000231256 001__ 231256
000231256 005__ 20190812210002.0
000231256 0247_ $$a10.1088/1755-1315/49/8/082005$$2doi
000231256 037__ $$aCONF
000231256 245__ $$aNumerical and experimental evidence of the inter-blade cavitation vortex development at deep part load operation of a Francis turbine
000231256 260__ $$c2016$$bInternational Association For Hydraulic Research
000231256 269__ $$a2016
000231256 300__ $$a8
000231256 336__ $$aConference Papers
000231256 520__ $$aFrancis turbines are subject to various types of the cavitation flow depending on the operating condition s. In order to compensate for the stochastic nature of renewable energy sources, it is more and more required to extend the operating range of the generating units, from deep part load to full load conditions. In the deep part load condition, the formation of cavitation vortices in the turbine blade-to-blade channel s called inter -blade cavitation vortex is often observed. The understanding of the dynamic characteristics of these inter -blade vortices and their formation mechanisms is of key importance in an effort of developing reliable flow simulation tools. This paper reports the numerical and experimental investigations carried out in order to establish the vortex characteristics, especially the inception and the development of the vortex structure. The unsteady RANS simulation for the multiphase flow is performed with the SST - SA S turbulence model by using the commercial flow solver ANSYS CFX. The simulation results in terms of the vortex structure and the cavitation volume are evaluated by comparing them to the flow visualization s of the blade channel acquired through a specially instrumented guide vane as well as from the downstream of the runner across the draft tube cone. The inter-blade cavitation vortex is successfully captured by the simulation and both numerical and experimental results evidence that the inter -blade vortices are attached to the runner hub.
000231256 542__ $$fCC BY
000231256 700__ $$aYamamoto, K
000231256 700__ $$aMüller, A
000231256 700__ $$aFavrel, A
000231256 700__ $$aLandry, C
000231256 700__ $$aAvellan, F
000231256 7112_ $$dJuly 4-8, 2016$$cGrenoble, France$$a28th IAHR Symposium on Hydraulic Machinery and Systems
000231256 7112_ $$dJuly 4-8, 2016$$cGrenoble, France$$a28th IAHR Symposium on Hydraulic Machinery and Systems
000231256 773__ $$q1-8$$j49$$tProceedings of the 28th IAHR symposium on Hydraulic Machinery and Systems
000231256 8564_ $$uhttps://infoscience.epfl.ch/record/231256/files/Numerical%20and%20experimental%20evidence%20of%20the%20inter-blade%20cavitation%20vortex%20development%20at%20deep%20part%20load%20operation%20of%20a%20Francis%20turbine.pdf$$s948664
000231256 8564_ $$xpdfa$$uhttps://infoscience.epfl.ch/record/231256/files/Numerical%20and%20experimental%20evidence%20of%20the%20inter-blade%20cavitation%20vortex%20development%20at%20deep%20part%20load%20operation%20of%20a%20Francis%20turbine.pdf?subformat=pdfa$$s2125343
000231256 8560_ $$femilie.reynaud@epfl.ch
000231256 909C0 $$xU10309$$pLMH$$0252135
000231256 909CO $$ooai:infoscience.tind.io:231256$$qGLOBAL_SET$$pconf$$pSTI
000231256 917Z8 $$x104417
000231256 937__ $$aEPFL-CONF-231256
000231256 973__ $$rREVIEWED$$aEPFL
000231256 980__ $$aCONF