000255338 001__ 255338
000255338 005__ 20190812210022.0
000255338 037__ $$aCONF
000255338 245__ $$aEfficient runner safety assessment during early design phase and root cause analysis
000255338 260__ $$bInternational Association For Hydraulic Research$$c2012
000255338 269__ $$a2012
000255338 300__ $$a8
000255338 336__ $$aConference Papers
000255338 490__ $$aDynamics of Hydraulic Machinery
000255338 520__ $$aFatigue related problems in Francis turbines, especially high head Francis turbines, have been published several times in the last years. During operation the runner is exposed to various steady and unsteady hydraulic loads. Therefore the analysis of forced response of the runner structure requires a combined approach of fluid dynamics and structural dynamics.Due to the high complexity of the phenomena and due to the limitation of computer power, the numerical prediction was in the past too expensive and not feasible for the use as standard design tool. However, due to continuous improvement of the knowledge and the simulation tools such complex analysis has become part of the design procedure in ANDRITZ HYDRO. This article describes the application of most advanced analysis techniques in runner safety check (RSC), including steady state CFD analysis, transient CFD analysis considering rotor stator interaction (RSI), static FE analysis and modal analysis in water considering the added mass effect, in the early design phase. This procedure allows a very efficient interaction between the hydraulic designer and the mechanical designer during the design phase, such that a risk of failure can be detected and avoided in an early design stage.The RSC procedure can also be applied to a root cause analysis (RCA) both to find out the cause of failure and to quickly define a technical solution to meet the safety criteria. An efficient application to a RCA of cracks in a Francis runner is quoted in this article as an example. The results of the RCA are presented together with an efficient and inexpensive solution whose effectiveness could be proven again by applying the described RSC technics. It is shown that, with the RSC procedure developed and applied as standard procedure in ANDRITZ HYDRO such a failure is excluded in an early design phase. Moreover, the RSC procedure is compatible with different commercial and open source codes and can be easily adapted to apply for other types of turbines, such as pump turbines and Pelton runners.
000255338 542__ $$fCC BY
000255338 700__ $$aLiang, Q.W.
000255338 700__ $$aLais, S
000255338 700__ $$aBraun, O
000255338 7112_ $$dAugust 19–23, 2012$$cBeijing, China$$a26th Symposium on Hydraulic Machinery and Systems
000255338 773__ $$q1-8$$j1$$tProceedings of the 26th Symposium on Hydraulic Machinery and Systems
000255338 8560_ $$femilie.reynaud@epfl.ch
000255338 8564_ $$uhttps://infoscience.epfl.ch/record/255338/files/Efficient%20runner%20safety%20assessment%20during%20early%20design%20phase%20and%20root%20cause%20analysis.pdf$$s707220
000255338 8564_ $$xpdfa$$uhttps://infoscience.epfl.ch/record/255338/files/Efficient%20runner%20safety%20assessment%20during%20early%20design%20phase%20and%20root%20cause%20analysis.pdf?subformat=pdfa$$s4482162
000255338 909C0 $$xU10309$$pLMH$$mfrancois.avellan@epfl.ch$$0252135
000255338 909CO $$qGLOBAL_SET$$pconf$$pSTI$$ooai:infoscience.epfl.ch:255338
000255338 960__ $$aemilie.reynaud@epfl.ch
000255338 961__ $$alaurence.gauvin@epfl.ch
000255338 973__ $$aEPFL$$rREVIEWED
000255338 980__ $$aCONF
000255338 981__ $$aoverwrite