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"Profile-PIV" - More than just an optical hotwire: New potentials of particle image velocimetry in boundary layer research

Willert, Christian (2018) "Profile-PIV" - More than just an optical hotwire: New potentials of particle image velocimetry in boundary layer research. 18th International Symposium on Flow Visualization (ISFV2018), 2018-06-26 - 2018-06-29, Zürich. doi: 10.3929/ethz-b-000280170.

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Offizielle URL: https://doi.org/10.3929/ethz-b-000280170

Kurzfassung

The ISFV Asanuma Award lecture was held by the author during the 18th International Symposium of Flow Visualization held in Zurich, Switzerland, in June 2018. It provided an overview of the development, implementation and application of a recently developed variant of the particle image velocimetry (PIV) technique. The so-called "profile-PIV" approach utilizes high aspect ratio image formats to capture velocity data along narrow strips rather than providing the nearly square flow maps characteristic of PIV. Using a high-speed camera, the smaller image format allows the image capture at frame rates up to and beyond 100 kHz such that converged velocity statistics become feasible when using sample counts of similar magnitude. The narrow field of view permits a proportional reduction of the laser power required for particle illumination. For medium speed air flows (U < 10 m/s) a CW laser is suitable, whereas pulsed diode lasers are required at higher velocities. When operated with high image magnification near 1:1, the technique provides access to near-wall velocity statistics of boundary layer flows, in particular, to recover the mean and unsteady wall shear stress, even at higher shear Reynolds numbers, provided the viscous scales can still be resolved by the imager's pixels. The potential of the "profile-PIV" technique is demonstrated with examples from a variety of recent applications is given, mainly in the area of turbulent boundary layer investigation.

elib-URL des Eintrags:https://elib.dlr.de/120945/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:"Profile-PIV" - More than just an optical hotwire: New potentials of particle image velocimetry in boundary layer research
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Willert, ChristianChris.Willert (at) dlr.dehttps://orcid.org/0000-0002-1668-0181NICHT SPEZIFIZIERT
Datum:27 Juni 2018
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
DOI:10.3929/ethz-b-000280170
Status:veröffentlicht
Stichwörter:flow visualization, image-based velocimetry, turbulent boundary layer, validation data, wall shear stress, particle image velocimetry, particle tracking velocimetry, laser diagnostics, turbulence
Veranstaltungstitel:18th International Symposium on Flow Visualization (ISFV2018)
Veranstaltungsort:Zürich
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:26 Juni 2018
Veranstaltungsende:29 Juni 2018
Veranstalter :ETH Zürich
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Antriebssysteme
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L ER - Engine Research
DLR - Teilgebiet (Projekt, Vorhaben):L - Virtuelles Triebwerk und Validierungsmethoden (alt)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Antriebstechnik > Triebwerksmesstechnik
Hinterlegt von: Willert, Dr.phil. Christian
Hinterlegt am:16 Jul 2018 08:57
Letzte Änderung:24 Apr 2024 20:25

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