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Application of Tomographic PIV in a Transonic Cascade

Klinner, Joachim and Willert, Christian (2013) Application of Tomographic PIV in a Transonic Cascade. In: 10th International Symposium on Particle Image Velocimetry (PIV 13). 10th International Symposium on Particle Image Velocimetry - PIV13, 1.-3. Juli 2013, Delft.

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Official URL: http://resolver.tudelft.nl/uuid:c97919bf-3eda-4e1d-9391-d05bff2bf3c7


The contribution demonstrates the applicability of volumetric PIV in a highly loaded compressor cascade at M1 = 0:60. Under these operation conditions the secondary flow structures in the cascade are dominated by a passage vortex located at the base of the blade and near the suction side. The application of volume resolving thick-sheet PIV (or tomo-PIV) near the trailing edge of the cascades blades is intended to demonstrate the techniques potential of instantaneously resolving secondary flow structures within the separation region of the cascade and its ability to derive three dimensional statistical data of fluctuations of velocity in the turbulent flow region. The report describes various aspects of the adaption of the tomographic PIV setup to the restricted access on the cascade wind tunnel. A four camera setup is was used to resolve a measuring volume of 36x�24x�4 mm from which a total of 54�x74x�13 vectors at a spacing of 0.64 mm in x (chord-wise direction) and a spacing of 0.32 mm in y and z could be recovered. The stability of the camera setup is documented by evaluating the image shifts of stationary features due to vibrations of the wind tunnel. Three dimensional reconstruction of the imaged particle volume is achieved with the maximum entropy reconstruction technique (MENT, [2, 6]) and validated against synthetic data as well as conventional MLOS-SMART reconstruction. The reconstruction quality of experimental data is documented by plots of the reconstructed intensity along volume depth. The extraction the three-dimensional displacement field relies on multi-resolution, 3-D correlation processing with iterative volume deformation. The recovered three-dimensional velocity fields are compared at selected planes with (thin-sheet) stereo PIV data.

Item URL in elib:https://elib.dlr.de/83249/
Document Type:Conference or Workshop Item (Speech)
Additional Information:Die Arbeiten wurden im Rahmen des EU Vorschungsvorhabens EU-FP7 AFDAR (Advanced Flow Diagnostics for Aeronautical research) Workpackage 5 durchgeführt.
Title:Application of Tomographic PIV in a Transonic Cascade
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Klinner, Joachimjoachim.klinner (at) dlr.deUNSPECIFIED
Willert, Christianchris.willert (at) dlr.deUNSPECIFIED
Date:1 July 2013
Journal or Publication Title:10th International Symposium on Particle Image Velocimetry (PIV 13)
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:tomo PIV, stereo PIV, MENT, Transonic Cascade, turbulent Corner flow, passage vortex
Event Title:10th International Symposium on Particle Image Velocimetry - PIV13
Event Location:Delft
Event Type:international Conference
Event Dates:1.-3. Juli 2013
HGF - Research field:other
HGF - Program:other
HGF - Program Themes:other
DLR - Research area:no assignment
DLR - Program:no assignment
DLR - Research theme (Project):no assignment
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Engine Measurement Systems
Deposited By: Klinner, Dr.-Ing. Joachim
Deposited On:10 Jul 2013 11:56
Last Modified:08 May 2014 23:24

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