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Statements

Subject Item
n2:RIV%2F00216305%3A26210%2F14%3APU111796%21RIV15-GA0-26210___
rdf:type
n6:Vysledek skos:Concept
dcterms:description
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. Paper presents review of POD application to draft tube flows and proposal of extension to ROM and closed loop flow control. 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. Paper presents review of POD application to draft tube flows and proposal of extension to ROM and closed loop flow control.
dcterms:title
Spatio-temporal description of the swirling flow in hydraulic turbine draft tube Spatio-temporal description of the swirling flow in hydraulic turbine draft tube
skos:prefLabel
Spatio-temporal description of the swirling flow in hydraulic turbine draft tube Spatio-temporal description of the swirling flow in hydraulic turbine draft tube
skos:notation
RIV/00216305:26210/14:PU111796!RIV15-GA0-26210___
n3:aktivita
n16:P
n3:aktivity
P(GA13-23550S)
n3:dodaniDat
n12:2015
n3:domaciTvurceVysledku
n5:8024197 n5:5409594
n3:druhVysledku
n14:D
n3:duvernostUdaju
n19:S
n3:entitaPredkladatele
n18:predkladatel
n3:idSjednocenehoVysledku
46374
n3:idVysledku
RIV/00216305:26210/14:PU111796
n3:jazykVysledku
n10:eng
n3:klicovaSlova
draft tube, vortex rope, POD, ROM, control
n3:klicoveSlovo
n13:POD n13:vortex%20rope n13:ROM n13:control n13:draft%20tube
n3:kontrolniKodProRIV
[13743064C54B]
n3:mistoKonaniAkce
Vienna
n3:mistoVydani
Vienna
n3:nazevZdroje
Proceedings of 18th International Seminar on Hydropower
n3:obor
n4:JE
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
2
n3:projekt
n15:GA13-23550S
n3:rokUplatneniVysledku
n12:2014
n3:tvurceVysledku
Rudolf, Pavel Štefan, David
n3:typAkce
n7:WRD
n3:zahajeniAkce
2014-11-26+01:00
s:numberOfPages
10
n17:hasPublisher
TU Wien
n21:isbn
978-3-9501937-9-4
n20:organizacniJednotka
26210