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Flow structures in a tripped turbulent boundary layer flow An investigation using time-resolved tomographic PIV

Schröder, Andreas and Geisler, Reinhard and Michaelis, Dirk (2007) Flow structures in a tripped turbulent boundary layer flow An investigation using time-resolved tomographic PIV. 7th International Symposium on Particle Image Velocimetry, 2007-09-11 - 2007-09-14, Roma, Italy.

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Abstract

The spatial and temporal development of turbulent boundary layer flows is governed by the self-organization of coherent structures like hairpin-like or arch vortices and spanwise alternating wall bounded low- and highspeed streaks. For a detailed analysis of the topologies of the wall normal fluid exchange namely of the four quadrants of the “instantaneous” Reynolds stresses Q1,…,Q4 a time-resolved 3D-3C measurement technique is desired. In this feasibility study the tomographic PIV technique (Elsinga et al. 2005, PIV ‘05) has been applied to time resolved PIV recordings. Four high speed CMOS cameras are imaging tracer particles which were illuminated in a volume inside a boundary layer flow at 4 kHz by using two high repetitive Nd:YAG pulse lasers. The instantaneously acquired single particle images of these cameras have been used for a three dimensional tomographic reconstruction of the light intensity distribution of the particle images in a volume of voxels (volume elements) virtually representing the measurement volume. Each of two subsequently acquired and reconstructed particle image distributions are cross-correlated in small interrogation volumes using iterative multi-grid schemes with volume-deformation in order to determine a time series of instantaneous 3D-3C velocity vector fields with 250 μsec time steps.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Flow structures in a tripped turbulent boundary layer flow An investigation using time-resolved tomographic PIV
Authors:
AuthorsInstitution or Email of Authors
Schröder, AndreasUNSPECIFIED
Geisler, ReinhardUNSPECIFIED
Michaelis, DirkLaVision, Göttingen
Date:2007
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Volume:CD-ROM
Page Range:pp. 1-8
Series Name:Conference Proceedings
Status:Published
Keywords:turbulent boundary layer, 3D-3C velocity, PIV
Event Title:7th International Symposium on Particle Image Velocimetry
Event Location:Roma, Italy
Event Type:international Conference
Event Dates:2007-09-11 - 2007-09-14
HGF - Research field:Aeronautics, Space and Transport (old)
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 > Experimental Methods
Deposited By: Ilka Micknaus
Deposited On:27 Jul 2007
Last Modified:27 Apr 2009 13:31

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