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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), 26.-29. Jun. 2018, Zürich. DOI: 10.3929/ethz-b-000280170

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

Abstract

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.

Item URL in elib:https://elib.dlr.de/120945/
Document Type:Conference or Workshop Item (Speech)
Title:"Profile-PIV" - More than just an optical hotwire: New potentials of particle image velocimetry in boundary layer research
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Willert, ChristianChris.Willert (at) dlr.dehttps://orcid.org/0000-0002-1668-0181
Date:27 June 2018
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI :10.3929/ethz-b-000280170
Status:Published
Keywords:flow visualization, image-based velocimetry, turbulent boundary layer, validation data, wall shear stress, particle image velocimetry, particle tracking velocimetry, laser diagnostics, turbulence
Event Title:18th International Symposium on Flow Visualization (ISFV2018)
Event Location:Zürich
Event Type:international Conference
Event Dates:26.-29. Jun. 2018
Organizer:ETH Zürich
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:16 Jul 2018 08:57
Last Modified:31 Jul 2019 20:18

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