基于FEM/CFD方法的桨-轴系统双向流固耦合特性数值模拟研究  

Numerical study on two-way fluid-structure coupling characteristics of propeller-shafting system based on FEM/CFD method

作　　者：孟长霖 简洁 董烈祎 率志君[1] 姜晨醒 倪世威 李玩幽[1] MENG Chang-lin;JIAN Jie;DONG Lie-yi;SHUAI Zhi-jun;JIANG Chen-xing;NI Shi-wei;LI Wan-you(College of Power and Energy Engineering,Harbin Engineering University,Harbin 150001,China;College of Energy,Xiamen University,Xiamen 361102,China)

机构地区：[1]哈尔滨工程大学动力与能源工程学院,哈尔滨150001 [2]厦门大学能源学院,福建厦门361102

出　　处：《船舶力学》2024年第11期1780-1792,共13页Journal of Ship Mechanics

基　　金：国家自然科学基金资助项目(52241101)。

摘　　要：船舶航行时螺旋桨产生的激励力会引起推进轴系振动,而轴系振动也会对螺旋桨产生反馈,引起复杂空间运动,桨-轴系统中存在着双向流固耦合问题。为了研究这种复杂动力学特性,本文基于有限元(FEM)和计算流体力学(CFD)方法,建立能够模拟轴系多自由度振动与螺旋桨粘性流场耦合的数值模型,在流场求解器中进行二次开发实现双向耦合的迭代求解,并进行多个算例的模拟来研究流体激励与振动响应的变化规律。结果表明:本文提出的方法具有实用价值,采用该方法进行双向流固耦合分析时收敛性与精度满足工程要求,求解速度较快且无需附加的计算资源;双向耦合效应与质量不平衡对轴频处的幅值有较大影响,而非均匀来流对叶频处的幅值有较大影响。The exciting forces generated by the propeller during ship operation will cause the vibration of propulsion shafting,and the shafting vibration will also have feedback to the propeller,causing complex spa⁃tial motion.There is a two-way fluid-structure coupling problem in the propeller-shafting system.To investi⁃gate this complex dynamic problem,the numerical model for simulating the coupling of shafting multi-de⁃gree-of-freedom vibration and propeller viscous flow field was established in this paper,based on the finite element(FEM)and computational fluid dynamics(CFD)methods.The iterative solution of the two-way cou⁃pling was realized by carrying out secondary development in the flow field solver,and several numerical ex⁃amples were simulated to study the variation characteristics of fluid exciting and vibration response.The re⁃sults show that,the simulation method proposed in this paper has practical values,and the convergence and accuracy of the two-way fluid-structure coupling simulation can meet the engineering requirements.The computing speed for solving the coupling system of this method is fast,and no additional computing resourc⁃es are required.The two-way coupling effect and unbalanced mass have significant influence on the ampli⁃tudes at rotating frequency while the non-uniform inflows have significant influence on the amplitudes at blade passing frequency.

关 键 词：推进轴系 船舶螺旋桨 双向流固耦合 质量不平衡 非均匀来流 

分 类 号：U664.21[交通运输工程—船舶及航道工程]