基于流固耦合的多相流作用下水下管道流致振动特性研究
发布时间：2018-11-29 13:00
【摘要】：水下管道是海洋油气资源开发中重要的组成部分。根据水下管道设计的要求，管道设计时一般为静强度设计，动强度设计主要集中于管道的涡激振动分析。由于水下油气分离技术要求高且成本高，油气多相混输技术得到广泛应用。为提高生产率，内流逐渐向高流速、高压发展，，这使得水下管道更容易出现流致振动的现象。由于多相流流动的不稳定性，使得多相流管道的振动问题变得十分复杂。CFD和CSD结合的流固耦合方法充分利用CFD方法对复杂流体问题的准确仿真和CSD求解结构动态响应的优势，越来越多地应用到多相流管道振动问题的研究上来。 本文主要从三个方面对水下管道流致振动特性研究进行了说明。首先介绍了流固耦合方法的基本原理，并结合目前常用的流固耦合工具ANSYS和MpCCI对CFD和CSD相结合的流固耦合方法进行了介绍，并讨论了各自的特点。 其次，对多相流的特征参数进行了说明，同时对水平管道和垂直管道内的多相流流型进行了介绍。推导了气液两相流作用下两端简支直管的振动方程并求解得到了管道的管道固有频率计算表达式，并讨论了管道几何、材料参数和流动参数对固有频率的影响。 最后利用CFD和CSD结合的流固耦合方法分别对水下直管和倒置U型跨接管进行了仿真计算。能够得到管道内的气液两相的分布，从而进行流型的判别。同时可以得到管道的动态响应，并对管内段塞流频率和管道固有频率相近时的流固耦合问题进行了分析讨论。
[Abstract]:Underwater pipeline is an important part in the exploitation of offshore oil and gas resources. According to the requirements of underwater pipeline design, the design of pipeline is usually static strength design, and the dynamic strength design is mainly focused on the vortex vibration analysis of pipeline. Due to the high requirement and high cost of underwater oil and gas separation technology, multi-phase oil and gas transportation technology has been widely used. In order to improve the productivity, the inner flow gradually develops to high velocity and high pressure, which makes the underwater pipeline more prone to the phenomenon of fluid-induced vibration. Because of the instability of multiphase flow, the vibration problem of multiphase flow pipeline becomes very complicated. The fluid-solid coupling method combined with CFD and CSD makes full use of the advantages of CFD method to simulate the complex fluid problem and CSD to solve the structural dynamic response. More and more applications are applied to the study of the vibration of multiphase flow pipelines. In this paper, three aspects of underwater pipeline flow induced vibration characteristics are described. The basic principle of fluid-solid coupling method is introduced at first, and the fluid-solid coupling method combined with CFD and CSD is introduced in combination with ANSYS and MpCCI, which are commonly used at present, and their respective characteristics are discussed. Secondly, the characteristic parameters of multiphase flow are described, and the multiphase flow patterns in horizontal and vertical pipelines are also introduced. In this paper, the vibration equation of the straight pipe with simple support at both ends under the action of gas-liquid two-phase flow is derived, and the expression of the natural frequency of the pipeline is obtained, and the influence of the pipeline geometry, material parameters and flow parameters on the natural frequency is discussed. Finally, the fluid-solid coupling method combined with CFD and CSD is used to simulate the underwater straight pipe and inverted U-shaped cross-pipe, respectively. The gas-liquid two-phase distribution in the pipeline can be obtained and the flow pattern can be determined. At the same time, the dynamic response of pipeline can be obtained, and the fluid-solid coupling problem when the frequency of slug flow is close to the natural frequency of pipeline is analyzed and discussed.
【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】：P756.2
本文编号：2365062
[Abstract]:Underwater pipeline is an important part in the exploitation of offshore oil and gas resources. According to the requirements of underwater pipeline design, the design of pipeline is usually static strength design, and the dynamic strength design is mainly focused on the vortex vibration analysis of pipeline. Due to the high requirement and high cost of underwater oil and gas separation technology, multi-phase oil and gas transportation technology has been widely used. In order to improve the productivity, the inner flow gradually develops to high velocity and high pressure, which makes the underwater pipeline more prone to the phenomenon of fluid-induced vibration. Because of the instability of multiphase flow, the vibration problem of multiphase flow pipeline becomes very complicated. The fluid-solid coupling method combined with CFD and CSD makes full use of the advantages of CFD method to simulate the complex fluid problem and CSD to solve the structural dynamic response. More and more applications are applied to the study of the vibration of multiphase flow pipelines. In this paper, three aspects of underwater pipeline flow induced vibration characteristics are described. The basic principle of fluid-solid coupling method is introduced at first, and the fluid-solid coupling method combined with CFD and CSD is introduced in combination with ANSYS and MpCCI, which are commonly used at present, and their respective characteristics are discussed. Secondly, the characteristic parameters of multiphase flow are described, and the multiphase flow patterns in horizontal and vertical pipelines are also introduced. In this paper, the vibration equation of the straight pipe with simple support at both ends under the action of gas-liquid two-phase flow is derived, and the expression of the natural frequency of the pipeline is obtained, and the influence of the pipeline geometry, material parameters and flow parameters on the natural frequency is discussed. Finally, the fluid-solid coupling method combined with CFD and CSD is used to simulate the underwater straight pipe and inverted U-shaped cross-pipe, respectively. The gas-liquid two-phase distribution in the pipeline can be obtained and the flow pattern can be determined. At the same time, the dynamic response of pipeline can be obtained, and the fluid-solid coupling problem when the frequency of slug flow is close to the natural frequency of pipeline is analyzed and discussed.
【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】：P756.2
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