Print Email Facebook Twitter Advanced Infrared Thermography Data Analysis for Unsteady Boundary Layer Transition Detection Title Advanced Infrared Thermography Data Analysis for Unsteady Boundary Layer Transition Detection Author Mertens, C. (TU Delft Aerodynamics; Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)) Wolf, C. Christian (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)) Gardner, Anthony D. (Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)) Schrijer, F.F.J. (TU Delft Aerodynamics) van Oudheusden, B.W. (TU Delft Aerodynamics) Date 2020 Abstract 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 two-dimensional unsteady boundary layer transition front. Subject unsteady aerodynamicsboundary layer transitionwind tunnel testingpitching airfoil modelinfrared thermographydata analysis To reference this document use: http://resolver.tudelft.nl/uuid:15ce2150-8cf6-4383-b21d-7346298853ff DOI https://doi.org/10.1088/1361-6501/ab3ae2 Embargo date 2020-07-01 ISSN 0957-0233 Source Measurement Science and Technology, 31 (1) Bibliographical note Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type journal article Rights © 2020 C. Mertens, C. Christian Wolf, Anthony D. Gardner, F.F.J. Schrijer, B.W. van Oudheusden Files PDF Mertens_2020_Meas._Sci._T ... 015301.pdf 1.9 MB Close viewer /islandora/object/uuid:15ce2150-8cf6-4383-b21d-7346298853ff/datastream/OBJ/view