Abstract Compared to metals, composite materials have many advantages such as lightweight, high strength-to-weight ratio, and reduced noise properties. The anisotropic nature of carbon fiber reinforced plastic (CFRP) with different stacking sequences and fiber angles can be used to build a composite propeller with enhanced hydrodynamic and mechanical properties. The primary objective of this paper is to analyze the influence of the tip clearance on a composite ducted propeller using the bi-directional fluid-structure interaction (FSI) method. Several finite element models with different stacking sequences and ply orientations of the propeller are analyzed. An acceptable layup for the composite blade is found. A comparative study is presented to compare different tip clearances for the composite ducted propeller and with a metallic one. The change of thrust, torque, efficiency, pressure distribution, deformation and twist angle are presented. An optimized result for the gap-to-span ratio (GSP) 0.417 is selected as the best compromise between energy-saving and safety factor against damage.

中文翻译：

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用于预测叶尖间隙对复合导管螺旋桨影响的双向流固耦合

摘要 与金属相比，复合材料具有重量轻、强度重量比高、噪声降低等诸多优点。具有不同堆叠顺序和纤维角度的碳纤维增强塑料 (CFRP) 的各向异性特性可用于构建具有增强的流体动力学和机械性能的复合螺旋桨。本文的主要目的是使用双向流固耦合 (FSI) 方法分析叶尖间隙对复合导管螺旋桨的影响。分析了具有不同堆叠顺序和螺旋桨层片方向的几个有限元模型。找到了复合叶片的可接受的叠层。提出了一项比较研究，以比较复合管道螺旋桨和金属螺旋桨的不同叶尖间隙。给出了推力、扭矩、效率、压力分布、变形和扭转角的变化。选择间隙跨度比 (GSP) 0.417 的优化结果作为节能和防止损坏的安全系数之间的最佳折衷。