Phase average LDV measurements of the propeller-rudder-hull interaction (Contributo in atti di convegno)

Type
Label
  • Phase average LDV measurements of the propeller-rudder-hull interaction (Contributo in atti di convegno) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
Alternative label
  • E. Binotti, M. Felli, F. Di Felice (2008)
    Phase average LDV measurements of the propeller-rudder-hull interaction
    in AIVELA National Meeting, 16th, Napoli, 1-2 Dicembre 2008
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • E. Binotti, M. Felli, F. Di Felice (literal)
Note
  • PuMa (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • I.N.S.E.A.N., Italian Ship Model Basin-Propulsion and Cavitation Laboratory (literal)
Titolo
  • Phase average LDV measurements of the propeller-rudder-hull interaction (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#isbn
  • 9788896378113 (literal)
Abstract
  • Nowadays, the problem of the hydrodynamic-induced noise and vibrations is an issue of relevance in both the navy and civil naval engineering in view of the need of reducing the vessel signature and the on-board comfort. In this scenario, the perturbation induced by a marine propeller and its interaction with the hull and the ship appendages are the strongest noise sources on a ship typically in which the inflow quality on the propeller, the dynamic of the propeller tip and hub vortices, the mechanisms of the propeller wake instability and breakdown represent key aspects towards which concentrate the efforts for the performance improvement and the signature reduction. In this scenario, the accurate characterization of the flow features in the stern region of a ship is a complex task that has implied a rising interest in detailed numerical and experimental tools to be used for both new design approaches as well as to get a better insight into the complex mechanism of interaction among the propeller slipstream, the hull and the rudder. Here, the study of the propeller induced perturbation dealt with LDV velocity measurements upstream and downstream the propulsor. Measurements were performed in the large cavitation tunnel of INSEAN on a dummy model of a twin screw vessel of about 7m length.More specifically velocity field was measured along a vertical longitudinal plane spread out all along the stern region of the model and a number of transversal planes in front and behind the propeller disk and the rudder. In addition, phase averaged velocity measurements along the face and the back surfaces of the rudder were performed.Some illustrative results of the study are reported hereinafter. Figure 1 documents some typical features of the interaction between the vortical structures of the propeller wake and the rudder through the representation of the phase averaged mean and turbulent components of the velocity and the vorticity field. Note the complex deformation of the propeller wake while crossing the rudder wake and the dramatic drop off of the phase averaged tip vortex vorticity downstream the rudder due to the process of energy transfer from the mean flow to other contributions (i.e. turbulence, noise, vibrations, heat). (literal)
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