Abstract
An improved wavy twisted rudder (WTR) is proposed based on a previous study. The misalignment of the wavy and propeller centers and the computational work of the previous study are supplemented to determine the effectiveness of the developed wavy twisted rudder. The aligned wavy twisted rudder (AWTR) was also applied to a KRISO container ship (KCS). The resistance, self-propulsion performance, and rudder forces due to the angular variation in the WTR and AWTR were compared using computational fluid dynamics (CFD). The numerical results were compared with the experimental results. The self-propulsion performance of the AWTR was superior to that of the WTR, with an efficiency gain of approximately 0.3% in both the model test and numerical analyses. The effectiveness of the AWTR was demonstrated using CFD; the CFD improved for the WTR in comparison with a conventional twisted rudder, especially at large rudder angles. The stall point of the AWTR was approximately 5° greater than that of the WTR in both directions. The results confirm the superiority of the AWTR in terms of its delayed stall and high lift-to-drag ratio, which was investigated by visualizing the streamline around the rudder. The actual maneuverability, such as the turning circle, realized with AWTR shall be compared with that realized with a WTR and conventional TR in the near future.
Highlights
As environmental conditions have become highly unpredictable, the safety and reliability of ship operations have acquired unprecedented significance
Rudder Force Results the rudder performances of the wavy twisted rudder (WTR) and aligned wavy twisted rudder (AWTR) are compared through model tests and numerical computations
The performance of the AWTR was verified through model tests and numerical analyses
Summary
As environmental conditions have become highly unpredictable, the safety and reliability of ship operations have acquired unprecedented significance. Research on the development of rudders with superior maneuverability is essential, especially in rough seas Special rudders such as flaps and schilling rudders have been developed to improve performance by delaying the stall point and producing a high lift. Kim et al [5] studied the maneuvering performance and turning ability using a numerical method in shallow and deep-sea conditions based on the increase in the performance of the rudder. A comparative study was conducted with a conventional (semi-spade) and special rudder (flap) for the same full-scale ships, as displayed in Figure 1 [8]. Maneuvering performances such as the zig-zag and stops were compared to determine the effectiveness of the special rudder. Liu et al [9] analyzed the influences of the three major properties of a
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