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Parametric studies of the aerodynamic excitation in high pressure turbines

Jöcker, M. and Freudenreich, K. and Fransson, T.H. and Rehder, H.-J. (2000) Parametric studies of the aerodynamic excitation in high pressure turbines. 9th International Symposium on Unsteady Aerodynamics, Aeroacoustics and Aeroelasticity of Turbomachines (ISUAAAT), Lyon/France, 4.-8. September 2000, Frankreich.

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Abstract

Numerical and experimental studies are performed on the influence of several key parameters on the aerodynamic exitation of a high-pressure turbine rotor blade row due to the upstream stator row. In order to change the vane passing frequency two stators with similar vane shapes and identical exit Mach number and exit flow angle are used. To be able to separate subsonic and transonic stator induced flow distortions data is recorded at two different flow regimes. The axial gap between stator and rotor is varied as well. Experiments were run in a closed loop high speed annular wind tunnel. Unsteady velocity data were measured with a three-dimensional Laser-Two-Focus anemometer between stator and rotor and downstream of the rotor. The unsteady part of the instantaneous velocity, the gust, is split into streamwise, transverse and radial components and harmonically decomposed. This data is compared to numerical results obtained with a quasi 3D method (UNSFLO) and analysed regarding two aspects: the dependency of the gust on the changed parameters and the impact of the gust on the forcing function (blade excitation pressures).

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=2000,
Title:Parametric studies of the aerodynamic excitation in high pressure turbines
Authors:
AuthorsInstitution or Email of Authors
Jöcker, M.KTH Stockholm
Freudenreich, K.KTH Stockholm
Fransson, T.H.KTH Stockholm
Rehder, H.-J.UNSPECIFIED
Date:2000
Status:Published
Keywords:high pressure turbine stage, probe and Laser-2-Focus measurements, flow field calculations (UNSFLOW), aerodynamic exitations, gust components, forcing functions
Event Title:9th International Symposium on Unsteady Aerodynamics, Aeroacoustics and Aeroelasticity of Turbomachines (ISUAAAT), Lyon/France, 4.-8. September 2000
Event Location:Frankreich
Event Type:international Conference
Organizer:ISUAAAT
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L TT - Triebwerkstechnologien
DLR - Research theme (Project):L - Turbine Technologies
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology
Deposited By: elib DLR-Beauftragter
Deposited On:16 Sep 2005
Last Modified:06 Jan 2010 13:11

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