Numerical estimation of cavitation intensity
| Autor: | A Archer, L Krumenacker, R Fortes-Patella |
|---|---|
| Přispěvatelé: | Laboratoire des Écoulements Géophysiques et Industriels [Grenoble] (LEGI), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), EDF (EDF), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF) |
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Engineering
business.industry Turbulence Implosion 02 engineering and technology Mechanics Computational fluid dynamics [SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph] 01 natural sciences 010305 fluids & plasmas [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph] Physics::Fluid Dynamics [SPI]Engineering Sciences [physics] 020303 mechanical engineering & transports 0203 mechanical engineering Macroscopic scale Cavitation 0103 physical sciences Turbomachinery Geotechnical engineering business Intensity (heat transfer) Body orifice ComputingMilieux_MISCELLANEOUS |
| Zdroj: | IOP Conference Series: Earth and Environmental Science IOP Conference Series: Earth and Environmental Science, IOP Publishing, 2014, 22 (5), pp.052014. ⟨10.1088/1755-1315/22/5/052014⟩ |
| ISSN: | 1755-1307 1755-1315 |
| DOI: | 10.1088/1755-1315/22/5/052014⟩ |
| Popis: | Cavitation may appear in turbomachinery and in hydraulic orifices, venturis or valves, leading to performance losses, vibrations and material erosion. This study propose a new method to predict the cavitation intensity of the flow, based on a post-processing of unsteady CFD calculations. The paper presents the analyses of cavitating structures' evolution at two different scales: • A macroscopic one in which the growth of cavitating structures is calculated using an URANS software based on a homogeneous model. Simulations of cavitating flows are computed using a barotropic law considering presence of air and interfacial tension, and Reboud's correction on the turbulence model. • Then a small one where a Rayleigh-Plesset software calculates the acoustic energy generated by the implosion of the vapor/gas bubbles with input parameters from macroscopic scale. The volume damage rate of the material during incubation time is supposed to be a part of the cumulated acoustic energy received by the solid wall. The proposed analysis method is applied to calculations on hydrofoil and orifice geometries. Comparisons between model results and experimental works concerning flow characteristic (size of cavity, pressure,velocity) as well as pitting (erosion area, relative cavitation intensity) are presented. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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