| Abstract | As part of the development effort to improve the mathematical model for the performance of icebreaking ships with podded propulsors, the National Research Council Canada Institute for Ocean Technology has conducted a series of resistance, propulsion and manoeuvring tests on a scale model of the Korean icebreaker Araon using a Planar Motion Mechanism (PMM). An investigation of the Araon performance characteristics was conducted in open water, level ice and pack ice. Limted tests were also conducted in ridges and rubble ice. With control over propeller shaft speed and PMM motion, the tests included straight, zigzagging and circular runs.
During these runs, PMM loads, model position, pod performance characteristics and ice-hull pressures were monitored. From these measurements, the ship’s icebreaking, manoeuvring, and propulsive capabilities can be forecast and compared with the full-scale ship’s performance.
The focus during testing was the resistance and propulsion in open water and in level and pack ice conditions. These results may be used to develop the nominal wake fractions and thrust deduction factors for the propulsion system.A method has been developed for the calculation of these performance reduction factors and has been implemented for the zero azimuth condition. |
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