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Application of Stereoscopic and Tomographic PIV in a Transonic Cascade

Willert, Christian and Klinner, Joachim (2014) Application of Stereoscopic and Tomographic PIV in a Transonic Cascade. AFDAR International Workshop on Advanced Flow Diagnostics for Aeronautical Research, 18-19 Feb. 2014, Lille, France.

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Abstract

The contribution demonstrates the applicability of volumetric PIV in a highly loaded compressor cascade at Ma_1 = 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 contribution 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 36�x24�x4 mm^3 from which a total of 54�x74�x13 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) 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/89597/
Document Type:Conference or Workshop Item (Lecture)
Title:Application of Stereoscopic and Tomographic PIV in a Transonic Cascade
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Willert, Christianchris.willert (at) dlr.deUNSPECIFIED
Klinner, Joachimjoachim.klinner (at) dlr.deUNSPECIFIED
Date:18 February 2014
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:transonic compressor flow, particle image velocimetry (PIV), 3-D PIV, flow diagnostics, separated flow, passage vortex
Event Title:AFDAR International Workshop on Advanced Flow Diagnostics for Aeronautical Research
Event Location:Lille, France
Event Type:international Conference, Workshop
Event Dates:18-19 Feb. 2014
Organizer:Ecole Centrale de Lille
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Virtual Engine and Validation methods
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Engine Measurement Systems
Institute of Propulsion Technology > Fan and Compressor
Deposited By: Willert, Dr.phil. Christian
Deposited On:30 Jun 2014 11:59
Last Modified:31 Jul 2019 19:46

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