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

Fischer, Andreas und König, Jörg und Büttner, Lars und Czarske, Jürgen und Stockhausen, Guido und 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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Offizielle URL: http://ltces.dem.ist.utl.pt/lxlaser/lxlaser2012/program.asp

Kurzfassung

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.

Dokumentart:Konferenzbeitrag (Paper)
Titel:Characterization of engine inlet flows by optical measurements of velocity profiles with high measurement rate
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Fischer, AndreasTU Dresden
König, JörgTU Dresden
Büttner, LarsTU Dresden
Czarske, JürgenTU Dresden
Stockhausen, Guidoguido.stockhausen@dlr.de
Christian, Willertchris.willert@dlr.de
Datum:Juli 2012
Referierte Publikation:Ja
In ISI Web of Science:Nein
Seitenbereich:Seiten 1-12
Name der Reihe:Conference Proceedings online
Status:veröffentlicht
Stichwörter:planar Doppler velocimetry, PDV, aircraft engine inlet, aerodynamic interface plane, Doppler global velocimetry
Veranstaltungstitel:16th International Symposium on Applications of Laser Techniques to Fluid Mechanics
Veranstaltungsort:Lisbon, Portugal
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:09-12 Jul 2012
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Antriebe
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L ER - Antriebsforschung
DLR - Teilgebiet (Projekt, Vorhaben):L - Virtuelles Triebwerk und Validierungsmethoden
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Antriebstechnik > Triebwerksmesstechnik
Hinterlegt von: Dr.phil. Christian Willert
Hinterlegt am:22 Aug 2012 11:17
Letzte Änderung:22 Aug 2012 11:17

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