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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 und Beversdorff, Manfred und Stockhausen, Guido und Schroll, Michael und 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. (im Druck)

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Kurzfassung

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.

elib-URL des Eintrags:https://elib.dlr.de/120348/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Combination of robust point measurement techniques on the vortex tube: FRS, DGV and L2F deliver thermodynamic and flow properties
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Burow, Eike JensEike.Burow (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Beversdorff, Manfredmanfred.beversdorff (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Stockhausen, Guidoguido.stockhausen (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Schroll, Michaelmichael.schroll (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Willert, Christianchris.willert (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:16 Juli 2018
Erschienen in:19th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:im Druck
Stichwörter:FRS, DGV, L2F, Point measurements, Ranque-Hilsch vortex tube
Veranstaltungstitel:19th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics
Veranstaltungsort:Lisbon, Portugal
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:16.-19. Jul. 2018
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Flugzeuge
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AR - Aircraft Research
DLR - Teilgebiet (Projekt, Vorhaben):L - Laserforschung und Technologie (alt), E - Gasturbine (alt)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Antriebstechnik > Triebwerksmesstechnik
Hinterlegt von: Burow, Eike Jens
Hinterlegt am:18 Jun 2018 10:31
Letzte Änderung:31 Jul 2019 20:18

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