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Recent applications of near-wall, high-speed PIV for near-wall boundary layer characterization

Willert, Christian and Klinner, Joachim (2017) Recent applications of near-wall, high-speed PIV for near-wall boundary layer characterization. New Challenges in Wall Turbulence, 14.-16. Juni 2017, Villeneuve D'Ascq (Lille), Frankreich.

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Abstract

The contribution will introduce a PIV implementation that combines high-magnification imaging, high-speed image capture and large samples counts in order to acquire long records of temporally coherent velocity data. For the investigation of turbulent boundary layers (TBL), the wall-normal velocity profile is captured using a narrow light sheet and reduced (narrow) camera field-of-view, such that sample counts beyond O(10E5) at sampling frequencies >10 kHz can be achieved. The PIV technique has been applied successfully in two recent EuHIT-funded projects that were performed respectively at the LML wind tunnel in May 2015 for the measurement of an adverse pressure gradient TBL and at the CICLoPE facility of Univ. Bologna in May 2016 for the measurement of fully turbulent pipe flow up to Re_\tau = 40,000. For both applications, details on implementation, sample results and lessons-learned will be presented. Ongoing developments are focussed on pushing the technique beyond 100 kHz using the latest generation of high-speed cameras and manufacturing-grade laser systems.

Item URL in elib:https://elib.dlr.de/116909/
Document Type:Conference or Workshop Item (Speech)
Title:Recent applications of near-wall, high-speed PIV for near-wall boundary layer characterization
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Willert, ChristianChris.Willert (at) dlr.dehttps://orcid.org/0000-0002-1668-0181
Klinner, JoachimJoachim.Klinner (at) dlr.dehttps://orcid.org/0000-0003-2709-9664
Date:June 2017
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:turbulent boundary layer, particle image velocimetry, PIV
Event Title:New Challenges in Wall Turbulence
Event Location:Villeneuve D'Ascq (Lille), Frankreich
Event Type:Workshop
Event Dates:14.-16. Juni 2017
Organizer:Ecole Centrale de Lille
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Virtual Engine and Validation methods
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Engine Measurement Systems
Deposited By: Willert, Dr.phil. Christian
Deposited On:14 Dec 2017 09:59
Last Modified:31 Jul 2019 20:14

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