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The Effect of a Bend-Slot Casing Treatment on the Blade Tip Flow Field of a Transonic Compressor Rotor

Voges, Melanie und Willert, Christian und Mönig, Reinhard und Schiffer, H.-P. (2013) The Effect of a Bend-Slot Casing Treatment on the Blade Tip Flow Field of a Transonic Compressor Rotor. In: ASME-Paper, GT2013-94006. ASME Turbo Expo: Power for Land, Sea and Air, 2013-06-03 - 2013-06-07, San Antonio, Texas, USA. doi: 10.1115/GT2013-94006.

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Kurzfassung

The application of casing treatments (CT) is an effective measure to increase the stable operating range of modern aero engine or gas turbine compressors. As the development and design process of optimized CT geometries is primarily based on numerical simulations, the need for accurate experimental flow field data for related code validation is increasing with the number of applications. While the stall margin enhancement and other stage characteristics can be verified using con-ventional measurement techniques such as pressure and temperature probes, a deeper insight to the aerodynamic effect of the CT on the rotor flow field can only be provided using non-intrusive, laser-based flow field diagnostics, given that optical access to the compressor stage can be established. The investigation presented herein involved particle image velocimetry (PIV) measurements at high spatial resolution in the blade tip region of the Darmstadt Transonic Compressor Rotor-1 under the influence of a bend-slot CT. Tangential PIV measurement planes were placed at 95% span as well as in the tip gap of the rotor. The investigation included operating conditions at the aerodynamic design point (peak efficiency) and near stall conditions at 100% rpm. Additional reference measurements were performed with the untreated, smooth casing. The experimental study was accomplished by numerical simulations of the same compressor and CT geometry using the DLR TRACE code. Based on the combination of both, experimental and numerical flow field results, a detailed analysis of the shock structures and the tip clearance vortex under the influence of the CT was performed. Under the influence of the CT, the fluid exchange between rotor passage and CT slots – driven by the pressure gradient over the blade tip and the leading edge bow shock, respectively – induces secondary flow structures in the tip vortex regime. At near stall conditions the periodical injection of energized fluid out of the CT cavities was identified to be one of the major effects stabilizing the tip clearance vortex and hence delaying the onset of rotating stall.

elib-URL des Eintrags:https://elib.dlr.de/82781/
Dokumentart:Konferenzbeitrag (Vortrag, Paper)
Titel:The Effect of a Bend-Slot Casing Treatment on the Blade Tip Flow Field of a Transonic Compressor Rotor
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Voges, Melaniemelanie.voges (at) dlr.dehttps://orcid.org/0000-0001-7486-3763NICHT SPEZIFIZIERT
Willert, Christianchris.willert (at) dlr.dehttps://orcid.org/0000-0002-1668-0181NICHT SPEZIFIZIERT
Mönig, Reinhardreinhard.moenig (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Schiffer, H.-P.Technische Universität DarmstadtNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:3 Juni 2013
Erschienen in:ASME-Paper, GT2013-94006
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
DOI:10.1115/GT2013-94006
Status:veröffentlicht
Stichwörter:PIV, casing treatment, compressor, numerical simulation, secondary flow, tip clearance vortex
Veranstaltungstitel:ASME Turbo Expo: Power for Land, Sea and Air
Veranstaltungsort:San Antonio, Texas, USA
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:3 Juni 2013
Veranstaltungsende:7 Juni 2013
Veranstalter :IGTI
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Antriebe (alt)
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L ER - Antriebsforschung
DLR - Teilgebiet (Projekt, Vorhaben):L - Virtuelles Triebwerk und Validierungsmethoden (alt)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Antriebstechnik
Institut für Antriebstechnik > Triebwerksmesstechnik
Hinterlegt von: Voges, Dr. Melanie
Hinterlegt am:10 Jul 2013 14:42
Letzte Änderung:24 Apr 2024 19:49

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