Propeller tip and hub vortex dynamics in the interaction with a rudder |
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Authors: | Mario Felli and Massimo Falchi |
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Institution: | (1) CNR-INSEAN, Italian Ship Model Basin, Via di Vallerano 139, 00128 Rome, Italy |
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Abstract: | In the present paper, the interaction mechanisms of the vortices shed by a single-screw propeller with a rudder installed
in its wake are addressed; in particular, following the works by Felli et al. (Exp Fluids 6(1):1–11, 2006a, Exp Fluids 46(1):147–1641, 2009a, Proceedings of the 8th international symposium on particle image velocimetry: Piv09, Melbourne, 2009b), the attention is focused on the analysis of the evolution, instability, breakdown and recovering mechanisms of the propeller
tip and hub vortices during the interaction with the rudder. To investigate these mechanisms in detail, a wide experimental
activity consisting in time-resolved visualizations, velocity measurements by particle image velocimetry (PIV) and laser Doppler
velocimetry (LDV) along horizontal chordwise, vertical chordwise and transversal sections of the wake have been performed
in the Cavitation Tunnel of the Italian Navy. Collected data allows to investigate the major flow features that distinguish
the flow field around a rudder operating in the wake of a propeller, as, for example, the spiral breakdown of the vortex filaments,
the rejoining mechanism of the tip vortices behind the rudder and the mechanisms governing the different spanwise misalignment
of the vortex filaments in the pressure and suction sides of the appendage. |
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