Author(s)

A. Pauchet & L. Briangon-Marjollet

Abstract

Recent results on tip vortex cavitation scale effects at high reynolds numbers A. Pauchet & L. Briangon-Marjollet Bassin d'Essais des Carenes, Chaussee du Vexin 27100, Val de Reuil, France ABSTRACT In order to verity the Reynolds extrapolation law on Tip Vortex Cavitation (TVC), basic experiments were conducted in the Grand Tunnel Hydrodynamic (GTH) on two 3.8 area ratio elliptical hydrofoils with a NACA0020 and a N AC A16020 cross sections for Reynolds numbers reaching 8.2x10^ (Pauchet et al. [1]). Critical cavitation numbers, axial and tangential velocity profiles of the tip vortex were measured. The NACA0020 foil displays much larger desinent cavitation numbers as well as larger tangential and axial velocities compared to the NACA16020. This is due to the increase of the lift coefficient, caused by the change of the cross section. The influence of the Reynolds number on TVC and its dependence with the angle of attack of the foil are determined.

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