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Pressure, temperature and velocity distributions behind an NGV cascade by filtered Rayleigh scattering measurements

Doll, Ulrich and Dues, Michael and Bacci, Tomaso and Picchi, Alessio and Stockhausen, Guido and Willert, Christian (2018) Pressure, temperature and velocity distributions behind an NGV cascade by filtered Rayleigh scattering measurements. 18th International Symposium on Flow Visualization (ISFV2018), 26.-29. Jun. 2018, Zürich, Schweiz.

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Official URL: http://www.isfv18.ethz.ch/


The aero-thermal characterization of turbomachinery flows typically relies on well-proven conventional measurement technology such as pneumatic probes, hot-wire sensors or thermocouples. As these devices have to be introduced into the flow, they disturb the flow field at the actual measuring position. This is especially critical in the context of measurements in narrow flow channels typically found in turbomachinery applications. In this regard, both five-hole probe/temperature measurements as well as laser-optical filtered Rayleigh scattering measurements are carried out in order to characterize pressure, temperature and flow velocities downstream of a nozzle guide vane cascade with lean-burn combustion representative inflow distortions. By comparing the optical Doppler frequency-shifts measured with filtered Rayleigh scattering and calculated from five-hole probe velocity data, the study reveals a significant bias of the probe's velocity measurement caused by strong pressure gradients present in the airfoils' wake regions. In addition, passage flows are notably altered by the probe's intrusive impact on the flow. The study concludes that laser-optical filtered Rayleigh scattering diagnostics overcomes these shortcomings and is well suited to characterize aero-thermal flow properties in turbomachinery environments.

Item URL in elib:https://elib.dlr.de/120883/
Document Type:Conference or Workshop Item (Speech)
Title:Pressure, temperature and velocity distributions behind an NGV cascade by filtered Rayleigh scattering measurements
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Doll, Ulrichulrich.doll (at) psi.chhttps://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:29 June 2018
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:five-hole probe, filtered Rayleigh scattering, laser diagnostics, pressure, temperature, flow velocity, planar measurement, turbomachinery
Event Title:18th International Symposium on Flow Visualization (ISFV2018)
Event Location:Zürich, Schweiz
Event Type:international Conference
Event Dates:26.-29. Jun. 2018
Organizer:ETH Zürich
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:11 Jul 2018 09:08
Last Modified:31 Jul 2019 20:18

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