Twisted rudder for reducing fuel-oil consumption

Twisted rudder for reducing fuel-oil consumption

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Three twisted rudders fit for large container ships have been developed; 1) the Z-twisted rudder that is an asymmetry type taking into consideration incoming flow angles of the propeller slipstream, 2) the ZB-twisted rudder with a rudder bulb added onto the Z-twisted rudder, and 3) Handbags the ZB-F twisted rudder with a rudder fin attached to the ZB-twisted rudder.The twisted rudders have been designed computationally with the hydrodynamic characteristics in a self-propulsion condition in mind.The governing equation is the Navier-Stokes equations in an unsteady turbulent flow.The turbulence model applied is the Reynolds stress.

The calculation was carried Frame Parts out in towing and self-propulsion conditions.The sliding mesh technique was employed to simulate the flow around the propeller.The speed performances of the ship with the twisted rudders were verified through model tests in a towing tank.The twisted versions showed greater performance driven by increased hull efficiency from less thrust deduction fraction and more effective wake fraction and decreased propeller rotating speed.