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

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2014
auteur(s) Danlos Amélie; Ravelet Florent; Coutier Delgosha Olivier; Bakir Farid
journal (abréviation) International Journal of Heat and Fluid Flow (Int J Heat Fluid Flow)
volume (numéro) 47
pages 9 – 20
résumé 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.
mots clés Proper Orthogonal Decomposition; Sheet cavity; Cloud cavitation; Passive control; Distributed organized roughness; Venturi-type section
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