期刊
OCEAN ENGINEERING
卷 276, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.oceaneng.2023.114164
关键词
Four -screw ship; Propeller bearing force; Oblique flow; Harmonic analysis; Fluctuation amplitude
The present study conducted numerical simulations to investigate the influence of oblique flow on the bearing force performance of a four-screw ship. The findings suggest that the outside propeller wake field is more significantly impacted by a positive drift angle, whereas the effect is reversed for negative drift angles. Both the inside and outside propellers exhibited an increase in propeller axial average loads with an increase in drift angle. Propeller loads with drift angles were observed to be larger than those under straight ahead conditions, with the amplitudes of the inside propeller at negative angles being greater than those at positive angles, likely due to the intense bilge vortex. Notably, the outside propeller demonstrated maximum amplitudes of axial loads at a beta = 10 degrees condition, while the minimum was observed at a beta = - 10 degrees condition.
The present study conducted numerical simulations to investigate the influence of oblique flow on the bearing force performance of a four-screw ship, specifically analyzing the wake field and self-propulsion performance. The characteristics of the wake field and bearing force were compared and analyzed in detail under different drift angles (beta=0 degrees, +/- 10 degrees, and +/- 20 degrees). The findings suggest that the outside propeller wake field is more significantly impacted by a positive drift angle, whereas the effect is reversed for negative drift angles. Both the inside and outside propellers exhibited an increase in propeller axial average loads with an increase in drift angle. The drift angles were found to shift the location of the peak and trough of the single blade unsteady load due to the relative direction of propeller rotation and lateral incoming flow. Propeller loads with drift angles were observed to be larger than those under straight ahead conditions, with the amplitudes of the inside propeller at negative angles being greater than those at positive angles, likely due to the intense bilge vortex. Notably, the outside propeller demonstrated maximum amplitudes of axial loads at a beta = 10 degrees condition, while the minimum was observed at a beta = - 10 degrees condition.
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