Abstract: Thicken measure is conducted to effectively take advantage of composite propellers’ characteristics of light and deformation. On the basis of hydrodynamic performance remained，thicken measure can broaden the cavitation bucket for the adaption to the non-uniform flow and improve the strength of blades. The steady fluid-structure coupling method is applied to calculate the thicken composite propeller lied with 45° and -30° fiber orientation. Then the pre-deformed design method is used to calculate the hydrodynamic performance，profile value parameters and deformation under different working conditions. Under the design condition，the pre-deformation opposite to the deformed direction is imposed to the composite propeller，then its deformed geometry can match to the original profile under pressure load，so is the hydrodynamic performance. Under the off-design conditions，the hydrodynamic performance is improved compared to the original propeller.

Key words: Composite propeller；Middle thicken；Pre-deformed design；Fluid-structure coupling；Open-water performance

摘要： 为有效利用复合材料螺旋桨的轻质和弹性特点，对螺旋桨做了加厚处理，在保证水动力性能的前提下，加宽空泡斗以增强螺旋桨对不均匀流场的适应性，在结构上还会增加复合材料桨叶的强度。采用稳态流固耦合算法，对优选出的加厚桨进行了45°和-30°两种复合材料铺层角度下的流固耦合计算，采用预变形设计方法，计算了不同工况下的敞水性能、型值参数和变形。设计工况下，在复合材料螺旋桨变形的反方向施加预变形量，受力后可变形至原桨的形状，水动力性能也与原桨相当，而在非设计工况下，实现了复合材料螺旋桨的水动力性能改善。

关键词: 复合材料螺旋桨；中部加厚；预变形设计；流固耦合；敞水性能