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大型水轮机振动分析及粘性流体与弹性结构耦合的有限元格式【作者】王辉 【导师】杜…

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1awr)b9[}HsO0大型水轮机振动分析及粘性流体与弹性结构耦合的有限元格式水利论文$KU|#W2K H

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【作者】王辉导师】杜庆华; 岑章志水利论文 \$k8Ge1xt{v
【作者基本信息】清华大学,固体力学,1997年,博士水利论文%s3p eI}$`

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【中文摘要】 三峡工程是世界上最伟大的工程之一,具有重大的社会、经济意义。她的建设,不仅会促进我国经济、工业发展,同时对基础科学技术的发展提供了难得的机遇。三峡水轮机是世界规模最大的水轮机组之一,随着机组规模的增大,稳定性问题成为水轮机设计考虑的重要因素。大型水轮机稳定性主要涉及两个方面:一.涡带的影响;二.叶片与水流的耦合振动。第二个方面是一个典型的流固耦合问题,工程中属于此类的问题还有许多,它们构成了本文研究主要背景。 涡带对水轮机轴系产生一种横向力的扰动,因为水轮机内流动的复杂性,此方面的研究还比较少。对于叶片与水流的耦合振动以及工程中大量的流固耦合问题,传统的做法是将流体作很多简化,如假设流体为无粘、无旋、小扰动的介质。而这些方法显然无法分析由于流体粘性带来的复杂流固耦合问题。 本文针对水轮机组第一种不稳定因素,建立了一种计算水轮机轴系横向力的可行性方法。在通过对尾水管内涡带对转轮影响方式的调查研究,建立涡带周期脉动的简化模型,将这种脉动作用于转轮流场计算模型上,最终计算得到了不平衡横向力,将可以作为轴系分析的已知外力,为水轮机轴系动力分析提供数据。但更准确地进行动态分析,需要考虑叶片与流体...更多之间的耦合作用。 对于水轮机及工程中大量存在的流固耦合问题,进行了更一般性的有限元方法的研究。文中建立了一种有效的分析不可压粘性流体与结构耦合作用的有限元方法。这方面的工作有:1.根据流体粘性在耦合作用中起的作用,采用粘性不可压的流体模型。选取SU/PG有限元这种广泛应用的方法,对SU/PG进行了论证,推导出一些结论;2.形成本文简化的SU/PG格式,编制了流场分析程序,实现了定常、非定常问题的计算;3.采用ALE描述,对ALE描述的本质进行了论证,对ALE描述网格修正应满足的规律进行了探讨;4.形成不可压粘性流体与结构耦合作用模型;5.形成求解流体-结构耦合非线性有限元方程的修正的Predictor-Multicorrector算法;6.编程进行了粘性流体-结构耦合分析,计算了三个算例。通过对算例的分析,得到了流体不同特性对耦合作用的影响,计算得到了涡街引起板振动的算例。 另外,作为工程实用非常必要的辅助手段,本文进行了流固耦合计算结果的可视化工作。以简单的算法实现了令人满意的压力等值线图、速度矢量图显示输出,以及动画显示耦合振动的过程。  还原水利论文 ]Gm+fb*o?{ ?

!D2E6?%z |,Zxe0【英文摘要】 Three Gorges Hydroelectric Station is one of gigantic projects in the world with enormous economical and social benefits. The hydraulic generator units will be among the largest in the world. As the size of the hydraulic generator units increases, the operation stability becomes the very important consideration in the design process. Two aspects will affect the operation stability: the draft tube surges, and the flow induced vibration of turbine blade. The later aspect is one kind of fluid-structure interaction. In engineering, there are many similar problems such as the vibration of suspend bridges in the wind. These, together with the stability consideration of hydraulic generator units, are the engineering background of this thesis.The draft tube surges influence the operation stability by exerting periodical unbalanced transverse forces on the ainner. Very few work has been carried out in this area because of the complexity of the flow inside the huge turbine. There are many method...更多s for solving fluid-structure interaction problems. Most of these methods take the fluid as non-viscid media with limited fluid displacement. As a result, these methods are lack of the ability to analyze the complex fluid-structure interaction problems, in which viscosity of fluid plays an important role.As to the flow-induced vibration of turbine blade and other fluid-structure interaction problems in engineering, a general numerical procedure is developed. The fluid is considered to be incompressible viscous media and many related complex phenomena are taken inconsideration. The detailed works in this part can be summarized as follows: 1). Based on the investigation of the engineering problems, the fluid is considered to be imcompressible viscous. SU/PG finite element is employed to analysis the fluid flow. The theory is proved here, and the upwind parameter is obtained through deduction. 2). A simplified SU/PG finite element method is employed to analyze the flow and based on this method a program is completed. Two numerical examples are given. The results of steady and unsteady problems are quite accurate. 3). Arbitrary Lagrangian-Eulerian description is used to incorporate the interface condition between the structure and the fluid. Based on the essence of ALE, some regulations of mesh regeneration are put forward. 4). The interaction modal of incompressible viscous fluid and structure is given. 5). A modified Predictor-Multicorrector solving procedure is proposed to solve the nonlinear equations of the coupled system. 6). A program is completed. Three numerical examples are computed. The influences of different parameters of fluid are analyzed. The fluid-induced vibration of a plate is obtained.As the auxiliary works, some efforts are made to visualize the computational results. The color contour of pressure, and the vector distribution of fluid can be directly perceived in graphic sense. A simple method is used to produce simple cartoons, which display the interacting process of fluid and structure in the engineering analysis.  还原水利论文D9ub w-D;J;u1y

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【中文关键词】 粘性流体; SU/PG有限元; ALE描述; 流固耦合; 涡带水利论文8_DcrbB8v
【英文关键词】 viscous fluid; streamline upwind/Petrov-Galerkin finite element method; arbitrary Lagrangian-Eulerian description; fluid-structure interaction; draft tube surges水利论文M)@hMWX-i%o6\
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TAG: 有限元 振动分析 王辉 流体 水轮机
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下一篇:流体与结构相耦合系统的有限元法研究【作者】王永辉 【导师】杜庆华; 姚振汉
上一篇:三维弹塑性分析的有限元—边界元耦合方法【作者】岑章志 【导师】杜庆华; 王勖成
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