About: Velocity profile influence on spiral vortex breakdown in diffuser

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
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 (en)
Title	Velocity profile influence on spiral vortex breakdown in diffuser Velocity profile influence on spiral vortex breakdown in diffuser (en)
skos:prefLabel	Velocity profile influence on spiral vortex breakdown in diffuser Velocity profile influence on spiral vortex breakdown in diffuser (en)
skos:notation	RIV/00216305:26210/08:PU75583!RIV10-GA0-26210___
http://linked.open...avai/riv/aktivita	P
http://linked.open...avai/riv/aktivity	P(GP101/06/P190)
http://linked.open...vai/riv/dodaniDat	2010
http://linked.open...aciTvurceVysledku	Rudolf, Pavel
http://linked.open.../riv/druhVysledku	O - Ostatní výsledky nezařaditelné do žádného z výše uvedených druhů výsledku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Vysoké učení technické v Brně / Fakulta strojního inženýrství
http://linked.open...dnocenehoVysledku	402465
http://linked.open...ai/riv/idVysledku	RIV/00216305:26210/08:PU75583
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	spiral vortex breakdown, velocity profile, stability, diffuser, draft tube (en)
http://linked.open.../riv/klicoveSlovo	velocity profile stability diffuser draft tube spiral vortex breakdown
http://linked.open...ontrolniKodProRIV	[ACF11086B3AA]
http://linked.open...in/vavai/riv/obor	BK
http://linked.open...ichTvurcuVysledku	1 (xsd:int)
http://linked.open...cetTvurcuVysledku	1 (xsd:int)
http://linked.open...vavai/riv/projekt	Shape Optimization of the Diffuser with Inlet Circumferential Velocity Component
http://linked.open...UplatneniVysledku	2008
http://linked.open...iv/tvurceVysledku	Rudolf, Pavel
http://localhost/t...ganizacniJednotka	26210

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