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Statements

Subject Item
n2:RIV%2F00216305%3A26210%2F08%3APU75583%21RIV10-GA0-26210___
rdf:type
skos:Concept n10:Vysledek
dcterms:description
Flow in diffuser with circumferential velocity component is accompanied by spiral vortex breakdown for large diffuser divergence angles. This phenomenon, although being investigated for almost fifty years1,2, is not fully understood yet. Study of this problem is essential for example for design of hydraulic turbine draft tubes operating in part load conditions, where vortex breakdown causes severe pressure pulsations. It is well known that tangential velocity profile plays important role in origin and character of the vortex breakdown3. Aim of this paper is to find influence of tangential velocity profile on spiral vortex breakdown, not only in terms of swirl number, but also in terms of velocity profile shape. Experiment was carried out for diffuser divergence angle 11.6 degrees. Inlet circumferential velocity profile was provided by swirl generator with fixed blades. Velocity field was measured with LDA and pressure was recorded on the diffuser walls to obtain frequency spectra of the vortex rotatio Flow in diffuser with circumferential velocity component is accompanied by spiral vortex breakdown for large diffuser divergence angles. This phenomenon, although being investigated for almost fifty years1,2, is not fully understood yet. Study of this problem is essential for example for design of hydraulic turbine draft tubes operating in part load conditions, where vortex breakdown causes severe pressure pulsations. It is well known that tangential velocity profile plays important role in origin and character of the vortex breakdown3. Aim of this paper is to find influence of tangential velocity profile on spiral vortex breakdown, not only in terms of swirl number, but also in terms of velocity profile shape. Experiment was carried out for diffuser divergence angle 11.6 degrees. Inlet circumferential velocity profile was provided by swirl generator with fixed blades. Velocity field was measured with LDA and pressure was recorded on the diffuser walls to obtain frequency spectra of the vortex rotatio
dcterms:title
Velocity profile influence on spiral vortex breakdown in diffuser Velocity profile influence on spiral vortex breakdown in diffuser
skos:prefLabel
Velocity profile influence on spiral vortex breakdown in diffuser Velocity profile influence on spiral vortex breakdown in diffuser
skos:notation
RIV/00216305:26210/08:PU75583!RIV10-GA0-26210___
n4:aktivita
n8:P
n4:aktivity
P(GP101/06/P190)
n4:dodaniDat
n5:2010
n4:domaciTvurceVysledku
n14:8024197
n4:druhVysledku
n17:O
n4:duvernostUdaju
n12:S
n4:entitaPredkladatele
n13:predkladatel
n4:idSjednocenehoVysledku
402465
n4:idVysledku
RIV/00216305:26210/08:PU75583
n4:jazykVysledku
n11:eng
n4:klicovaSlova
spiral vortex breakdown, velocity profile, stability, diffuser, draft tube
n4:klicoveSlovo
n9:spiral%20vortex%20breakdown n9:stability n9:velocity%20profile n9:diffuser n9:draft%20tube
n4:kontrolniKodProRIV
[ACF11086B3AA]
n4:obor
n7:BK
n4:pocetDomacichTvurcuVysledku
1
n4:pocetTvurcuVysledku
1
n4:projekt
n15:GP101%2F06%2FP190
n4:rokUplatneniVysledku
n5:2008
n4:tvurceVysledku
Rudolf, Pavel
n16:organizacniJednotka
26210