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WASSERWIRTSCHAFT
Published in: WASSERWIRTSCHAFT 13/2015

01-05-2015 | Hydropower

Spatio-Temporal Description of the Swirling Flow in Hydraulic Turbine Draft Tube

Authors: Ao. Univ.-Prof. Dr.-Ing. Pavel Rudolf, Dipl.-Ing. David Štefan, Dr.-Ing. Roman Klas

Published in: WASSERWIRTSCHAFT | Issue 13/2015

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Excerpt

Highly swirling flow leaves runner of the hydraulic turbine, which is operated off the best efficiency point. Instability of the swirling flow results in so called vortex rope. Rotating vortex rope is a source of pressure pulsations, causes structural loads, vibrations and noise. Proper orthogonal decomposition (POD) provides a spatio-temporal description of the draft tube swirling flow and proves that only a very limited number of the flow eigenmodes is necessary to describe the flow dynamics. Construction of the reduced order model (ROM), which is derived by projection of Navier-Stokes equation onto POD basis forms a suitable state equation for the draft tube flow control. This paper presents a review of POD application to draft tube flows and a proposal of extension to ROM and closed loop flow control. …
previous article Draft Tube Design Method for Operation at optimal Coefficient of Performance in Low Head Hydropower
next article A Mathematical Model for the Swirling Flow Ingested by the Draft Tube of Francis Turbines

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Metadata
Title
Spatio-Temporal Description of the Swirling Flow in Hydraulic Turbine Draft Tube
Authors
Ao. Univ.-Prof. Dr.-Ing. Pavel Rudolf
Dipl.-Ing. David Štefan
Dr.-Ing. Roman Klas
Publication date
01-05-2015
Publisher
Springer Fachmedien Wiesbaden
Published in
WASSERWIRTSCHAFT / Issue 13/2015
Print ISSN: 0043-0978
Electronic ISSN: 2192-8762
DOI
https://doi.org/10.1007/s35147-015-0511-5

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