| Summary: | 碩士 === 國立海洋大學 === 造船工程學系 === 87 === The purpose of this thesis is to develop a coupled viscous/potential flow calculation to the analysis and design of propellers in the stern flow. Namely, the interaction between the ship hull and the propeller is calculated by coupling the viscous flow solution of the ship hull and the potential flow solution of the propeller. The propeller performance is dramatically affected by the presence of the hull while operated in the thick boundary layer generated by a ship hull, and this problem has long been investigated by using various methods. In this thesis, the related works done in the past have been reviewed and commented in this thesis, and the “equivalent body force” concept originally presented by Kerwin in 1994 is used in this thesis. The “equivalent body force” concept is used to correctly transfer the propeller force between the viscous flow and the potential flow assumptions. The numerical procedure based on this concept is established to the analysis of an axis-symmetric body with a propeller, and it is further extended to the analysis of flow around a fully three-dimensional ship with a propeller. It is found that the accurate calculation of the propeller induced velocity is critical to the results. The concept and numerical procedure adopted in the analysis problem are then applied to the design of propellers in the effective inflow. The results in both the analysis and design cases are reasonable and promising. Therefore, the works accomplished in this thesis can be further developed to the analysis and design of more advanced propulsion systems.
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