海洋隔水管涡激振动响应数值模拟研究

发布时间：2017-12-26 21:44

本文关键词：海洋隔水管涡激振动响应数值模拟研究　出处：《西南石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着陆上可采常规油气资源的日渐匮乏,海洋油气资源的有效开发成为当今保证油气资源稳定供应的新途径。海洋隔水管是海洋油气开采的重要设备之一,伴随着海洋油气资源开发向深水域迈进的同时,海洋隔水管的作业水深环境也随之增加,隔水管结构本身柔性增强,在复杂恶劣的工况条件下,其涡激振动响应更加复杂剧烈,隔水管的性能和服役寿命存在严重的隐患。因此,本文对海洋隔水管涡激振动的产生机理及其动力学响应展开研究,主要完成的研究内容有以下几个方面:根据海洋隔水管的结构参数和来流参数,对固定隔水管绕流模型进行仿真模拟,研究了不同雷诺数下隔水管绕流的尾流特性,升力系数、阻力系数、漩涡脱落频率、斯特哈尔数(Strouhal)随雷诺数的变化规律,揭示隔水管涡激振动机理,验证本文计算方法和模型的准确性,为下一步研究工作的开展奠定基础。基于固定隔水管绕流模型的分析,对隔水管涡激振动模型在单自由度和两自由度两种不同约束条件下的振动响应特性进行研究,对比分析不同阻尼比和自由度对涡激振动的升力系数、阻力系数、响应振幅及漩涡脱落频率的影响,为后续利用理论求解模型进行涡激振动响应研究提供了分析基础。建立并得到两种不同形式的隔水管单自由度下涡激振动响应理论求解模型,利用四阶Runge-Kutta法进行数值求解,将数值求解结果与仿真结果进行对比并改进理论求解模型,利用改进后的理论求解模型对周期性来流下的涡激振动响应进行研究,得到周期性来流的频率对振动响应的影响规律,提出实际应用中应该避免隔水管的固有频率在来流频率附近,从而保证隔水管的安全性。对张紧力作用下的隔水管涡激振动进行仿真模拟,研究不同张紧力加载形式对涡激振动响应的影响,得到了定常张紧力加载形式下和简谐张紧力加载形式下涡激振动响应的变化规律,为隔水管在实际应用中避免涡激共振提供一定参考。本文主要完成了对隔水管涡激振动机理的认识及不同来流形式和不同张紧力加载形式下振动响应变化规律的研究,研究结论对海洋隔水管强度设计、加工及海面浮式装置的升沉补偿设备研究具有一定的理论价值和指导意义,对保证海洋油气资源开采的安全性和经济性具有实际工程意义。
[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.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE952;P742

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