000203792 001__ 203792
000203792 005__ 20190317000049.0
000203792 037__ $$aPOST_TALK
000203792 245__ $$aNumerical investigations of the dynamics of the full load vortex rope in a Francis turbine.
000203792 269__ $$a2013
000203792 260__ $$c2013
000203792 336__ $$aTalks
000203792 520__ $$aThe draft tube vortex rope occurring in Francis Turbines at full load is a potential cause of severe system instabilities, limiting the operating range of concerned hydro power plants. Studies focusing on physical mechanisms [1], methods for stability assessment based on numerical flow simulation [2, 3], studies on simplified configurations [4] and detailed numerical simulations [5] have been published. The pulsations of the rope volume being the core element of the system instability, the size and shape and dynamic evolution of the vortex rope predicted by numerical methods are essential in the validation of these methods. More experimental results [6, 7] of the study case underlying former numerical simulations [3], allow a review of these cases with improved boundary conditions, based on measurements instead of assumptions. On the other hand, the completed experimental database provides more validation cases to better understand the shortcomings of the numerical simulation techniques and identify the potential for improvement of predication capabilities. Advances in computational resources and optimization of the numerical parameters have allowed completing the range of comparisons of numerical versus experimental results close to the onset of instability. Results are compared in terms of the globally unsteady behavior as well as local pressure and velocity measurements at different locations in the draft tube.
000203792 6531_ $$aFrancis turbines
000203792 6531_ $$aFull load
000203792 6531_ $$aFlow instability
000203792 6531_ $$aVortex rope
000203792 6531_ $$aCFD
000203792 700__ $$aBraun, Olivier
000203792 700__ $$aTaruffi, Adrien
000203792 700__ $$0243102$$g128646$$aRuchonnet, Nicolas
000203792 700__ $$0244116$$g154802$$aMüller, Andres
000203792 700__ $$0241012$$g104417$$aAvellan, François
000203792 7112_ $$dSeptember 8-11$$cLausanne, Switzerland$$a5th International Workshop on Cavitation and Dynamic Problems in Hydraulic Machinery and Systems
000203792 8564_ $$uhttps://infoscience.epfl.ch/record/203792/files/4.2_Abstract_IAHR_2013_Braun.pdf$$zAbstract$$s60449$$yAbstract
000203792 8564_ $$uhttps://infoscience.epfl.ch/record/203792/files/Presentation_4.2_BRAUN.pdf$$zn/a$$s1283734$$yn/a
000203792 909C0 $$xU10309$$0252135$$pLMH
000203792 909CO $$ooai:infoscience.tind.io:203792$$qGLOBAL_SET$$pSTI$$ppresentation
000203792 917Z8 $$x154802
000203792 937__ $$aEPFL-TALK-203792
000203792 973__ $$aOTHER
000203792 980__ $$aTALK