船用螺旋桨流固耦合水动力及强度分析

发布时间：2018-05-31 05:48

本文选题：螺旋桨设计 + 水动力性能预报　；参考：《大连海事大学》2016年硕士论文

【摘要】：作为船舶的主要推进装置,螺旋桨与船舶的经济性与安全性密切相关,其设计和性能计算一直是流体力学领域中非常重要的课题。螺旋桨运行过程中,由于水动力载荷的影响会引起螺旋桨桨叶的变形,而桨叶的变形效应会影响螺旋桨的工作性能,而CFD数值模拟无法全面考虑其影响,因此更接近物理现象本身的流固耦合方法已成为螺旋桨设计时需要考虑的问题。本文首先通过图谱法进行螺旋桨设计,之后采用计算流体力学方法(CFD)分析计算设计桨的水动力性能,最后运用流固耦合方法得到螺旋桨桨叶变形及等效应力,具体内容如下：(1)用螺旋桨设计软件分别设计出了一型B4-55与B4-85的螺旋桨,使船舶推进系统的核心问题得到快捷、准确的解决。(2)合理密布关键区域尤其是桨叶上的网格,采用边界层网格技术,保证较高的网格精度,以确保敞水计算中获得精确的结果。(3)借助三维CAD软件生成螺旋桨几何模型,运用CFD方法,对螺旋桨周围流场进行数值模拟,获得设计桨的水动力性能,由此绘出螺旋桨的敞水特性曲线,对螺旋桨流场的流线、速度矢量及压力分布规律等流动特性进行分析。(4)在Workbench下,对螺旋桨进行稳态流固耦合分析。在不同进速系数下,求解设计桨桨叶变形与等效应力分布；分析不同材料下桨叶变形与等效应力的变化规律,其结果可为工程应用和理论研究提供参考。
[Abstract]:As the main propulsion device of the ship, the propeller is closely related to the economy and safety of the ship. Its design and performance calculation have always been a very important subject in the field of hydrodynamics. In the process of propeller operation, the effect of hydrodynamic load will cause the deformation of propeller blade, and the deformation effect of propeller blade will affect the performance of propeller, but CFD numerical simulation can not fully consider its influence. Therefore, the fluid-solid coupling method, which is closer to the physical phenomenon itself, has become a problem to be considered in the design of propeller. In this paper, firstly, the propeller design is carried out by the map method, then the hydrodynamic performance of the designed propeller is analyzed by the computational fluid dynamics (CFD) method. Finally, the deformation and equivalent stress of the propeller blade are obtained by using the fluid-solid coupling method. The specific contents are as follows: 1) the propellers of a type B4-55 and B4-85 are designed by using the propeller design software, respectively, so that the core problems of the ship's propulsion system can be solved quickly and accurately. The boundary layer mesh technology is used to ensure high mesh accuracy to ensure accurate results in open water calculation. The geometric model of propeller is generated by using 3D CAD software. The flow field around the propeller is simulated numerically by using CFD method. The hydrodynamic performance of the designed propeller is obtained, and the open water characteristic curve of the propeller is plotted. The flow characteristics of the propeller flow field, such as the flow line, velocity vector and pressure distribution, are analyzed. 4) the steady state fluid-solid coupling analysis of the propeller is carried out under Workbench. The deformation and equivalent stress distribution of the design propeller blade are solved under different advancing coefficients, and the variation law of the blade deformation and equivalent stress under different materials is analyzed. The results can provide a reference for engineering application and theoretical research.
【学位授予单位】：大连海事大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U661;U664.33

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