ABSTRACT

For vessels moving at slower speeds, the frictional resistance contributes up to 80% of the total resistance, demanding a reduction in it. In the BDR/ALS technique, to reduce frictional resistance, the air is injected below the moving body, which is one of the active and interesting research topics. In this work, to reduce the total resistance and the energy required to run a ship, experimental investigations were performed on a 1:23 scaled model of 8000 Tonnes Deadweight Bulk Carrier for a Froude number range of 0.06 to 0.18. For each speed of operation, consequences of different air injection rates of 0.5 to 3.0 CFM, and different sizes of injection holes were thoroughly investigated. With the injection holes of 2mm and 1mm in diameter, the maximum savings in the energy of 29.2% and 25.1% were observed at the Froude numbers of 0.09 and 0.11, respectively.

摘要

对于以较慢速度行驶的船舶，摩擦阻力占总阻力的 80% 以上，需要减少它。在BDR/ALS技术中，为了减少摩擦阻力，将空气注入运动体下方，这是目前活跃且有趣的研究课题之一。在这项工作中，为了减少船舶运行所需的总阻力和能量，我们对 8000 吨载重吨散货船的 1:23 比例模型进行了实验研究，其弗劳德数范围为 0.06 至 0.18。对于每种运行速度，对 0.5 至 3.0 CFM 的不同空气喷射率和不同尺寸的喷射孔的后果进行了彻底调查。对于直径为 2mm 和 1mm 的喷射孔，在弗劳德数 0.09 和 0.11 处观察到的最大能量节省为 29.2% 和 25.1%，