000181207 001__ 181207
000181207 005__ 20190812205637.0
000181207 0247_ $$2doi$$a10.1088/1755-1315/15/3/032040
000181207 02470 $$2ISI$$a000324782300070
000181207 037__ $$aCONF
000181207 245__ $$aInteraction of a pulsating vortex rope with the local velocity field in a Francis turbine draft tube
000181207 269__ $$a2013
000181207 260__ $$bIOP science$$c2013$$aBristol
000181207 336__ $$aConference Papers
000181207 520__ $$aAcoustic resonances in Francis turbines often define undesirable limitations to their operating ranges at high load. The knowledge of the mechanisms governing the onset and the sustenance of these instabilities in the swirling flow leaving the runner is essential for the development of a reliable hydroacoustic model for the prediction of system stability. The present work seeks to study experimentally the unstable draft tube flow by conducting a series of measurements on a reduced Francis Turbine model. The key physical parameters and their interaction with the hydraulic and mechanical system are studied and quantified. In particular, the evolution of the axial and tangential velocity components in the draft tube cone is analysed by means of Laser Doppler Anemometry. Combined with the calculation of the instantaneous vortex rope volume based on flow visualization and the measurement of the pressure fluctuations, the nature of the auto-oscillation in the draft tube flow is investigated.
000181207 6531_ $$aDraft Tube
000181207 6531_ $$aSurge
000181207 6531_ $$aLDV
000181207 6531_ $$aFrancis turbines
000181207 6531_ $$aVortex rope
000181207 700__ $$0244116$$g154802$$aMüller, Andres
000181207 700__ $$0246523$$g179188$$aBullani, Alberto
000181207 700__ $$0245367$$g170853$$aDreyer, Matthieu
000181207 700__ $$0243101$$g160440$$aRoth, Steven
000181207 700__ $$0245980$$g215937$$aFavrel, Arthur
000181207 700__ $$0245304$$g170545$$aLandry, Christian
000181207 700__ $$0241012$$g104417$$aAvellan, François
000181207 7112_ $$dAugust 19-23, 2012$$cBeijing, China$$a26th IAHR Symposium on Hydraulic Machinery and Systems
000181207 720_1 $$aWu, Y.$$eed.
000181207 720_1 $$aWang, Z.$$eed.
000181207 720_1 $$aLiu, S.$$eed.
000181207 720_1 $$aYuan, S.$$eed.
000181207 720_1 $$aLuo, X.$$eed.
000181207 720_1 $$aWang, F.$$eed.
000181207 773__ $$j15$$tIOP Conference Series: Earth and Environmental Science$$k3$$q032040
000181207 8564_ $$zPublisher's version$$yPublisher's version$$uhttps://infoscience.epfl.ch/record/181207/files/1755-1315_15_3_032040.pdf$$s759087
000181207 909C0 $$xU10309$$pLMH$$0252135
000181207 909CO $$ooai:infoscience.tind.io:181207$$qGLOBAL_SET$$pconf$$pSTI
000181207 917Z8 $$x154802
000181207 917Z8 $$x154802
000181207 917Z8 $$x148230
000181207 937__ $$aEPFL-CONF-181207
000181207 973__ $$rREVIEWED$$sPUBLISHED$$aEPFL
000181207 980__ $$aCONF