000126029 001__ 126029
000126029 005__ 20190316234325.0
000126029 037__ $$aCONF
000126029 245__ $$aHydro Elastic Behavior of Vibrating Blades
000126029 260__ $$bInternational Association For Hydraulic Research$$c2008
000126029 269__ $$a2008
000126029 336__ $$aConference Papers
000126029 500__ $$aHydrodyna
000126029 520__ $$aFluid-structure investigations in hydraulic machines using coupled simulations are extremely time-consuming; therefore we develop an alternative method. In this paper, a model is proposed to predict fluid-structure coupling by linearizing the hydrodynamic load acting on a rigid oscillating 2D hydrofoil surrounded by an incompressible turbulent flow. Forced and free pitching motions are considered with a mean incidence of 0° and maximum amplitude of 2°. Unsteady flow simulations, performed with ANSYS CFX, are presented and validated with experiments carried out in the EPFL High-Speed Cavitation Tunnel. The hydrodynamic moment is assumed to result from three actions: inertia, damping and stiffness. The forced motion is investigated for reduced frequencies ranging from 0.02 to 100. As expected by the potential flow analysis, the added moment of inertia is found constant, while the fluid damping and the fluid stiffness coefficients are found to depend solely on the reduced frequency after an appropriate scaling. Behavioral patterns are observed and two different cases are identified depending on the development of vortices in the hydrofoil wake. Using the coefficients identified in the forced motion case, the time history of the profile incidence is then predicted analytically in the free motion case. An excellent agreement is observed with results from coupled fluid-structure simulations. The model is validated and can then be extended to more complex cases such as blade assemblies.
000126029 542__ $$fCC BY
000126029 6531_ $$aFluid Structure
000126029 6531_ $$ahydrofoil
000126029 6531_ $$aadded mass
000126029 6531_ $$afluid damping
000126029 6531_ $$afluid stiffness
000126029 700__ $$0243094$$aMünch, Cecile$$g171834
000126029 700__ $$aAusoni, Philippe
000126029 700__ $$aBraun, Olivier
000126029 700__ $$0240473$$aFarhat, Mohamed$$g123870
000126029 700__ $$0241012$$aAvellan, Francois$$g104417
000126029 7112_ $$a24th Symposium on Hydraulic Machinery and Systems$$cFoz Do Iguassu$$dOctober 27-31, 2008
000126029 7112_ $$a24th Symposium on Hydraulic Machinery and Systems$$cFoz do Iguassu, Brazil$$dOctober 27-31, 2008
000126029 773__ $$j1$$q10$$tProceedings of the 24th Symposium on Hydraulic Machinery and Systems
000126029 8560_ $$femilie.reynaud@epfl.ch
000126029 8564_ $$zURL
000126029 8564_ $$s693085$$uhttps://infoscience.epfl.ch/record/126029/files/IAHR_munch.pdf$$zn/a
000126029 8564_ $$s445626$$uhttps://infoscience.epfl.ch/record/126029/files/Hydro%20Elastic%20Behavior%20of%20Vibrating%20Blades.pdf
000126029 8564_ $$s1968889$$uhttps://infoscience.epfl.ch/record/126029/files/Hydro%20Elastic%20Behavior%20of%20Vibrating%20Blades.pdf?subformat=pdfa$$xpdfa
000126029 909C0 $$0252135$$pLMH$$xU10309
000126029 909CO $$ooai:infoscience.tind.io:126029$$pconf$$pSTI$$qGLOBAL_SET
000126029 937__ $$aLMH-CONF-2008-024
000126029 973__ $$aEPFL$$rREVIEWED
000126029 980__ $$aCONF