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Erschienen in:

2013 | OriginalPaper | Buchkapitel

4. High-Frequency Vortex Phenomena

verfasst von : Peter Dörfler, Mirjam Sick, André Coutu

Erschienen in: Flow-Induced Pulsation and Vibration in Hydroelectric Machinery

Verlag: Springer London

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Abstract

As a straightforward consequence of dimensional analysis, the frequency of vortex phenomena increases proportionally with the flow velocity, and is inversely proportional to its size. Thus, while draft tube surges are in the Hertz range—the characteristic length being the runner diameter, Von Kármán eddies are basically determined by a trailing edge thickness, and due to the smaller size their frequency is well in the audible range. The Von Kármán eddies have to be minimized by using particular profiles for the trailing edges, in particular in the stay vanes and runner blades, or otherwise the lock-in effect and the narrow-band character of the phenomenon may put the structural safety at risk.

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Vorheriges Kapitel Periodic Effects of Runner-Casing Interaction

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Titel: High-Frequency Vortex Phenomena
verfasst von: Peter Dörfler
Mirjam Sick
André Coutu
Verlag: Springer London
Buch: Flow-Induced Pulsation and Vibration in Hydroelectric Machinery
Print ISBN: 978-1-4471-4251-5

Electronic ISBN: 978-1-4471-4252-2

Copyright-Jahr: 2013
DOI: https://doi.org/10.1007/978-1-4471-4252-2_4