Ice channel breakout performance of a double-acting vessel
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2024-02-01
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Language
en
Pages
9
Series
Ocean Engineering, Volume 293
Abstract
The capability of an icegoing ship to break out from an ice channel is a main index of its manoeuvrability in ice. Breakout is necessary if a ship needs to change its course when sailing in an ice channel. Breakout can also be used as an evasive action to avoid collision with the leading ship in emergencies during escort and convoy. Although the ice channel breakout test is documented in ITTC guidelines as a standard manoeuvring test, little data is available on the performance of icegoing ships in this context. This paper presents model-scale tests carried out at Aalto Ice Tank with a double-acting vessel with podded propulsion. Parameters including ice thickness and strength, ice channel width, initial speed and propulsive settings are varied between the tests to examine their influence on the capability and distance to break out from ice channels. In addition, stopping tests by reversing propeller revolution were conducted in ice channels to benchmark the breakout operation as an option to avoid collision. The test results reveal the influence of multiple factors on the ship's channel-breakout capability, including channel width, shaft power, initial speed, as well as thickness and strength of ice. With additional complementary numerical simulations at high speeds, it is found that for collision avoidance braking is more efficient at low speed and breakout at high speed. Recommendations on breakout test in model scale are given based on the lessons and experience learnt from the experiments.Description
Funding Information: The authors would like to acknowledge the Aalto Ice Tank technicians, Teemu Päivärinta and Lasse Turja, for their skilful work to enable the experiments. The model tests have been funded by the South-eastern Finland–Russia CBC 2014–2020 program via the project Future Potential of Inland Waterways (INFUTURE) . Publisher Copyright: © 2024 The Authors
Keywords
Channel breakout, Icebreaking, Icegoing ships, Manoeuvrability, Model test
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Citation
Li, F, Lu, L, Puolakka, O & Kujala, P 2024, ' Ice channel breakout performance of a double-acting vessel ', Ocean Engineering, vol. 293, 116657 . https://doi.org/10.1016/j.oceaneng.2023.116657