Abstract Pre-deformation design can improve the propulsive efficiency of composite ship propellers under off-design conditions, where propulsive efficiency is related to the geometry of the propeller blade. Material attributes affect the deformation of composite propeller blades, suggesting that these also affect the propulsive efficiency of a pre-deformed composite propeller (PDCP) under off-design conditions. In this study, the hydrodynamic performance and structural response of composite propellers were determined and verified using computational fluid dynamics and the finite element method. The effects of elastic and shear moduli on propulsive efficiency and structural deformation were analyzed, and the influences of changing material attributes and propeller advance ratios were compared. Based on existing propeller theories, an objective function was proposed for selecting the most suitable material attribute scheme for the DTNSRDC 4383 propeller, from 18 different materials. Such a selection allows for an optimization of the comprehensive propulsive efficiency of a composite propeller through pre-deformation design. The results show that when the PDCP has an elastic modulus E = 135 GPa and a shear modulus G = 2.07 GPa, it exhibits optimal comprehensive propulsive efficiency. The findings of this study can be used in the design of composite propellers to maximize performance under a broad range of working conditions.

中文翻译：

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提高非设计条件下复合材料螺旋桨的推进性能

摘要 预变形设计可以提高复合材料船舶螺旋桨在非设计条件下的推进效率，其中推进效率与螺旋桨叶片的几何形状有关。材料属性会影响复合螺旋桨叶片的变形，这表明这些也会影响预变形复合螺旋桨 (PDCP) 在非设计条件下的推进效率。在这项研究中，使用计算流体动力学和有限元方法确定和验证了复合螺旋桨的水动力性能和结构响应。分析了弹性模量和剪切模量对推进效率和结构变形的影响，比较了材料属性和推进比变化的影响。基于现有的螺旋桨理论，提出了一个目标函数，用于从 18 种不同材料中为 DTNSRDC 4383 螺旋桨选择最合适的材料属性方案。这种选择允许通过预变形设计优化复合螺旋桨的综合推进效率。结果表明，当PDCP的弹性模量E = 135 GPa和剪切模量G = 2.07 GPa时，其综合推进效率最佳。这项研究的结果可用于复合材料螺旋桨的设计，以在广泛的工作条件下最大限度地提高性能。这种选择允许通过预变形设计优化复合螺旋桨的综合推进效率。结果表明，当PDCP的弹性模量E = 135 GPa和剪切模量G = 2.07 GPa时，其综合推进效率最佳。这项研究的结果可用于复合材料螺旋桨的设计，以在广泛的工作条件下最大限度地提高性能。这种选择允许通过预变形设计优化复合螺旋桨的综合推进效率。结果表明，当PDCP的弹性模量E = 135 GPa和剪切模量G = 2.07 GPa时，其综合推进效率最佳。这项研究的结果可用于复合材料螺旋桨的设计，以在广泛的工作条件下最大限度地提高性能。