Abstract
One of the important things in a ship’s rudder design is the incidence angle of the rudder inflow to improve rudder cavitation performance. In the present study, the rudder inflow is measured by a 3-D LDV (laser Doppler velocimetry) system in a large cavitation tunnel, where the ship model tests are performed at a rather high Reynolds number of 107~108. Through the evaluation of the transverse velocity component using water injection experiments in the test section, the reliability of the 3-D LDV measurements is confirmed. The three-dimensional velocity components of rudder inflow between the rudder and propeller are successfully measured and are compared with numerical simulation results to see good agreement. The incidence angle distribution of the rudder inflow is obtained from the 3-D velocity components and shows a large angle at the range of 0.5 < Z/Span < 0.9, where the cavitation mainly occurred. The asymmetry-type rudder proposed based on rudder inflow measurements showed outstanding improvement of cavitation performance, compared with the flat-type rudder.
Highlights
The rudder provides a ship with directional stability, maneuverability, and control performance
The rudder inflow formed behind a propeller attached to a ship model was investigated by the 3-D LDV system in a large cavitation tunnel
The three-dimensional velocity components of the rudder inflow were coincidently measured by the 3-D LDV system placed outside the test section, which was conducted in the large cavitation tunnel for the first time in the world
Summary
The rudder provides a ship with directional stability, maneuverability, and control performance. Investigated the hydrodynamic performance of a semi-spade rudder operating at different advance coefficients of the propeller They tested the dependence of RANS-based turbulence models on the propeller–rudder interaction in terms of integral forces and local flows. It should be noted that the rotation flow of the propeller must be directly analyzed using dynamic mesh techniques in order to precisely analyze the interaction flow With reference to these previous research works, the current numerical analyses considered the full appended ship model installed in the cavitation tunnel for mesh generation and directly solved the propeller flow using the sliding mesh method applied to the propeller.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
