000148338 001__ 148338
000148338 005__ 20190812205411.0
000148338 037__ $$aCONF
000148338 245__ $$aInviscid Vortex Breakdown in Decelerated Swirling Flows and Flow Control Methods
000148338 269__ $$a2006
000148338 260__ $$c2006
000148338 336__ $$aConference Papers
000148338 520__ $$aThe paper is focused on decelerated swirling flow behavior as the upstream swirl intensity is increased. We define simplified flow model and boundary conditions in order to analyze the basic flow features. Numerical experiments are carried out for incompressible, inviscid, axisymmetric flow, with incoming Burgers vortex in a sinusoidal shaped diffuser. As the swirl intensity increases we find first a steady flow without breakdown, then a steady axisymmetric vortex breakdown with a central stagnation region, and finally an unsteady vortex breakdown with vortex rings developed and convected downstream. The main result of the paper is that the unsteady vortex breakdown can be removed by injecting a weak axial jet on the inlet section, with no more than 0.5% of the overall discharge. This flow control technique is particularly relevant for swirling flow in the draft tube cone of Francis turbines operated at part load.
000148338 6531_ $$aInviscid swirling flow
000148338 6531_ $$aDiffuser
000148338 6531_ $$aVortex breakdown
000148338 6531_ $$aFlow control
000148338 700__ $$aSusan-Resiga, Romeo
000148338 700__ $$aMuntean, Sebastian
000148338 700__ $$aBernad, Sandor
000148338 700__ $$0243100$$g176678$$aHasmatuchi, Vlad
000148338 700__ $$aAnton, Ioan
000148338 700__ $$aAvellan, François$$g104417$$0241012
000148338 7112_ $$dJune 30- July 1, 2006$$cBucharest, Romania$$a2nd Workshop on Vortex Dominated Flows
000148338 909C0 $$xU10309$$pLMH$$0252135
000148338 909CO $$pconf$$pSTI$$ooai:infoscience.tind.io:148338
000148338 917Z8 $$x176678
000148338 937__ $$aEPFL-CONF-148338
000148338 973__ $$rNON-REVIEWED$$sPUBLISHED$$aOTHER
000148338 980__ $$aCONF