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New PIV-based techniques for turbulence research

Kähler, Ch. (1998) New PIV-based techniques for turbulence research. Department of Mechanical Engineering, University of California, Berkeley/USA, 25. November 1998.

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Abstract

Particle Image Velocimetry (PIV) has become a widely used technique for investigations into fluid flows were the spatial distribution of the velocity helps to understand the physics of flow. However, quiet often other quantities are desirable to answer fluid-mechanical questions. Time resolved PIV measurements in air flows as well as the simultaneous determination of all three velocity components in spatially separated planes for example are desriable for many fluid-mechanical investigations. In order to measure these quantities a multiple plane stereo PIV system has been developed. The multiple plane stereo PIV system consists of a four pulse laser system delivering orthogonally polarized light, two pairs of high resolution progressive scan CCD cameras in an angular imaging configuration with Scheimpflug correction for stereo-scopic recording, two high reflectivity mirrors and a pair of polarizing beam-splitter cubes. This technique is very reliable, robust and well suited for all kinds research, purely scientific as well as for industrially motivated investigations in large wind tunnel. Instantaneous quantities as the vorticity or the invariants of the velocity gradient tensor and time-dependent quantities as space-time correlations or the acceleration can be obtained to characterize the spatial and temporal flow unsteadiness. In order to study the accuracy and reliability of the Multiple Plane Stereo system the transition to turbulence in a flat plate boundary layer flow with zero pressure gradient has been examined

Document Type:Conference or Workshop Item (Speech)
Additional Information: LIDO-Berichtsjahr=1999,
Title:New PIV-based techniques for turbulence research
Authors:
AuthorsInstitution or Email of Authors
Kähler, Ch.UNSPECIFIED
Date:1998
Status:Published
Keywords:Stereoscopic PIV, Multiple Plane PIV, Multiple Plane Stereo PIV, four pulse laser system, progressive scan CCD cameras
Event Title:Department of Mechanical Engineering, University of California, Berkeley/USA, 25. November 1998
Organizer:Department of Mechanical Engineering, University of California
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L ST - Starrflüglertechnologien
DLR - Research theme (Project):UNSPECIFIED
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Institut für Strömungsmechanik
Deposited By: elib DLR-Beauftragter
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 20:33

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