000265870 001__ 265870
000265870 005__ 20190812204801.0
000265870 0247_ $$2doi$$a10.1088/1755-1315/240/2/022022
000265870 037__ $$aCONF
000265870 245__ $$aReduced scale model testing for prediction of eigenfrequencies and hydro-acoustic resonances in hydropower plants operating in off-design conditions
000265870 260__ $$c2019
000265870 269__ $$a2019
000265870 336__ $$aConference Papers
000265870 520__ $$aThe massive penetration of the electrical network by renewable energy sources, such as wind and solar, pushes the operators to extend hydropower plant units operating range to meet the transmission system operator requirements. However, in off-design operating conditions, flow instabilities are developing in Francis turbines, inducing cavitation, pressure pulsations and potentially resonance that can threaten the stability of the whole system. Reduced scale model testing is commonly performed to assess the hydraulic behaviour of the machine for industrial projects. However, it is not possible to directly transpose pressure pulsations and resonance conditions from model to prototype since the characteristics of the hydraulic circuits are different from model to prototype. In this paper, a methodology developed in the framework of the HYPERBOLE European research project for predicting the eigenfrequencies of hydropower plant units operating in off-design conditions is introduced. It is based on reduced scale model testing and proper one-dimensional modelling of the hydraulic circuits, including the draft tube cavitation flow, at both the model and prototype scales. The hydro-acoustic parameters in the draft tube are identified at the model scale for a wide number of operating conditions and, then, transposed to the full-scale machine, together with the precession frequency for part load conditions. This enables the prediction of the eigenfrequencies and resonance conditions of the full-scale generating unit.
000265870 700__ $$g215937$$aFavrel, Arthur
000265870 700__ $$g183522$$aGomes Pereira Junior, Joao$$0249112
000265870 700__ $$aLandry, Christian
000265870 700__ $$aAlligné, Sébastien
000265870 700__ $$aNicolet, Christophe
000265870 700__ $$aAvellan, François$$g104417
000265870 7112_ $$a29th IAHR Symposium on Hydraulic Machinery and Systems$$cKyoto, Japan$$d17–21 September 2018
000265870 773__ $$tIOP Conference Series: Earth and Environmental Science$$j240$$q022022
000265870 8560_ $$farthur.favrel@epfl.ch
000265870 8564_ $$zFinal$$uhttps://infoscience.epfl.ch/record/265870/files/Favrel_2019_IOP_Conf._Ser.__Earth_Environ._Sci._240_022022.pdf$$s1201942
000265870 909C0 $$pLMH$$mfrancois.avellan@epfl.ch$$0252135$$zMarselli, Béatrice$$xU10309
000265870 909CO $$pconf$$pSTI$$ooai:infoscience.epfl.ch:265870
000265870 960__ $$aarthur.favrel@epfl.ch
000265870 961__ $$afantin.reichler@epfl.ch
000265870 973__ $$rREVIEWED$$aEPFL
000265870 980__ $$aCONF
000265870 981__ $$aoverwrite