Publication detail
Decomposition of the swirling flow field downstream of Francis turbine runner
RUDOLF, P. ŠTEFAN, D.
Czech title
Dekompozice vírového proudového pole pod obežným kolem Francisovy turbíny
English title
Decomposition of the swirling flow field downstream of Francis turbine runner
Type
conference paper
Language
en
Original abstract
Practical application of proper orthogonal decomposition (POD) is presented. Spatio-temporal behaviour of the coherent vortical structures in the draft tube of hydraulic turbine is studied for two partial load operating points. POD enables to identify the eigen modes, which compose the flow field and rank the modes according to their energy. Swirling flow fields are decomposed, which provides information about their streamwise and crosswise development and the energy transfer among modes. Presented methodology also assigns frequencies to the particular modes, which helps to identify the spectral properties of the flow with concrete mode shapes. Thus POD offers a complementary view to current time domain simulations or measurements.
Czech abstract
Článek prezentuje aplikaci vlastní ortogonální dekompozice (POD) na vírové proudění v sací troubě Francisovy turbíny pro dva provozní body. POD umožňuje identifikovat vlastní tvary tlaku a rychlosti a seřadit je dle jejich důležitosti pro výsledný obraz proudění. POD poskytuje významou doplňující informaci k běžným výpočtům v časové doméně.
English abstract
Practical application of proper orthogonal decomposition (POD) is presented. Spatio-temporal behaviour of the coherent vortical structures in the draft tube of hydraulic turbine is studied for two partial load operating points. POD enables to identify the eigen modes, which compose the flow field and rank the modes according to their energy. Swirling flow fields are decomposed, which provides information about their streamwise and crosswise development and the energy transfer among modes. Presented methodology also assigns frequencies to the particular modes, which helps to identify the spectral properties of the flow with concrete mode shapes. Thus POD offers a complementary view to current time domain simulations or measurements.
Keywords in Czech
dekompozice, vírové proudění, vlastní ortogonální dekompozice, stabilita, vírový cop, sací trouba
Keywords in English
decomposition, swirling flow, proper orthogonal decomposition, stability, vortex rope, draft tube
RIV year
2012
Released
18.12.2012
Publisher
IOP Publishing Ltd.
ISSN
1755-1315
Book
IOP Conference Series-Earth and Environmental Science
Volume
15
Number
6
Pages from–to
1–8
Pages count
8
BIBTEX
@inproceedings{BUT97197,
author="Pavel {Rudolf} and David {Štefan},
title="Decomposition of the swirling flow field downstream of Francis turbine runner",
booktitle="IOP Conference Series-Earth and Environmental Science",
year="2012",
volume="15",
number="6",
month="December",
pages="1--8",
publisher="IOP Publishing Ltd.",
issn="1755-1315"
}