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Tomographic 3D-PIV and Applications

Elsinga, Gerrit und Wieneke, Bernhard und Scarano, Fulvio und Schröder, Andreas (2006) Tomographic 3D-PIV and Applications. PivNet 2 Final Workshop, 2006-09-07 - 2006-09-08, Göttingen (Germany).

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Kurzfassung

Tomographic PIV is a newly developed 3D (volumetric) flow field measurement technique, which provides the instantaneous 3C-velocity field within a three-dimensional volume. The experimental apparatus is similar to 3D-PTV using typically four cameras recording simultaneously the illuminated volume from different viewing directions. The particle light distribution is back-projected from the views through a tomographic algorithm (MART) and the volume is discretized into into small voxels where the intensity is reconstructed. A 3D-cross-correlation between interrogation volumes of e.g. 48x48x48 voxels evaluates the 3D-vector field. Advanced robust iterative schemes with deformed interrogation volumes have been implemented. The technique has been applied to a flow behind a circular cylinder in air at Re = 2700 and in water for Re = 360 to 2000. The number of computed vectors has been between 100.000 and 300.000 vectors depending on the size of the sensors used for the recording. The measurement precision was estimated at about 0.05 px. Such experiments allowed to directly inspect the three-dimensional structure of cylinder wakes revealing the secondary flow features like pairs of ‘finger’ vortices. A high repetition rate system allows to perform time-resolved 3D-PIV (4D) measurements of a turbulent spot in a laminar boundary layer with a resolution of 0.4 ms showing the development of Q2-events

Dokumentart:Konferenzbeitrag (Vortrag)
Zusätzliche Informationen:37 Folien
Titel:Tomographic 3D-PIV and Applications
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Elsinga, GerritTU-Delft, NL
Wieneke, BernhardLaVision, Göttingen
Scarano, FulvioTU-Delft, NL
Schröder, AndreasNICHT SPEZIFIZIERT
Datum:2006
Referierte Publikation:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Name der Reihe:CD ROM Presentation
Status:veröffentlicht
Stichwörter:Tomographic PIV, 3D-PIV, cylinder wake, turbulent boundary layer
Veranstaltungstitel:PivNet 2 Final Workshop
Veranstaltungsort:Göttingen (Germany)
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2006-09-07 - 2006-09-08
Veranstalter :DLR
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Luftfahrt
HGF - Programmthema:Starrflügler
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AR - Starrflüglerforschung
DLR - Teilgebiet (Projekt, Vorhaben):L - Flugphysik
Standort: Göttingen
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Experimentelle Verfahren
Hinterlegt von: Ilka Micknaus
Hinterlegt am:16 Nov 2006
Letzte Änderung:27 Apr 2009 13:13

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