全回转推进器螺旋桨桨叶结构强度评估方法

为了解决全回转推进器螺旋桨的单向流固耦合问题，实现螺旋桨桨叶结构强度精确评估，文章基于计算流体力学和有限元法开展了螺旋桨桨叶的结构强度计算方法研究，重点探讨了桨叶表面随机分布压力从流体域到固体域的转换技术。在此基础上，文中提出了桨叶固液交界面上水动力载荷的转换方法，详细研究了插值加权系数和有限元网格尺寸对桨叶结构强度计算精度的影响规律，给出了适用于桨叶强度评估的插值加权系数和单元网格尺寸选取原则。最后，该文以5000 kW级全回转推进器螺旋桨为例，开展了桨叶结构强度数值计算和安全评估，获得了桨叶的应力和变形分布规律，整体上建立了全回转推进器螺旋桨桨叶结构强度评估方法，可为大功率全回转推进器螺旋桨设计提供借鉴和参考。

Structural Strength Evaluating Method of the Azimuth Thruster Propeller Blade

In order to achieve a precise structural strength evaluation for the azimuth thruster pro-peller blade, a detailed study is conducted by Computational Fluid Dynamics (CFD) and Finite Ele-ment Method (FEM). To solve the problem of unidirectional fluid-structure coupling of the propeller, the method of transferring distributed pressure from fluid field to structure field on the blade surface is mainly discussed. Then a transmission method for fluid pressure on the fluid-structure interface is proposed, and suitable principles of selecting weighting coefficients and element size which impact numerical calculation accuracy are presented. On this basis, strength numerical calculation and safety evaluation of a 5 000 kW azimuth thruster propeller are carried out, and the stress and deformation distribution laws of the propeller are obtained. Finally, the structural strength evaluating method of the azimuth thruster propeller blade is established, which can provide a technical guidance for the de-sign of high-powered azimuth thruster propellers.