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Characterization of engine inlet flows by optical measurements of velocity profiles with high measurement rate

Fischer, Andreas and König, Jörg and Büttner, Lars and Czarske, Jürgen and Stockhausen, Guido and Christian, Willert (2012) Characterization of engine inlet flows by optical measurements of velocity profiles with high measurement rate. 16th International Symposium on Applications of Laser Techniques to Fluid Mechanics, 09-12 Jul 2012, Lisbon, Portugal.

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Official URL: http://ltces.dem.ist.utl.pt/lxlaser/lxlaser2012/program.asp

Abstract

For characterizing inlet flows of aircraft engines, grids of 40 pressure probes are applied as state-of-the-art for measuring the pressure fluctuations in the inlet with a typical measurement rate of 4 kHz. In order to get a more flexible and non-intrusive measurement setup, frequency modulated Doppler global velocimetry (FM-DGV) is applied in an inlet flow experiment for the first time measuring the flow velocity fluctuations. The novel approach includes using an imaging fiber bundle and an endoscope for light detection from inside the inlet without disturbing the flow significantly. The key challenge was to achieve a sufficiently high measurement rate, which is limited by the signal to noise ratio. In the experiment, measurement rates of up to 8 kHz were achieved. This proves the principle applicability of FM-DGV for inlet flow characterization. The single component setup consisted of 16 measurement points linearly aligned at a radial line (compared to 10 points with a probe rake). The measured mean velocity profiles were validated by the air mass flow rate. Measurements with 0.5 kg/s and 1 kg/s were accomplished. The resolved velocity spectra indicate significant flow oscillations up to about 1 kHz. As expected, the spectra show stronger oscillations when inserting a distortion plate. Hence, FM-DGV is proven to be a promising technique for the non-intrusive characterization of inlet flows at high measurement rates.

Document Type:Conference or Workshop Item (Paper)
Title:Characterization of engine inlet flows by optical measurements of velocity profiles with high measurement rate
Authors:
AuthorsInstitution or Email of Authors
Fischer, AndreasTU Dresden
König, JörgTU Dresden
Büttner, LarsTU Dresden
Czarske, JürgenTU Dresden
Stockhausen, Guidoguido.stockhausen@dlr.de
Christian, Willertchris.willert@dlr.de
Date:July 2012
Refereed publication:Yes
In ISI Web of Science:No
Page Range:pp. 1-12
Series Name:Conference Proceedings online
Status:Published
Keywords:planar Doppler velocimetry, PDV, aircraft engine inlet, aerodynamic interface plane, Doppler global velocimetry
Event Title:16th International Symposium on Applications of Laser Techniques to Fluid Mechanics
Event Location:Lisbon, Portugal
Event Type:international Conference
Event Dates:09-12 Jul 2012
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
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Engine Measurement Systems
Deposited By: Dr.phil. Christian Willert
Deposited On:22 Aug 2012 11:17
Last Modified:22 Aug 2012 11:17

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