【摘要】：水下管道是海洋油氣資源開發(fā)中重要的組成部分。根據(jù)水下管道設(shè)計(jì)的要求，管道設(shè)計(jì)時(shí)一般為靜強(qiáng)度設(shè)計(jì)，動(dòng)強(qiáng)度設(shè)計(jì)主要集中于管道的渦激振動(dòng)分析。由于水下油氣分離技術(shù)要求高且成本高，油氣多相混輸技術(shù)得到廣泛應(yīng)用。為提高生產(chǎn)率，內(nèi)流逐漸向高流速、高壓發(fā)展，，這使得水下管道更容易出現(xiàn)流致振動(dòng)的現(xiàn)象。由于多相流流動(dòng)的不穩(wěn)定性，使得多相流管道的振動(dòng)問題變得十分復(fù)雜。CFD和CSD結(jié)合的流固耦合方法充分利用CFD方法對(duì)復(fù)雜流體問題的準(zhǔn)確仿真和CSD求解結(jié)構(gòu)動(dòng)態(tài)響應(yīng)的優(yōu)勢，越來越多地應(yīng)用到多相流管道振動(dòng)問題的研究上來。 本文主要從三個(gè)方面對(duì)水下管道流致振動(dòng)特性研究進(jìn)行了說明。首先介紹了流固耦合方法的基本原理，并結(jié)合目前常用的流固耦合工具ANSYS和MpCCI對(duì)CFD和CSD相結(jié)合的流固耦合方法進(jìn)行了介紹，并討論了各自的特點(diǎn)。 其次，對(duì)多相流的特征參數(shù)進(jìn)行了說明，同時(shí)對(duì)水平管道和垂直管道內(nèi)的多相流流型進(jìn)行了介紹。推導(dǎo)了氣液兩相流作用下兩端簡支直管的振動(dòng)方程并求解得到了管道的管道固有頻率計(jì)算表達(dá)式，并討論了管道幾何、材料參數(shù)和流動(dòng)參數(shù)對(duì)固有頻率的影響。 最后利用CFD和CSD結(jié)合的流固耦合方法分別對(duì)水下直管和倒置U型跨接管進(jìn)行了仿真計(jì)算。能夠得到管道內(nèi)的氣液兩相的分布，從而進(jìn)行流型的判別。同時(shí)可以得到管道的動(dòng)態(tài)響應(yīng)，并對(duì)管內(nèi)段塞流頻率和管道固有頻率相近時(shí)的流固耦合問題進(jìn)行了分析討論。
[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.
【學(xué)位授予單位】：上海交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：P756.2

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