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

Sorokin, A.M. and Boiko, A.V and Dovgal, A.V. and Gorev, V.N. and Hein, Stefan and 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.

Full text not available from this repository.

Abstract

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.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Application of particle image velocimetry for velocity measurements in subsonic near-wall shear flows
Authors:
AuthorsInstitution or Email of Authors
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, StefanUNSPECIFIED
Wilke, BastianUNSPECIFIED
Date:2010
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-7
Series Name:Conference Proceedings on CD-ROM
ISBN:978-5-98901-085-1
Status:Published
Keywords:particle image velocimetry (PIV), skin friction, turbulent flat-plate boundary layer, laminar-turbulent transition, backward-facing step, separation bubble
Event Title:International Conference on the Methods of Aerophysical Research – ICMAR 2010
Event Location:Novosibirsk, Russia
Event Type:international Conference
Event Dates:01. - 06. Nov. 2010
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Institute of Aerodynamics and Flow Technology > High Speed Configurations
Deposited By: Dr.-Ing. Stefan Hein
Deposited On:28 Feb 2012 14:41
Last Modified:28 Feb 2012 14:41

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