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This paper presents selected results from a three-year Office of Naval Research-funded project directed at developing technology for integrated water jet propulsion systems. This involved the development and validation of prediction tools for the design, computational evaluation, and experimental assessment of a specific application of water jet propulsion to a small Navy ship. With the choice of an existing well-suited hull form of convenience, the baseline design included the determination of overall water jet system operational parameters, design geometry of the inlet and ducting, and design of an axial-flow water jet pump. Numerical flow computations using potential flow and RANS computer codes were used to evaluate flow details at every stage. Model hull and twin water jet propulsion units were constructed according to the design created for the project. An extensive ship model powering test was carried out in the large towing basin at NSWCCD, featuring the collection of force, velocity distributions, and pressure data needed to apply the ITTC momentum and energy flux performance analysis method. Detailed propulsion results for thrust and jet system power are presented for the case of the 25-knot design speed (Fn = 0.6) of the baseline ship hull. |
