boundary Layer Transition Detection. Measurement Science & Technology, 31 (1), pp. 1-13. Institute of Physics (IOP) Publishing. doi: 10.1088/1361-6501/ab3ae2. ISSN 0957-0233.

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Official URL: https://iopscience.iop.org/article/10.1088/1361-6501/ab3ae2


Advanced data processing methods for detecting unsteady boundary layer transition in periodic aerodynamic processes by means of infrared thermography measurements are presented. The thermal radiation emitted from the heated suction surface of a pitching airfoil model in subsonic flow is measured with an infrared camera. The unsteady boundary layer transition location is detected by analyzing the difference in the infrared radiation signal over short periods of time with differential infrared thermography (DIT). The DIT method is optimized and automated in the present study, which facilitates the extension of the part of the motion period where valid DIT transition measurements are produced. Additionally, a new infrared thermography data processing method is introduced in this study. The extraction of the extrema of the measured radiation signal at fixed locations on the model surface yields instants of the motion period that relate to the occurrence of boundary layer transition. The local infrared thermography (LIT) approach can be extended to measuring the twodimensional unsteady boundary layer transition front.

Item URL in elib:https://elib.dlr.de/129796/
Document Type:Article
Additional Information:Print: https://iopscience.iop.org/journal/0957-0233
Title:Advanced Infrared Thermography Data Analysis for Unsteady Boundary Layer Transition Detection
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/0000-0002-1176-3447UNSPECIFIED
van Oudheusden, B. W.Faculty of Aerospace Engineering, Delft University of Technology, Delft, The NetherlandsUNSPECIFIEDUNSPECIFIED
Date:January 2020
Journal or Publication Title:Measurement Science & Technology
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:Institute of Physics (IOP) Publishing
Keywords:unsteady aerodynamics, boundary layer transition, wind tunnel testing, pitching airfoil model, infrared thermography, data analysis
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: Carter, Beatrice
Deposited On:29 Oct 2019 15:09
Last Modified:24 Oct 2023 11:30

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