Abstract
Velocity field around a ship cavitating propeller is investigated based on the viscous multiphase flow theory. Using a hybrid grid, the unsteady Navier-stokes (N-S) and the bubble dynamics equations are solved in this paper to predict the velocity in a propeller wake and the vapor volume fraction on the back side of propeller blade for a uniform inflow. Compared with experimental results, the numerical predictions of cavitation and axial velocity coincide with the measured data. The evolution of tip vortex is shown, and the interaction between the tip vortex of the current blade and the wake of the next one occurs in the far propeller wake. The frequency of velocity signals changes from shaft rate to blade rate. The phenomena reflect the instability of propeller wake.
Highlights
Noise and hull vibration induced by the propeller, especially cavitation noise and attenuation of hydrodynamic performance due to the propeller cavitation, has become a very important problem with the increase of ship load
The prediction of E779A hydrodynamic performance coincides with experimental results
The numerical prediction of the forming and development of the sheet cavitation agrees with the experimental results
Summary
Noise and hull vibration induced by the propeller, especially cavitation noise and attenuation of hydrodynamic performance due to the propeller cavitation, has become a very important problem with the increase of ship load. Acquiring the whole information of flow field around the propeller is helpful to understand the forming of the vibration and the noise, which is significant to analyze noise characteristics. The instability mechanism of propeller slipstream tube due to blade-to-blade interaction was analyzed. The mechanisms of evolution of propeller tip and hub vortices in the transitional region and the far field were investigated experimentally [2]. The interaction mechanisms of the vortices shed by a single-screw propeller with a rudder installed in its wake were addressed [3]. Their attention was 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
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