Investigation of Hydrodynamic Performance of High-Speed Craft Rudders via Turbulent Flow Computations, Part I: Non-Cavitating Characteristics

This paper focuses on the numerical analysis of non-cavitating hydrodynamic characteristics of practical rudders used for high-speed crafts, which is valid in the low-speed region. The force and moment acting on rudder are calculated by integrating the shear force and pressure force on the rudder surface, which are obtained from the turbulent flow calculation around rudder. The non-cavitating hydrodynamic characteristics of NACA rudders, as well as rudders using simple profiles, are computed and then compared. Three non-dimensional coefficients, the lift, drag and stock moment coefficient of rudder, are evaluated to investigate the influences of profile shape and profile thickness. The influences of rudder's geometrical parameters on the stall characteristics are also discussed. According to the predicted results, the location of maximum thickness is the most important factor to influence the non-cavitating hydrodynamic characteristics. For all studied rudders, the thicker rudder generates larger stock moment despite of the profile difference.

並列關鍵字

high-speed craft rudder ； non-cavitating hydrodynamic characteristics ； turbulent flow computation ； computational fluid dynamics

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