Abstract: To accurately evaluate the energy-saving performance of a pre-swirl duct (PSD) and reveal its underlying mechanisms, this study takes an 8,800 TEU container ship as the research subject. Numerical simulations of ship model resistance, propeller open-water performance, and self-propulsion performance were performed using the Reynolds-averaged Navier-Stokes (RANS) method. The numerical method was validated against towing tank test results. Based on this, the primary energy-saving mechanisms were systematically revealed by analyzing the effects of the PSD on the wake field, propeller performance, and wake kinetic energy. At the design speed, the predicted energy-saving rates are 2.78% (CFD) and 2.74% (EFD). Under off-design conditions, the average rates are 2.86% (CFD) and 2.72% (EFD), showing good agreement between predictions and experiments. The PSD generates a pre-swirl flow via its guide fins, which optimizes the propeller inflow, improves blade performance, and suppresses transverse flow in the wake. The accurate numerical method and the systematic analysis of energy-saving mechanisms presented in this study provide a foundation for future optimization of PSDs.

Key words: pre-swirl duct (PSD), container ship, computational fluid dynamics (CFD), model tests, energy-saving mechanisms

摘要： 为准确评估导管鳍的节能效果并揭示其节能机理,该文以1艘8 800 TEU集装箱船为研究对象,基于RANS方法进行船模阻力、螺旋桨敞水及自航性能的数值计算,并通过对比拖曳水池试验与数值计算结果,验证了该方法的准确性。在此基础上,该文通过分析导管鳍对尾流场、螺旋桨性能及尾流动能的影响,系统阐明了其主要节能机理。研究结果表明：在设计航速下,导管鳍节能率预报值分别为2.78%（计算流体力学方法）和2.74%（试验流体力学方法）;非设计工况下,两者的平均节能率分别为2.86%和2.72%,预报与试验结果吻合良好。导管鳍通过导叶产生预旋流,优化了螺旋桨的入流条件,改善了桨叶的性能,并有效抑制了尾流中的横向流动。该文所提出的高精度数值预报方法及对导管鳍节能机理的系统分析,可为后续导管鳍节能效果优化提供技术支撑。

关键词: 导管鳍, 集装箱船, 计算流体力学, 模型试验, 节能机理