000059037 001__ 59037
000059037 005__ 20190812204857.0
000059037 037__ $$aCONF
000059037 245__ $$aPressure Wall Measurements in the whole Draft Tube : Steady and Unsteady Analysis
000059037 260__ $$bInternational Association For Hydraulic Research$$c2002
000059037 269__ $$a2002
000059037 300__ $$a10
000059037 336__ $$aConference Papers
000059037 490__ $$aHydraulic transients
000059037 500__ $$aUsing Smart Source Parsing 9-12 September pp 3
000059037 520__ $$aFlow in a elbow draft tube is a turbulent complex unsteady flow caused by its rotating nature and the draft tube's geometry. The understanding of the main phenomena that could appear near the BEP and at off-design conditions is important to master the instability of the machine. The results shown in this work are a summary of a very large experimental database. The aim of this investigation work is to analyze the steady and unsteady pressure fields at the wall of the draft tube through extensive pressure measurements. A particular evolution of the steady pressure field appeared according to the operating points around the BEP chosen to study the draft tube recovery break-off. Consequently, the flow is distributed between the 2 channels of the draft tube according to the operating point. The fluctuating pressure field at the cone can be divided mainly in 2 components: first a rotating component at the runner's frequency (f*) and second a syncronous component at 20f* resultant of the interaction rotor-stator frequency. The influence of the spiral casing on the fluctuating pressure is pointed out by representing all phase average signals in the same absolute angular position of the runner. The results at the low discharge operating point without vapour phase show the main pressure fluctuations at the cavitation free vortex frequency as well as the advection of these fluctuations in the elbow and the channel walls.
000059037 700__ $$aArpe, Jorge
000059037 700__ $$g104417$$aAvellan, François$$0241012
000059037 7112_ $$dSeptember 9 -12, 2002$$cLausanne, Switzerland$$a21st IAHR Symposium on Hydraulic Machinery and Systems
000059037 773__ $$j1$$tProceedings of the 21st IAHR Symposium on Hydraulic Machinery and Systems, Lausanne, Switzerland$$q593-602
000059037 8564_ $$zn/a$$uhttps://infoscience.epfl.ch/record/59037/files/FLINDTPU_004.pdf$$s841687
000059037 8564_ $$uhttps://infoscience.epfl.ch/record/59037/files/Pressure%20Wall%20Measurements%20in%20the%20whole%20Draft%20Tube%20%3A%20Steady%20and%20Unsteady%20Analysis.pdf$$s841687
000059037 8564_ $$xpdfa$$uhttps://infoscience.epfl.ch/record/59037/files/Pressure%20Wall%20Measurements%20in%20the%20whole%20Draft%20Tube%20%3A%20Steady%20and%20Unsteady%20Analysis.pdf?subformat=pdfa$$s1927537
000059037 8560_ $$femilie.reynaud@epfl.ch
000059037 909C0 $$xU10309$$pLMH$$0252135
000059037 909CO $$ooai:infoscience.tind.io:59037$$qGLOBAL_SET$$pconf$$pSTI
000059037 937__ $$aLMH-CONF-2002-002
000059037 970__ $$a1343/LMH
000059037 973__ $$rREVIEWED$$aEPFL
000059037 980__ $$aCONF