Interference between a Hull and a Stern-Mounted Ducted Propeller

摘要

A hydrodynamic analysis has been made of an underwater hull and a stern-mounted ducted propeller in steady axially symmetric flow. Singularity distributions are used to represent a typical hull, the hull wake, a thin cambered duct, and the propeller. The propeller is approximated by an actuator disk which adds a uniform velocity to the slipstream. Duct camber lines are chosen to minimize duct leading-edge suction, the hull-duct interference force, and separation of the duct boundary layer. The potential flow field, duct boundary layer, and interference forces are all predicted versus: duct length, duct thrust, duct loading distribution, and Reynolds number. As an aid in the design or selection of an experimental propeller, its inflow, loading, and power are estimated.