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

Doll, Ulrich and Dues, Michael and Bacci, Tomaso and Picchi, Alessio and Stockhausen, Guido and 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), p. 150. Springer. doi: 10.1007/s00348-018-2607-z. ISSN 0723-4864.

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


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.

Item URL in elib:https://elib.dlr.de/121918/
Document Type:Article
Title:Aero-thermal flow characterization downstream of an NGV cascade by five-hole probe and filtered Rayleigh scattering measurements
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Doll, UlrichPaul Scherrer Institut (CH)https://orcid.org/0000-0002-9876-9509
Bacci, TomasoUniversity of FlorenceUNSPECIFIED
Picchi, AlessioUniversity of FlorenceUNSPECIFIED
Stockhausen, GuidoGuido.Stockhausen (at) dlr.dehttps://orcid.org/0000-0001-5893-5835
Willert, ChristianChris.Willert (at) dlr.dehttps://orcid.org/0000-0002-1668-0181
Date:September 2018
Journal or Publication Title:Experiments in Fluids
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1007/s00348-018-2607-z
Page Range:p. 150
Keywords:Filtered Rayleigh scattering, combustor turbine interaction, nozzle guide vane, temperature profile, velocity profile, optical flow diagnostics, five-hole probe
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 (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Engine Measurement Systems
Deposited By: Willert, Dr.phil. Christian
Deposited On:09 Oct 2018 08:59
Last Modified:01 Nov 2019 03:00

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