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Unsteady Boundary Layer Transition Detection with Local Infrared Thermography (Vollbeitrag)

Mertens, Christoph and Wolf, Christian and Gardner, Anthony (2020) Unsteady Boundary Layer Transition Detection with Local Infrared Thermography (Vollbeitrag). In: 21st STAB/DGLR Symposium on New Results in Numerical and Experimental Fluid Mechanics, 142, pp. 382-391. Springer Nature. 21. STAB/DGLR Symposium 2018, 6.-7. Nov. 2018, Darmstadt. doi: 10.1007/978-3-030-25253-3_37. ISBN 978-3-030-25252-6. ISSN 1612-2909.

Full text not available from this repository.

Official URL: https://doi.org/10.1007/978-3-030-25253-3_37


A new approach to measuring unsteady boundary layer transition in periodic processes with infrared thermography is introduced. The radiation from the heated suction surface of a pitching airfoil model is measured with an infrared camera. The extraction of the extrema of the measured radiation signal at fixed model locations yields instants of the motion phase that correlate with the occurrence of boundary layer transition. The analysis of the extrema of the signal's gradient produces results that are equivalent to the results acquired by optimized differential infrared thermography, and it provides insight into the origins of the systematic error of that technique. It is demonstrated that the local infrared thermography approach can be readily extended to measuring two-dimensional boundary layer transition fronts.

Item URL in elib:https://elib.dlr.de/120744/
Document Type:Conference or Workshop Item (Speech)
Additional Information:Print ISBN 978-3-030-25252-6 Online ISBN 978-3-030-25253-3 ISSN-electronic 1860-0824
Title:Unsteady Boundary Layer Transition Detection with Local Infrared Thermography (Vollbeitrag)
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Mertens, ChristophChristoph.Mertens (at) dlr.deUNSPECIFIED
Wolf, ChristianChristian.Wolf (at) dlr.dehttps://orcid.org/0000-0002-9052-7548
Gardner, Anthonyanthony.gardner (at) dlr.dehttps://orcid.org/0000-0002-1176-3447
Journal or Publication Title:21st STAB/DGLR Symposium on New Results in Numerical and Experimental Fluid Mechanics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
DOI :10.1007/978-3-030-25253-3_37
Page Range:pp. 382-391
EditorsEmailEditor's ORCID iD
Dillmann, Andreasandreas.dillmann@dlr.deUNSPECIFIED
Heller, GerdAirbus BremenUNSPECIFIED
Krämer, EwaldInstitut für Aerodynamik und Gasdynamik Universität StuttgartUNSPECIFIED
Wagner, ClausClaus.Wagner@DLR.deUNSPECIFIED
Tropea, CameronFachgebiet Strömungslehre und Aerodynamik, TU DarmstadtUNSPECIFIED
Jakirlic, SuadTU DarmstadtUNSPECIFIED
Publisher:Springer Nature
Series Name:Notes on Numerical Fluid Mechanics and Multidisciplinary Design
Keywords:boundary layer, transition, LIT, Infrared thermography, unsteady flow, periodic flow
Event Title:21. STAB/DGLR Symposium 2018
Event Location:Darmstadt
Event Type:international Conference
Event Dates:6.-7. Nov. 2018
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:15 Nov 2018 12:17
Last Modified:18 Jun 2020 09:39

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