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Cavitation regime detection through Proper Orthogonal Decomposition: dynamics analysis of the sheet cavity on a grooved convergent-divergent nozzle

Article dans une revue avec comité de lecture
Author
DANLOS, Amélie
213739 Laboratoire Génie des Procédés pour l'Environnement, l'Energie et la Santé [LGP2ES]
ccRAVELET, Florent
134975 Laboratoire de Dynamique des Fluides [DynFluid]
ccCOUTIER-DELGOSHA, Olivier
1252 Laboratoire de Mécanique de Lille - FRE 3723 [LML]
ccBAKIR, Farid

URI
http://hdl.handle.net/10985/8543
DOI
10.1016/j.ijheatfluidflow.2014.02.001
Date
2014
Journal
International Journal of Heat and Fluid Flow

Abstract

The unsteady character of the sheet cavity dynamics on the suction side of hydrofoils, on convergent–divergent nozzles or on blades in turbines and propellers is responsible for many issues like erosion, noise and vibrations. This two-phase flow dynamics is investigated using a robust method based on Proper Orthogonal Decomposition (POD). This method is applied to sequences of sheet cavity images, in order to identify the cavitation regimes (sheet cavity or cloud cavitation regimes). Once this method is validated on a reference case, POD calculation is used to evaluate the efficiency of a passive control method. Different longitudinal grooved surfaces are machined on the diverging wall of a Venturi. The grooves geometry allows to change the cavitation regime for a fixed cavitation number, and even to avoid the cloud cavitation shedding, which may damage structures.

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