热-流-固三场耦合作用下悬跨海底管道动力响应和屈曲研究

本项目围绕国家在深水油气勘探开发技术的重大战略需求，聚焦内、外流作用下高温高压海底管道的振动与动力屈曲问题。基于申请人及课题组在结构冲击动力学和流固耦合等领域的研究基础，对管道的温度场、内流和外流进行准确的数学描述，结合不同荷载、几何和材料特性条件下的结构变形和振动特性，提出热-流-固三场耦合作用下海底管道悬跨段的一维/三维—线性/非线性动力响应和动力屈曲计算方法，形成一套解析求解体系，并与数值模拟结果相互验证。基于流体和结构相似准则，建立一套考虑温度荷载和内、外流的海底管道悬跨段动力响应试验方案，验证解析计算体系。综合利用解析、数值和试验等多种手段，深入分析各方面因素对于悬跨段线性和非线性自振特性、激振特性和动力屈曲的影响，揭示热-流-固多物理场相互作用机理，探明热-流-固三场对于管道动力响应和动力屈曲的共同作用机制，为高温高压海底管道的振动和动力稳定性安全评估提供理论基础和科学依据。

According to the major strategy on the technique of Oil &Gas exploration and development in deep water, this project focuses on the vibration and dynamic buckling of free spanning submarine pipeline with high temperature, high pressure, conveying fluid and fluid outside. Based on the research experience on impact dynamics and Fluid Structure Interaction, the dynamic response and buckling of free spanning submarine pipeline are investigated. The temperature field and the effects of conveying fluid and fluid outside are mathematically descripted precisely. Considering the deflection and vibration characteristics of pipeline varying by load, geometry and materials, 1D/3D—Linear/Nonlinear methods are developed for the dynamic response and buckling of free spanning submarine pipeline. Combining all the methods, an analytical methodology for dynamic response and buckling are proposed. Based on the fluid similarity criterion and structure similarity criterion, an experiment setup considering the conveying fluid, fluid outside and temperature loads are proposed for the dynamic response and buckling. The analytical methodology proposed is validated by comparison with experiment results. By employing analytical methods, numerical methods and experiments, the effects of various factors on the linear and nonlinear free vibration characteristics, force vibration characteristics and dynamic buckling characteristics are investigated. The interaction mechanism between thermo-hydro-mechanical field and the combined action of thermo-hydro-mechanical field on dynamic response and buckling are analyzed. The research provides a scientific basis and theory foundation for the safety assessment for vibration and dynamic stability of free spanning submarine pipeline.