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Multi-Exposed recordings for 3D Lagrangian particle tracking in turbulent boundary layer flows by means of Multi-Pulse Shake-The-Box

Novara, Matteo and Schanz, Daniel and Geisler, Reinhard and Voß, Christina and Schröder, Andreas (2018) Multi-Exposed recordings for 3D Lagrangian particle tracking in turbulent boundary layer flows by means of Multi-Pulse Shake-The-Box. In: 19th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics (176), pp. 1-16. 19th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics, 16.-19. July 2018, Lissabon, Portugal.

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Official URL: http://www.lisbon-lasersymposium.org/site/programme/?trackid=0&catId=0#!

Abstract

The Shake-The-Box (STB) is a processing algorithm for particle images recorded by means of 3D imaging systems, which enables volumetric Lagrangian particle tracking (LPT) at relatively high seeding densities. The method delivers the accurate measurement of position, velocity and acceleration of individual tracers and, coupled with regularization techniques, provides access to the full velocity gradient tensor. The STB technique, initially proposed for the reconstruction of time-resolved sequences of recordings, has been extended to the case of short recording sequences acquired by multi-pulse systems for the investigation of high-speed flows. The Multi-Pulse Shake-TheBox technique (MP-STB) exploits an iterative strategy to make up for the lack of time-resolved recordings and progressively simplify the reconstruction and tracking problem, therefore increasing the number of successfully identified particle tracks. Several strategies can be adopted to acquire multi-pulse recordings suitable for MP-STB; typically, a dual imaging system is used with the aim of separating the particle images from subsequent laser pulses onto individual camera frames. In the present study the use of multi-exposed recordings is proposed which employs a single imaging system, largely reducing the complexity of the experimental setup at the cost of an increase in the perceived seeding density. The MP-STB technique is applied here to experimental results from the investigation of boundary layer flows in air at speeds ranging from 15 to 35 m/s; results, presented in terms of instantaneous tracks and flow structures, suggest the suitability of the proposed multi-exposed strategy for carrying out 3D Lagrangian particle tracking with MP-STB in high-speed flows.

Item URL in elib:https://elib.dlr.de/122306/
Document Type:Conference or Workshop Item (Speech)
Title:Multi-Exposed recordings for 3D Lagrangian particle tracking in turbulent boundary layer flows by means of Multi-Pulse Shake-The-Box
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Novara, Matteomatteo.novara (at) dlr.deUNSPECIFIED
Schanz, Danieldaniel.schanz (at) dlr.deUNSPECIFIED
Geisler, Reinhardreinhard.geisler (at) dlr.deUNSPECIFIED
Voß, Christinachristina.voss (at) dlr.deUNSPECIFIED
Schröder, Andreasandreas.schroeder (at) dlr.dehttps://orcid.org/0000-0002-6971-9262
Date:2018
Journal or Publication Title:19th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-16
Series Name:Conference proceedings online
Status:Published
Keywords:Lagrangian, 3D particle tracking, multi-pulse, Shake-The-Box, boundary layers
Event Title:19th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics
Event Location:Lissabon, Portugal
Event Type:international Conference
Event Dates:16.-19. July 2018
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 - VicToria
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Experimental Methods, GO
Institute for Aerodynamics and Flow Technology > High Speed Configurations, GO
Deposited By: Micknaus, Ilka
Deposited On:10 Jan 2019 13:03
Last Modified:14 Jun 2019 13:40

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