000255341 001__ 255341
000255341 005__ 20190812210022.0
000255341 037__ $$aCONF
000255341 245__ $$aA statistical method for draft tube pressure pulsation analysis
000255341 260__ $$bInternational Association For Hydraulic Research$$c2012
000255341 269__ $$a2012
000255341 300__ $$a8
000255341 336__ $$aConference Papers
000255341 490__ $$aModels, algorithms and code development in hydrodynamics
000255341 520__ $$aDraft tube pressure pulsation (DTPP) in Francis turbines is composed of various components originating from different physical phenomena. These components may be separated because they differ by their spatial relationships and by their propagation mechanism. The first step for such an analysis was to distinguish between so-called synchronous and asynchronous pulsations; only approximately periodic phenomena could be described in this manner. However, less regular pulsations are always present, and these become important when turbines have to operate in the far off-design range, in particular at very low load. The statistical method described here permits to separate the stochastic (random) component from the two traditional ‘regular’ components. It works in connection with the standard technique of model testing with several pressure signals measured in draft tube cone. The difference between the individual signals and the averaged pressure signal, together with the coherence between the individual pressure signals is used for analysis. An example reveals that a generalized, non-periodic version of the asynchronous pulsation is important at low load.
000255341 542__ $$fCC BY
000255341 700__ $$aDoerfler, P.K.
000255341 700__ $$aRuchonnet, Nicolas$$0243102$$g128646
000255341 7112_ $$dAugust 19–23, 2012$$cBeijing, China$$a26th Symposium on Hydraulic Machinery and Systems
000255341 773__ $$q1-8$$j1$$tProceedings of the 26th Symposium on Hydraulic Machinery and Systems
000255341 8560_ $$femilie.reynaud@epfl.ch
000255341 8564_ $$uhttps://infoscience.epfl.ch/record/255341/files/A%20statistical%20method%20for%20draft%20tube%20pressure%20pulsation%20analysis.pdf$$s1097429
000255341 8564_ $$xpdfa$$uhttps://infoscience.epfl.ch/record/255341/files/A%20statistical%20method%20for%20draft%20tube%20pressure%20pulsation%20analysis.pdf?subformat=pdfa$$s1849099
000255341 909C0 $$xU10309$$pLMH$$mfrancois.avellan@epfl.ch$$0252135
000255341 909CO $$qGLOBAL_SET$$pconf$$pSTI$$ooai:infoscience.epfl.ch:255341
000255341 960__ $$aemilie.reynaud@epfl.ch
000255341 961__ $$alaurence.gauvin@epfl.ch
000255341 973__ $$aEPFL$$rREVIEWED
000255341 980__ $$aCONF
000255341 981__ $$aoverwrite