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Large-scale volumetric characterization of a turbulent boundary layer flow

Schanz, Daniel and Schröder, Andreas and Novara, Matteo and Geisler, Reinhard and Agocs, Janos and Eich, Felix and Bross, Matthew and Kähler, Christian J. (2019) Large-scale volumetric characterization of a turbulent boundary layer flow. In: Proceedings of the 13th International Symposium on Particle Image Velocimetry (182), 251 - 265. Universität der Bundeswehr München: AtheneForschung. 13th International Symposium on Particle Image Velocimetry – ISPIV 2019, 22. - 24. July 2019, Munich, Germany.

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Official URL: https://athene-forschung.unibw.de/128737?sortfield0=authors&sortfield1=&show_id=129151

Abstract

We report on an experimental undertaking with the goal of detecting so-called turbulent superstructures within a turbulent boundary layer and describing their temporal development while propagating from a region of zero pressure gradient (ZPG) into a region of adverse pressure gradient (APG). The flow was characterized by performing Lagrangian Particle Tracking (LPT) of Helium-filled soap bubbles (HFSBs) using the Shake-The-Box (STB, Schanz et al. 2016) algorithm. This work will present first results, but will concentrate on the description of the experimental efforts and the evaluation approaches that were necessary to successfully conduct this investigation. The tracking of a large number of tracer particles (several 100,000) within an extensive volume (nearly three meters in length) was made possible by the use of a system consisting of 12 cameras, forming three successive volumetric systems. Calibration and evaluation methods for fusing the different systems into one large camera system are described. Challenges in calibrating camera systems with a large field-of-view due to small-scale distortion effects introduced by the observation windows are discussed and correction methods are introduced. Methods for achieving a perfect transition between overlapping camera systems are introduced. For higher flow velocities, a double illumination approach was created in order to limit the pixel displacement between frames. To the knowledge of the authors, this is the first time such an approach was realized for time-resolved image sequences.

Item URL in elib:https://elib.dlr.de/130725/
Document Type:Conference or Workshop Item (Speech)
Additional Information:Session: 1.3 A 3D Applications, https://athene-forschung.unibw.de/doc/129117/129117.pdf, Paper Nr. 129151 Open-Access-Publikation
Title:Large-scale volumetric characterization of a turbulent boundary layer flow
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schanz, Danieldaniel.schanz (at) dlr.deUNSPECIFIED
Schröder, Andreasandreas.schroeder (at) dlr.dehttps://orcid.org/0000-0002-6971-9262
Novara, Matteomatteo.novara (at) dlr.deUNSPECIFIED
Geisler, Reinhardreinhard.geisler (at) dlr.deUNSPECIFIED
Agocs, Janosjanos.agocs (at) dlr.deUNSPECIFIED
Eich, FelixUniversität der BundeswehrUNSPECIFIED
Bross, MatthewUniversität der BundeswehrUNSPECIFIED
Kähler, Christian J.Universität der BundeswehrUNSPECIFIED
Date:July 2019
Journal or Publication Title:Proceedings of the 13th International Symposium on Particle Image Velocimetry
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:251 - 265
Editors:
EditorsEmail
Kähler, Christian JoachimUniBW München
Hain, RainerUniBW München
Scharnowski, SvenUniBW München
Fuchs, ThomasUniBW München
Publisher:Universität der Bundeswehr München: AtheneForschung
Series Name:Conference Proceedings online
Status:Published
Keywords:Shake-The-Box, Lagrangian Particle Tracking, turbulent boundary layer
Event Title:13th International Symposium on Particle Image Velocimetry – ISPIV 2019
Event Location:Munich, Germany
Event Type:international Conference
Event Dates:22. - 24. July 2019
Organizer:Universität der Bundeswehr München, Germany
Institution:Deutsches Zentrum für Luft- und Raumfahrt e.V.
Department:AS-EXV
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation and Validation
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Experimental Methods, GO
Deposited By: Micknaus, Ilka
Deposited On:22 Nov 2019 14:41
Last Modified:22 Nov 2019 15:09

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