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<p>In this study, the influences of the air injection pattern in the air lubrication system on the drag reduction and propulsive performance of a ship are explored via the numerical simulation method. This is part of the development of a system that aims to increase the greenhouse gas emission reduction effect of air lubrication in actual operation by controlling the air injection pattern according to real-world weather and sea conditions and hull motion. The greater the drag reduction caused by bubbles, the greater is the energy-saving effect, although the propulsive efficiency&#xa0;is affected by the resulting changed in the wake field. The void fraction distribution at the propeller disc also differs depending on the air injection pattern. Therefore, the air injection pattern in the air lubrication system of ships should be regarded as a balance among the drag reduction effect, the propulsive efficiency, and the void fraction at the propeller disc.</p>

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Influence of the air injection pattern in the air lubrication system on the propulsive efficiency of ships

  • 期刊论文

  • 发表日期：

    2026年3月31日

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  • Daijiro Arakawa,
  • Hideki Kawashima,
  • Koichiro Shiraishi,
  • Naoto Sogihara

摘要

In this study, the influences of the air injection pattern in the air lubrication system on the drag reduction and propulsive performance of a ship are explored via the numerical simulation method. This is part of the development of a system that aims to increase the greenhouse gas emission reduction effect of air lubrication in actual operation by controlling the air injection pattern according to real-world weather and sea conditions and hull motion. The greater the drag reduction caused by bubbles, the greater is the energy-saving effect, although the propulsive efficiency is affected by the resulting changed in the wake field. The void fraction distribution at the propeller disc also differs depending on the air injection pattern. Therefore, the air injection pattern in the air lubrication system of ships should be regarded as a balance among the drag reduction effect, the propulsive efficiency, and the void fraction at the propeller disc.