Propulsion Experiments with Tandem Propellers Designed for Large High Speed Cargo Ship

摘要

A program for investigating hydrodynamic aspects of energy conservation for commercial ships is in progress at the David Taylor Naval Ship R&D Center (DTNSRDC). As part of this program, the propulsion performance of the MARAD high speed container ship model 5218, with design tandem propellers, was measured with both a transmission dynamometer and in-hub dynamometers in separate experiments. A comparison between the two experimental results shows very close agreement. The individual thrust and torque contributions of the forward and aft propeller were determined and compared to the design target thrust and torque. The design tandem propeller showed a 4.4 percent decrease in delivered power relative to the stock tandem propeller and a 6.6 percent decrease relative to the prognosis for design of a single screw configuration.