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管道內氣液兩相流流激力研究進展

Research progress of fluctuating force caused by internal gas-liquid flow

  • 摘要: 管道內氣液兩相流廣泛存在于核工業、化工業以及石油運輸等多個領域中,其誘發的流激力會引起管道振動,導致管系的疲勞破壞。本文分別從流激力發生機理、影響因素及計算模型出發,對流激力研究進展進行綜述。研究表明:動量通量的改變被認為是引起流激力的最主要原因,管道內壓力波動、液塞的脈動沖擊、起伏不定的液波等因素同樣會對流激力的產生做出貢獻,針對不同流型建立完整的流激力發生機理的理論體系,是流激力機理研究方面的重點發展方向。在不同流型下,流激力展現出不同的波動特征,目前研究所針對的管道大多是單獨的水平管或立管管道,開展多種集輸–立管管道系統中流激力的研究將具有重要的工程意義。關于流激力經驗模型和理論模型的建立逐漸完善,計算流體力學(Computational fluid dynamics,簡稱CFD)軟件能夠同時對流場和流激力大小進行模擬計算,優勢明顯,是一種重要的計算手段,對CFD軟件計算結果的準確性進行研究,對比優選有效的CFD計算模擬方法,將具有重要科研價值。

     

    Abstract: Two-phase flow (Gas-liquid) in pipelines is widely present in many fields, such as nuclear industry, chemical industry, and petroleum transportation. Compared with single-phase flow, the density, pressure, and momentum flux in two-phase flow change greatly in the flow. When flowing through a valve, elbows, tees, and other components, a pulsating force is induced, which is termed as the “flow-induced force.” Flow-induced force causes pipeline vibration. If the vibration frequency is close to the natural frequency of the pipeline, a resonance phenomenon occurs that can further increase the vibration amplitude of the pipeline and consequently cause fatigue damage to the pipeline system. Therefore, research on flow-induced force is of great significance for the safe design and operation of pipelines. In this paper, the research progress on the mechanism, influencing factors, and calculation models of flow-induced force was reviewed. The results show that the change of momentum flux is the dominant factor in causing flow-induced force. The pressure fluctuations, pulsation of the liquid slug, and the volatile liquid wave also contribute to force fluctuation. This study aims to establish a complete theoretical system of flow-induced force mechanism that shows varying wave characteristics with different flow patterns. Most of the current studies focus on single horizontal pipe or riser pipe. With the development of deep-sea oil and gas, demand on gathering and transportation-riser pipeline systems is increased, making it a great engineering significance to study the flow-induced force in a variety of pipeline-riser systems. The empirical and theoretical models are gradually established. The ability of CFD software to simulate flow field and excitation force offers numerous advantages. Therefore, research on the accuracy of CFD software calculation results and the comparison and optimization of effective CFD calculation simulation methods will have important scientific research value for development in the future. This article comprehensively summarized the current research status of gas-liquid two-phase internal flow excitation, which can provide guidance for further related research.

     

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