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Comparison of Experimental and Theoretical Results for Unsteady Transonic Cascade Flow at Design and Off-Design Conditions.

Carstens, V. and Bölcs, A. (1) and Körbacher, H. (1), (1993) Comparison of Experimental and Theoretical Results for Unsteady Transonic Cascade Flow at Design and Off-Design Conditions. ASME The American Society of Mechanical Engineers, 345 E. 47th St. New York, N.Y., 10017.

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Abstract

This paper presents experimental and theoretical results for turbine cascades performing harmonic oscillations in transonic flow at design and off-design conditions. The experimental investigations were performed in an annular test facility where unsteady blade pressures were measured in two different test cascades, one operating at the nominal inlet flow angle, the other at an incidence angle exceeding the normal value by more than 20 degrees. The corresponding theoretical results were computed with a 2D Euler code which makes use of flux vector splitting in combination with a time-dependent grid generation. The present data were all obtained for tuned bending modes where the blades performed heaving oscillations with the same frequency and amplitude, but with a constant interblade phase angle. For the cascade operating at design conditions, the steady flow was purely subsonic. The other test cascade was run in transonic flow, and a normal shock appeared on the rear part of the blade's suction surface. It was found that measured unsteady pressure and damping coefficients are well reproduced by the computedresults for the first test cascade. In the case of steady off-design flow (the second test cascade), significant differences between experimental and theoretical results are observed.

Item URL in elib:https://elib.dlr.de/39582/
Document Type:Article
Additional Information: event_title=Gas Turbine and Aeroengine Congress and Exposition, Cincinnati, Ohio, May 24-27, 1993., LIDO-Berichtsjahr=1993, pages=10,
Title:Comparison of Experimental and Theoretical Results for Unsteady Transonic Cascade Flow at Design and Off-Design Conditions.
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Carstens, V.UNSPECIFIEDUNSPECIFIED
Bölcs, A. (1) and Körbacher, H. (1), UNSPECIFIEDUNSPECIFIED
Date:1993
Journal or Publication Title:ASME The American Society of Mechanical Engineers, 345 E. 47th St. New York, N.Y., 10017
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
Series Name:93-GT-100
Status:Published
Keywords:Cascade flow, unsteady transonic flow, blade vibrations, shock motion, design and off-design conditions.
HGF - Research field:UNSPECIFIED
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:UNSPECIFIED
DLR - Program:L TT - Triebwerkstechnologien
DLR - Research theme (Project):UNSPECIFIED
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity
Deposited By: DLR-Beauftragter, elib
Deposited On:02 Apr 2006
Last Modified:27 Apr 2009 10:47

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