An analytical method which is based on the Lagally steady-motion theorem is presented for the numerical calculation of thrust deduction for body and propeller systems. It is assumed that the influence of a propeller on a hull is mainly potential in origin, whereas the influence of the hull on the propeller is essentially viscous in origin. In the method, a lifting-line representation is used for the propeller, the potential flow due to the hull is obtained from the Douglas-Neumann program and experimental data, and the real total wake is determined experimentally. Thrust deduction computations for a bare hull submarine and an appended submarine, and a low-speed single-screw surface ship are in good agreement with the thrust deduction derived from propulsion tests of these vehicles. (Author)
Analytical Prediction of Thrust Deduction for Submarines and Surface Ships
1968
36 pages
Report
No indication
English
Marine Engineering , Naval vessels , Propellers(Marine) , Thrust , Submarines , Ships , Mathematical prediction , Velocity , Underwater propulsion , Surface propulsion , Control surfaces , Hulls(Marine) , Potential energy , Viscosity , Numerical methods and procedures , Interactions , Wake , Correlation techniques , Model tests
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