复合材料螺旋桨流固耦合特性研究

发布时间：2018-12-14 06:43

【摘要】：螺旋桨作为船舶的主要推进装置，与其他类型推进装置相比，其推进效率高。近年来，复合材料螺旋桨研究成为热点，，受到广泛关注。本文主要分析了均匀来流情况下，复合材料螺旋桨的水动力性能和变形、应力分布等性能，结合计算流体力学方法和有限元法，提出了一种计算复合材料螺旋桨流固耦合问题的数值方法。在回顾和总结国内外关于复合材料螺旋桨研究工作的基础上，本论文采用流固耦合数值模拟方法，研究复合材料桨的流固耦合特性。在第三章中，采用脱体涡模拟（DES）和雷诺平均方法（RANS）模拟螺旋桨水动力性能，采用不同网格密度研究了模型的网格依赖性，获得详尽水动力信息，并对两种湍流模型的计算结果进行比较。结果表明：在较低进速系数情况下，由于流动存在分离，采用DES方法能获得比RANS方法更为准确的计算结果；而在其他进速系数情况下，DES方法和RANS方法的计算精度相当，但是DES方法可以获得比RANS方法更为精细的流动信息，更能真实反应流动的复杂特征在第四章中，将计算流体力学方法和有限元方法相结合，对VP1304复合材料螺旋桨非定常流固耦合性能进行研究，设计三种不同复合材料铺层，并分析不同铺层设计对螺旋桨水动力性能、压力分布、桨叶变形和应力分布信息等的影响规律。结果表明，复合材料螺旋桨敞水性能与刚性螺旋桨基本接近，但由于复合材料密度较金属材料为小，复合材料螺旋桨减重明显。考虑到大侧斜的螺旋桨桨叶更容易产生大的变形，对螺旋桨性能影响更明显。对72度大侧斜螺旋桨DTNSRDC4383进行复合材料铺层设计，并进行流固耦合性能进行研究。考虑正交对称铺层和±45°均衡对称两种铺层方式，计算并对比分析了二者的水动力性能、尾流场特性、几何变形规律以及应力分布特征等问题。计算结果表明：复合材料螺旋桨水动力性能要优于刚性桨，两种铺层方式复合材料螺旋桨性能各有优劣。
[Abstract]:As the main propulsion device of ship, propeller is more efficient than other propulsion devices. In recent years, composite propeller research has become a hot spot and received extensive attention. In this paper, the hydrodynamic properties, deformation and stress distribution of composite propeller under uniform flow are analyzed, combined with computational fluid dynamics method and finite element method. A numerical method for calculating the fluid-solid coupling problem of composite propeller is presented. On the basis of reviewing and summarizing the research work of composite propeller at home and abroad, the fluid-solid coupling characteristic of composite propeller is studied by using fluid-solid coupling numerical simulation method in this paper. In chapter 3, the hydrodynamic performance of propeller is simulated by (DES) and (RANS). The grid dependence of the model is studied with different grid density, and the detailed hydrodynamic information is obtained. The calculated results of the two turbulence models are compared. The results show that the DES method can obtain more accurate results than the RANS method because of the separation of the flow under the condition of low precession coefficient. In other cases, the accuracy of DES method and RANS method is the same, but the DES method can obtain more precise flow information than RANS method, and can reflect the complex characteristics of flow more truly in Chapter 4. The unsteady fluid-solid coupling performance of VP1304 composite propeller was studied by combining computational fluid dynamics method with finite element method. Three kinds of composite laminates were designed, and the hydrodynamic properties of propeller with different layering designs were analyzed. The influence of pressure distribution, blade deformation and stress distribution information. The results show that the open water performance of composite propeller is close to that of rigid propeller, but because the density of composite material is smaller than that of metal material, the weight loss of composite propeller is obvious. Considering that the propeller blades with large slanting propeller are easy to produce large deformation, the effect on propeller performance is more obvious. The composite lamination design and fluid-solid coupling performance of 72 degree large side inclined propeller DTNSRDC4383 were studied. Considering the orthogonal symmetrical layering and 卤45 掳equilibrium symmetry, the hydrodynamic properties, wake field characteristics, geometric deformation and stress distribution characteristics of the two layers are calculated and compared. The results show that the hydrodynamic performance of composite propeller is better than that of rigid propeller.
【学位授予单位】：上海交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U664.33

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