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Application of particle image velocimetry for velocity measurements in subsonic near-wall shear flows

Sorokin, A.M. und Boiko, A.V und Dovgal, A.V. und Gorev, V.N. und Hein, Stefan und Wilke, Bastian (2010) Application of particle image velocimetry for velocity measurements in subsonic near-wall shear flows. International Conference on the Methods of Aerophysical Research – ICMAR 2010, 01. - 06. Nov. 2010, Novosibirsk, Russia. ISBN 978-5-98901-085-1.

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Kurzfassung

Particle Image Velocimetry (PIV) is widely used in experimental studies on fluid mechanics making it possible to observe panoramic instantaneous velocity distributions. In the present work we consider application of PIV for investigation of the flow details in boundary layers with respect to two particular topics. The first of them is determination of the local skin friction coefficient of turbulent boundary layer. To this end, measurements of the linear part of the mean-velocity profile in the viscous sublayer can be used in non-equilibrium flows. Meanwhile, hot-wire anemometry is not appropriate in this case due to the cooling effect of the neighbouring wall on the hot-wire readings. For PIV measurements in the sublayer, a sophisticated technique is usually needed including the use of long distance microscopes, special calibration procedures, seeding particles and software. The second point is reliability of PIV in experiments on laminar-turbulent transition in shear layers. Normally, the method provides a sufficient resolution of rather strong velocity variations. Also, during transition to turbulence, it was found as a suitable technique to observe velocity perturbations as low as ~ 10–2 of the free stream velocity, e.g.. In the present paper we are interested in potential application of PIV for investigation of much weaker laminar-flow disturbances found at the early stage of transition to turbulence.

Dokumentart:Konferenzbeitrag (Vortrag, Paper)
Titel:Application of particle image velocimetry for velocity measurements in subsonic near-wall shear flows
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Sorokin, A.M.Khristianovich Institute of Theoretical and Applied Mechanics, Novosibirsk
Boiko, A.VKhristianovich Institute of Theoretical and Applied Mechanics, Novosibirsk
Dovgal, A.V.Khristianovich Institute of Theoretical and Applied Mechanics, Novosibirsk
Gorev, V.N.Khristianovich Institute of Theoretical and Applied Mechanics, Novosibirsk
Hein, StefanNICHT SPEZIFIZIERT
Wilke, BastianNICHT SPEZIFIZIERT
Datum:2010
Referierte Publikation:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Seitenbereich:Seiten 1-7
Name der Reihe:Conference Proceedings on CD-ROM
ISBN:978-5-98901-085-1
Status:veröffentlicht
Stichwörter:particle image velocimetry (PIV), skin friction, turbulent flat-plate boundary layer, laminar-turbulent transition, backward-facing step, separation bubble
Veranstaltungstitel:International Conference on the Methods of Aerophysical Research – ICMAR 2010
Veranstaltungsort:Novosibirsk, Russia
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:01. - 06. Nov. 2010
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
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 > Hubschrauber
Institut für Aerodynamik und Strömungstechnik > Hochgeschwindigkeitskonfigurationen
Hinterlegt von: Dr.-Ing. Stefan Hein
Hinterlegt am:28 Feb 2012 14:41
Letzte Änderung:28 Feb 2012 14:41

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