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Aero-thermal flow characterization downstream of an NGV cascade by five-hole probe and filtered Rayleigh scattering measurements

Doll, Ulrich und Dues, Michael und Bacci, Tomaso und Picchi, Alessio und Stockhausen, Guido und Willert, Christian (2018) Aero-thermal flow characterization downstream of an NGV cascade by five-hole probe and filtered Rayleigh scattering measurements. Experiments in Fluids, 59 (10), Seite 150. Springer Nature. doi: 10.1007/s00348-018-2607-z. ISSN 0723-4864.

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Offizielle URL: https://doi.org/10.1007/s00348-018-2607-z

Kurzfassung

The characterization of pressure, temperature and velocity felds in turbomachinery flows typically relies on well-proven probe-based technology such as pneumatic probes, hot-wire sensors or thermocouples. These devices have to be introduced into narrow flow channels and by that obstruct part of the duct at the actual measuring position, which can signifcantly alter the aerodynamic performance of the components under investigation. In this contribution, measurement results of a commercially available fve-hole probe with mounted temperature sensor and laser-optical-fltered Rayleigh scattering diagnostics are acquired downstream of a nozzle guide vane cascade with lean-burn combustion representative inlet flow distortions. Pressure results obtained by both methods are found to be on a similar absolute level. However, the unavoidable movement of optical elements following the facilities' heat-up procedure prevents a sufcient sensitivity of pressure data obtained by fltered Rayleigh scattering and, therefore, an identifcation of certain flow structures related to probe interference on the static pressure feld. Concerning temperature data, results of both methods, despite the probe data being shifted in lateral direction, are found to be in good agreement in topology as well as absolute level. The strongest intrusive influence of the probe body as well as a bias to probe readings in certain flow regions is identifed when comparing velocity data by means of the optical Doppler frequency-shift. Whereas fltered Rayleigh scattering results follow a smooth and continuous trend, fve-hole probe data are characterized by steep gradients inside the airfoil wakes as well as differing slopes in the flow passages. These fndings are backed by a comparison of fve-hole probe velocities with a CFD solution, revealing an erroneous reading of axial velocities inside the wake areas. The study concludes that the presented fltered Rayleigh scattering diagnostics, with estimated accuracies of 50-90 hPa, 2-3 K and 2-3 MHz in pressure, temperature and Doppler frequency-shift, is a viable alternative to conventional probe-based measuring approaches in characterizing the aero-thermal properties of turbomachinery flows.

elib-URL des Eintrags:https://elib.dlr.de/121918/
Dokumentart:Zeitschriftenbeitrag
Titel:Aero-thermal flow characterization downstream of an NGV cascade by five-hole probe and filtered Rayleigh scattering measurements
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Doll, UlrichPaul Scherrer Institut (CH)https://orcid.org/0000-0002-9876-9509NICHT SPEZIFIZIERT
Dues, MichaelILA R&D GmbHNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Bacci, TomasoUniversity of FlorenceNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Picchi, AlessioUniversity of FlorenceNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Stockhausen, GuidoGuido.Stockhausen (at) dlr.dehttps://orcid.org/0000-0001-5893-5835NICHT SPEZIFIZIERT
Willert, ChristianChris.Willert (at) dlr.dehttps://orcid.org/0000-0002-1668-0181NICHT SPEZIFIZIERT
Datum:September 2018
Erschienen in:Experiments in Fluids
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:59
DOI:10.1007/s00348-018-2607-z
Seitenbereich:Seite 150
Verlag:Springer Nature
ISSN:0723-4864
Status:veröffentlicht
Stichwörter:Filtered Rayleigh scattering, combustor turbine interaction, nozzle guide vane, temperature profile, velocity profile, optical flow diagnostics, five-hole probe
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Antriebssysteme
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L ER - Engine Research
DLR - Teilgebiet (Projekt, Vorhaben):L - Virtuelles Triebwerk und Validierungsmethoden (alt)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Antriebstechnik > Triebwerksmesstechnik
Hinterlegt von: Willert, Dr.phil. Christian
Hinterlegt am:09 Okt 2018 08:59
Letzte Änderung:12 Mai 2023 13:05

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