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Wake-Wake Interactions and ITS Potential for Clocking in a Transonic High Pressure Turbine

Hummel, F. (2001) Wake-Wake Interactions and ITS Potential for Clocking in a Transonic High Pressure Turbine. In: The 46th ASME International Gas Turbine & Aeroengine Technical Congress, ASME TURBO EXPO 2001. ASME TURBO EXPO, New Orleans, 04-07. Juni 2001, New Orleans.

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Kurzfassung

Two-dimensional unsteady Navier-Stokes calculations of a transonic single stage high ressure turbine were carried out with emphasis on the flow field behind the rotor. Detailed validation of the numerical procedure with experimental data showed excellent agreement in both time-averaged and time-resolved flow quantities. The numerical time-step as well as the grid resolution allowed the prediction of the Karman vortex streets of both stator and rotor. Therefore the influence of the vorticity shed from the stator on the vortex street of the rotor is detectable. It was found that certain vortices in the rotor wake are enhanced while others are diminished by passing stator wake segments. A schematic of this process is presented. In the relative frame of reference the rotor is operating in a transonic flow field with shocks at the suction side trailing edge. These shocks interact with both rotor and stator wakes. It was found that a shock-modulation occurs in time and space due to the stator wake passing. In the absolute frame of reference behind the rotor a 50% variation in shock strength is observed according to the circumferential or clocking position. Furthermore a substantial weakening of the rotor suction side trailing edge shock in flow direction is detected in an unsteady flow simulation when compared to a steady state alculation which is caused by convection of upstream stator wake segments. The physics of the mentioned unsteady phenomena as well as their influence on design are discussed.

Dokumentart:Konferenzbeitrag (Paper)
Zusätzliche Informationen: LIDO-Berichtsjahr=2001, monograph_id=2001-GT-0302,
Titel:Wake-Wake Interactions and ITS Potential for Clocking in a Transonic High Pressure Turbine
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Hummel, F.NICHT SPEZIFIZIERT
Datum:2001
Erschienen in:The 46th ASME International Gas Turbine & Aeroengine Technical Congress, ASME TURBO EXPO 2001
Herausgeber:
HerausgeberInstitution und/oder E-Mail-Adresse der Herausgeber
ASME, NICHT SPEZIFIZIERT
Status:veröffentlicht
Stichwörter:high-pressure turbine, transonic, clocking
Veranstaltungstitel:ASME TURBO EXPO, New Orleans, 04-07. Juni 2001
Veranstaltungsort:New Orleans
Veranstaltungsart:internationale Konferenz
Veranstalter :ASME
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Luftfahrt
HGF - Programmthema:keine Zuordnung
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L TT - Triebwerkstechnologien
DLR - Teilgebiet (Projekt, Vorhaben):L - Turbinentechnologien
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Antriebstechnik
Hinterlegt von: elib DLR-Beauftragter
Hinterlegt am:16 Sep 2005
Letzte Änderung:06 Jan 2010 13:15

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