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Combination of robust point measurement techniques on the vortex tube: FRS, DGV and L2F deliver thermodynamic and flow properties

Burow, Eike Jens and Beversdorff, Manfred and Stockhausen, Guido and Schroll, Michael and Willert, Christian (2018) Combination of robust point measurement techniques on the vortex tube: FRS, DGV and L2F deliver thermodynamic and flow properties. In: 19th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics. 19th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics, 16.-19. Jul. 2018, Lisbon, Portugal. (In Press)

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Abstract

High-end laser-optical measurements on industrial applications are often restricted to optical access via endoscopes. Since usually no single technique is able to all relevant variables of major technical flows, there is great interest in complemental combinations. This contribution presents a single-point approach to joining Filtered Rayleigh Scattering (FRS) with Doppler Global Velocimetry (DGV) and Laser-2-Focus (L2F): while L2F delivers two velocity components, temperature and pressure data are supplied by FRS. The third velocity component is added by both DGV and FRS. To put this vision into effect, measurements of all three techniques are conducted on a uniflow Ranque-Hilsch vortex tube using the same hardware: since the system has been originally designed for 3c-L2F the main focus is on the addition of FRS. While measurement results are validated literature sources and additional PIV reference data, challenges and solutions of the system setup as well as data evaluation methods are discussed: although calibrated numerical models for Rayleigh scattering spectra can be used to incorporate systematic deviations, the physically well-founded Tenti-S6-model once again proves to deliver accurate output under tough conditions. As a main result it is found that fluorescence background is emerging from signal fibers: strong Mie scattered light originating from particles needed for L2F and DGV may excite a fused silica fiber and produce broadband luminescence. Since this occurs before the FRS-typical powerful background filtering, it leads to disruptive cross-talk on the considerably lower FRS signal. Solving this issue promises simultaneous measurements of particle and fluid velocity, allowing slip analysis.

Item URL in elib:https://elib.dlr.de/120348/
Document Type:Conference or Workshop Item (Speech)
Title:Combination of robust point measurement techniques on the vortex tube: FRS, DGV and L2F deliver thermodynamic and flow properties
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Burow, Eike JensEike.Burow (at) dlr.deUNSPECIFIED
Beversdorff, Manfredmanfred.beversdorff (at) dlr.deUNSPECIFIED
Stockhausen, Guidoguido.stockhausen (at) dlr.deUNSPECIFIED
Schroll, Michaelmichael.schroll (at) dlr.deUNSPECIFIED
Willert, Christianchris.willert (at) dlr.deUNSPECIFIED
Date:16 July 2018
Journal or Publication Title:19th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:In Press
Keywords:FRS, DGV, L2F, Point measurements, Ranque-Hilsch vortex tube
Event Title:19th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics
Event Location:Lisbon, Portugal
Event Type:international Conference
Event Dates:16.-19. Jul. 2018
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Laser Research and Technology, E - Gas Turbine
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Engine Measurement Systems
Deposited By: Burow, Eike Jens
Deposited On:18 Jun 2018 10:31
Last Modified:31 Jul 2019 20:18

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