Abstract
The idea of using cargo pumps to improve the low-speed maneuverability of tankers is evaluated. The main drawback of this system is the high kinetic energy loss in the jets, which results in an unfavorable thrust-to-installed-pump-power ratio. To improve the system, the exit velocity can be lowered, and the mass flow rate can be increased, by mounting the nozzles in contoured tunnels with open ends at both sides of the ship (ejector principle). Theory and experimental data derived from a large-scale experimental setup indicate that the performance of an ejector system for thrust generation is between the capability of a conventional screw-driven thruster and a radial pump-driven system with convergent nozzle.
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