海上油气输送变径管流致振动特性数值模拟研究

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中图分类号：TE952 文章标识码：A doi：10.3969/j.issn.1001-3482.2025.06.009

Abstract：The excitation of multiphase flow inside ofshore oil and gas production pipelines leads to severe flow-induced vibrations in the pipelines，especially in those with variable diameters.To address thisissue，therisk of fatigue failureand potential serioussafetyaccidents invariable-diameter pipelines caused by vibration were analyzed.A numerical simulation study was conducted on the vibration characteristics of variable - diameter pipelines under gas-liquid two-phase flow using the fluid solid coupling analysis method.Research has found that the vibration of variable -diameter pipelines is primarily caused by two factors： the excitation force from two-phase flow and the resonance resulting from excitation of the pipeline's natural frequencies.Excitation force is caused by the complex motion and interaction of fluid inside the pipeline，while resonance is the phenomenon where the vibration amplitude of the variable-diameter pipeline significantly increases when the frequency of the excitation force approaches or equals the natural frequency of the pipeline.Through in-depth analysis of the vibrationcharacteristics ofvariable-diameter pipelines，thepotential threatof multiphase flow to the structural safety of variable-diameter pipelines has been revealed，and measures to enhance the structural safety and reliability of variable-diameter pipelines have been proposed.The research resultsare of great significance for improving the safety and reliability of offshore oil and gas production systems. In addition， they can provide reference for optimizing pipeline design and reducing the impact of flow-induced vibration.

Key words：variable-diameter pipeline; gas-liquid two-phase flow; fluid-solid coupling; flow-induced vibration; natural frequency

油气输送管道是海洋油气资源开发、生产过程中进行油气输送的重要部件，对海洋油气资源的安全与稳定开发起着决定性的作用。（剩余7790字）