Flow through a steam turbine cascade with a single damaged blade
Effect of blade height on loss and outflow angle distribution
Publication date
2022-10-28
Document type
Konferenzbeitrag
Author
Organisational unit
Conference
ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition (GT 2022) ; Rotterdam, Netherlands ; June 13-17, 2022
Publisher
The American Society of Mechanical Engineers
Book title
Proceedings of ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition (GT 2022)
Volume (part of multivolume book)
2
Article ID
V002T20A008
Part of the university bibliography
✅
Language
English
Abstract
Flow measurements were made in a steam turbine cascade with a single blade of reduced height modeling a blade damage. In the experiments, the height of the single blade varied from full span (i.e., no tip clearance) up to totally removing the blade. The experimental investigation was supported by computational fluid dynamics (CFD) simulations which enabled further insight into local flow phenomena and mechanisms. It was found that the additional loss due to a gap increased strongly for the usual clearance level of a few percent of the blade chord but reached a relatively stable high loss plateau for higher clearances or rudimentary blades in the cascade flow channel. The tip-leakage vortex remained to be the dominant downstream flow feature and contains a high amount of loss, but for rudimentary blades, it transforms to the vortex pattern also observed for finite wings. Regarding the impact on the outflow angle distribution, the local downstream flow field can be interpreted by using the relations for cascades with high and low solidity.
Version
Published version
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Metadata only access