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Performance and accuracy investigations of two Doppler global velocimetry systems applied in parallel

Willert, Christian and Stockhausen, Guido and Klinner, Joachim and Lempereur, Christine and Barricau, Philippe and Loiret, Philippe and Raynal, Jean Claude (2007) Performance and accuracy investigations of two Doppler global velocimetry systems applied in parallel. Measurement Science and Technology, 18 (8), pp. 2504-2512. Insitute of Physics (IOP) Publishing. DOI: 10.1088/0957-0233/18/8/027.

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Official URL: http://www.iop.org/EJ/abstract/0957-0233/18/8/027/

Abstract

Two Doppler global velocimetry systems were applied in parallel to assess their performance in wind tunnel environments. Both DGV systems were mounted on a common traverse surrounding the glass-walled 1.41.8 m2 test section of the wind tunnel. The traverse normally supports a three-component forward-scatter laser Doppler velocimetry system. The reproducible tip-vortex flow field generated by the blunt tip of an airfoil was chosen for this investigation and was precisely surveyed by LDA just prior to the DGV measurements. Both DGV systems shared the same continuous wave laser light source, laser frequency monitoring and fiber optic light sheet delivery system. The principle differences between the DGV implementations are with regard to the imaging configuration. One configuration relied on a single camera view that observed three successively operated light sheets. In the second configuration, three camera views simultaneously observed a single light sheet using a four-branch fiber imaging bundle. The imaging bundle system had all three view points in a forward scattering arrangement which increased the scattering efficiency but reduced the frequency shift sensitivity. Since all three light sheet observation components were acquired onto the same image frame, acquisition times could be reduced to a minimum. On the other hand, the triple light sheet − single camera system observed two light sheets in forward scatter and one light sheet in backscatter. Although three separate images had to be recorded in succession, the image quality, spatial resolution and signal-to-noise ratio was superior to the imaging bundle system. Comparison of the DGV data with LDV measurements shows very good agreement to within 1-2 m/s. The remaining discrepancy has a variety of causes, some are related to the reduced resolving power of the fiber imaging bundle system (graininess, smoothing), exact localization of the receiver head with respect to the scene, laser frequency drift or background influences. The extensive data base available allows a detailed study of the influences of each of these factors.

Document Type:Article
Title:Performance and accuracy investigations of two Doppler global velocimetry systems applied in parallel
Authors:
AuthorsInstitution or Email of Authors
Willert, ChristianUNSPECIFIED
Stockhausen, GuidoUNSPECIFIED
Klinner, JoachimUNSPECIFIED
Lempereur, ChristineDMAE, ONERA (Toulouse)
Barricau, PhilippeDMAE, ONERA (Toulouse)
Loiret, PhilippeDSFM/GFR, ONERA (Fauga-Mauzac)
Raynal, Jean ClaudeDSFM/GFR, ONERA (Fauga-Mauzac)
Date:July 2007
Journal or Publication Title:Measurement Science and Technology
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:18
DOI:10.1088/0957-0233/18/8/027
Page Range:pp. 2504-2512
Publisher:Insitute of Physics (IOP) Publishing
Status:Published
Keywords:velocity field measurement, fiber imaging bundle, wind tunnel diagnostics, camera calibration, DGV, LDA, planar Doppler velocimetry
HGF - Research field:Aeronautics, Space and Transport (old)
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
Institute of Propulsion Technology > Engine Measurement Systems
Deposited By: Dr.phil. Christian Willert
Deposited On:31 Jul 2007
Last Modified:27 Apr 2009 13:47

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