Performance of the Patrol Icebreaker “TESHIO” in Ice-Covered Waters

Abstract

The problem of propeller-ice interaction is very important for ice going vessels, and this phenomenon is not cleared yet. Since the classical works of Jagodkin in 1963, some calculation models have been presented, but none of them can be widely accepted. One of this reason is that quite a few full-scale measurement data used to verify a model can be seen. Besides, the nozzle propeller has been used for propulsion system of icebreaker recently because of its excellent features, but full-scale measurement data of the nozzle propeller are rare.This paper describes the results of full-scale data of nozzle propeller concerning propeller-ice interaction. These data were obtained in the full-scale trials of the patrol icebreaker “TESHIO”, which were conducted in the sea of Okhotsk in February 1996. Some strain gauges were attached on the port side shaft, so the regular component and the fluctuations component of shaft thrust, shaft torque and shaft revolution were measured while the ship was going in ice sea. The maximum fluctuations component of shaft horsepower (SHP) was almost as same as the regular component of SHP. The interval of interaction was also proportional to the regular component of SHP. The comparison on the interval of interaction between full scale data and model test data were also shown. It shows the same tendency that the interval of interaction was shorter as the ice thickness become thicker.