本文關(guān)鍵詞：海洋隔水管渦激振動(dòng)響應(yīng)數(shù)值模擬研究　出處：《西南石油大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 隔水管 圓柱繞流 渦激振動(dòng) 流固耦合 振動(dòng)響應(yīng)

【摘要】：隨著陸上可采常規(guī)油氣資源的日漸匱乏,海洋油氣資源的有效開發(fā)成為當(dāng)今保證油氣資源穩(wěn)定供應(yīng)的新途徑。海洋隔水管是海洋油氣開采的重要設(shè)備之一,伴隨著海洋油氣資源開發(fā)向深水域邁進(jìn)的同時(shí),海洋隔水管的作業(yè)水深環(huán)境也隨之增加,隔水管結(jié)構(gòu)本身柔性增強(qiáng),在復(fù)雜惡劣的工況條件下,其渦激振動(dòng)響應(yīng)更加復(fù)雜劇烈,隔水管的性能和服役壽命存在嚴(yán)重的隱患。因此,本文對(duì)海洋隔水管渦激振動(dòng)的產(chǎn)生機(jī)理及其動(dòng)力學(xué)響應(yīng)展開研究,主要完成的研究?jī)?nèi)容有以下幾個(gè)方面:根據(jù)海洋隔水管的結(jié)構(gòu)參數(shù)和來流參數(shù),對(duì)固定隔水管繞流模型進(jìn)行仿真模擬,研究了不同雷諾數(shù)下隔水管繞流的尾流特性,升力系數(shù)、阻力系數(shù)、漩渦脫落頻率、斯特哈爾數(shù)(Strouhal)隨雷諾數(shù)的變化規(guī)律,揭示隔水管渦激振動(dòng)機(jī)理,驗(yàn)證本文計(jì)算方法和模型的準(zhǔn)確性,為下一步研究工作的開展奠定基礎(chǔ)�；诠潭ǜ羲芾@流模型的分析,對(duì)隔水管渦激振動(dòng)模型在單自由度和兩自由度兩種不同約束條件下的振動(dòng)響應(yīng)特性進(jìn)行研究,對(duì)比分析不同阻尼比和自由度對(duì)渦激振動(dòng)的升力系數(shù)、阻力系數(shù)、響應(yīng)振幅及漩渦脫落頻率的影響,為后續(xù)利用理論求解模型進(jìn)行渦激振動(dòng)響應(yīng)研究提供了分析基礎(chǔ)。建立并得到兩種不同形式的隔水管單自由度下渦激振動(dòng)響應(yīng)理論求解模型,利用四階Runge-Kutta法進(jìn)行數(shù)值求解,將數(shù)值求解結(jié)果與仿真結(jié)果進(jìn)行對(duì)比并改進(jìn)理論求解模型,利用改進(jìn)后的理論求解模型對(duì)周期性來流下的渦激振動(dòng)響應(yīng)進(jìn)行研究,得到周期性來流的頻率對(duì)振動(dòng)響應(yīng)的影響規(guī)律,提出實(shí)際應(yīng)用中應(yīng)該避免隔水管的固有頻率在來流頻率附近,從而保證隔水管的安全性。對(duì)張緊力作用下的隔水管渦激振動(dòng)進(jìn)行仿真模擬,研究不同張緊力加載形式對(duì)渦激振動(dòng)響應(yīng)的影響,得到了定常張緊力加載形式下和簡(jiǎn)諧張緊力加載形式下渦激振動(dòng)響應(yīng)的變化規(guī)律,為隔水管在實(shí)際應(yīng)用中避免渦激共振提供一定參考。本文主要完成了對(duì)隔水管渦激振動(dòng)機(jī)理的認(rèn)識(shí)及不同來流形式和不同張緊力加載形式下振動(dòng)響應(yīng)變化規(guī)律的研究,研究結(jié)論對(duì)海洋隔水管強(qiáng)度設(shè)計(jì)、加工及海面浮式裝置的升沉補(bǔ)償設(shè)備研究具有一定的理論價(jià)值和指導(dǎo)意義,對(duì)保證海洋油氣資源開采的安全性和經(jīng)濟(jì)性具有實(shí)際工程意義。
[Abstract]:With the increasing shortage of conventional oil and gas resources on land, the effective development of marine oil and gas resources has become a new way to ensure the stable supply of oil and gas resources. Marine riser is one of the important equipment in offshore oil and gas exploitation, along with the development of offshore oil and gas resources in deep waters to move at the same time, the environment operating depth of marine riser increases, the riser structure is flexible in harsh working conditions, the vortex induced vibration response is more complex and intense, insulation performance water and service life of the serious hidden danger. Therefore, the marine riser vortex induced vibration response of mechanism and kinetics, the main contents are as follows: according to the structure parameters of marine riser and flow parameters of fixed riser flow model to simulate and research the wake characteristics under different Reynolds number riser flow, lift coefficient, drag coefficient and vortex shedding frequency and Strouhal number (Strouhal) variation with Reynolds number, reveal the vibration mechanism of vortex induced vibration of pipe, verifying the accuracy of the calculate method and model, lay the foundation for the next step of the research work carried out. Analysis of flow around the fixed riser model based on vibration response of riser VIV model in single degree of freedom and two degrees of freedom under two different constraint conditions for research, comparative analysis and influence than the lift coefficient, the degree of freedom of the vortex induced vibration resistance coefficient, the response amplitude and frequency of vortex shedding is different damping, vortex induced vibration analysis provides the foundation for the later studies by using the theory of solving model. Set up and get two kinds of different forms of riser vortex induced vibration of a single degree of freedom theory to solve the model response is solved numerically by the four order Runge-Kutta method, the numerical results and the simulation results are compared and improved the theory model of vortex induced vibration response of periodic flow by using the theory to solve the model improvement the influence of vibration response of periodic flow frequency, put forward the practical application of the natural frequency of the riser should be avoided in the flow frequency, so as to ensure the safety of the riser. The simulation of riser vortex induced vibration of tension under the influence of different tension loading on vortex induced vibration, the change regularity of vortex induced vibration of constant tension loads and harmonic tension loads, in order to provide some reference in the riser the practical application to avoid vortex induced resonance. This paper mainly completed the understanding and the different of riser VIV mechanism to flow variation of the vibration response of the form and different tension loads, the conclusion of the study on the marine riser strength design, machining and surface floating device of heave compensation device has a certain theoretical value and guiding significance to ensure that it is of practical significance to the exploitation of offshore oil and gas safety and economy.
【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TE952;P742

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