ABSTRACT

Reducing the ship’s drag is an effective technique for reducing emissions, operating expenses, and improving EEDI. For slow-moving vessels, frictional resistance has been reported to contribute up to 80% of total resistance, demanding a thorough investigation in reducing it. Air or the gas has been used as a lubricant, to reduce the frictional resistance known as Micro Bubble Drag Reduction, which is the need of a present era. In this paper, the current research scenario on the technique is presented, which suggests a plausible reduction in frictional resistance of 80% for ships. The review suggests that reduction in drag depends on void fraction, coalescence and breaking of injected bubbles, the salinity of water and type of gas used, depth of water in which the bubbles are injected, and of course, on the location of injection points. In the end, recommendations have been provided to improve the drag reduction.

摘要

减少船舶阻力是减少排放、运营费用和提高 EEDI 的有效技术。据报道，对于缓慢移动的船舶，摩擦阻力占总阻力的 80%，需要彻底调查以减少摩擦阻力。空气或气体已被用作润滑剂，以减少摩擦阻力，称为微气泡减阻，这是当今时代的需要。在本文中，介绍了该技术的当前研究方案，这表明船舶的摩擦阻力可能减少 80%。审查表明，阻力的减少取决于空隙率、注入气泡的聚结和破裂、水的盐度和所用气体的类型、气泡注入的水深，当然，还取决于注入点的位置。到底，