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A THEORY FOR THE PROPELLER-RUDDER INTERACTION
STEVENS INST OF TECH HOBOKEN NJ HOBOKEN
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The propeller-rudder interaction problem is studied by means of the unsteady lifting-surface theory. Both surfaces of arbitrary geometry are immersed in a nonuniform flowfield i.e., hull wake of an ideal incompressible fluid. The boundary-value problem yields a pair of surface integral equations, the inversion of which is achieved by the so-called generalized lift operator technique, a new approach developed by the authors, in conjunction with the presently used mode-collocation method. The analysis demonstrates the mechanism of the interaction phenomenon by exhibiting the filtering effects of the propeller on the harmonic constituents of the wake which allow the rudder to be exposed only to the blade harmonic and multiples thereof. A numerical procedure adaptable to the CDC 6600 computer was developed which furnishes information about 1 the steady and time-dependent pressure distribution on both lifting surfaces, and 2 the resultant hydrodynamic force and moments. A limited number of calculations exhibits the importance of some parameters such as axial clearance, number of blades, and harmonic components of the hull wake.
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