碩士 / 國立臺灣海洋大學 / 系統工程暨造船學系 / 102 / In this thesis, the interactions among rudders, propellers and ship hulls are investigated. The works include computations of rudders in the free stream, rudders and propellers in the free stream, and then rudders and propellers in ship wakes. The variations of the forces and flow field are studied, and both the conventional and energy-saving rudders are considered. The single rudder is first computed by both the viscous flow method and the potential flow method. The commercial software STAR-CCM+ is used for viscous flow RANS computations, and the self-developed boundary element method, RUDPAN, is adopted for the potential flow computations. Both methods give a good prediction comparing to the experimental data at different angles of attack. The simulation of the rudder with a propeller is then carried out by both methods. The results from both methods show that the rudder performance is improved and the stall angle is postponed because the propeller accelerates the inflow of rudder. In this simulation, the potential flow method cannot accurately describe the rudder forces at different rudder angles with a propeller, and the reason is that the interaction in the potential flow method is taken circumferential mean values. Finally, the ship hull is considered in the simulations to fully consider the interaction among the rudders, propellers and hulls. The presented method in this thesis is then applied to evaluate three different types of rudders, and they are a conventional rudder, a twist rudder with a rudder bulb, and a twist rudder with a rudder bulb and rudder fins. The computational results from both the rudder/propeller simulations and rudder/propeller/hull simulations all agree with the experimental trend. Furthermore, the computational forces and flow filed results can assist us to understand how the energy-saving devices work. The major achievement of this thesis work is to establish an effective analysis method for evaluating the rudder performance; however, this analysis method can also be used to improve the designs of conventional and energy-saving rudders.
| Identifer | oai:union.ndltd.org:TW/102NTOU5345007 |
| Date | January 2014 |
| Creators | Chen, Tung-Ching, 陳東慶 |
| Contributors | Hsin, Ching-Yeh, 辛敬業 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 114 |
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