An experiment is conducted in a small-scale air–water test loop to investigate the severe slug flow-induced vibration of a flexible catenary riser of aspect ratio (the riser length over its internal diameter) 200. The vibration displacement of the catenary riser as well as the internal flow features is simultaneously captured by high-speed cameras. Three stages are observed during a cycle of severe slugging in the riser, including the slug formation, gas blowout, and transition stages. The spatial-temporal dynamic behavior of the flexible catenary riser is closely related to the stage of severe slug flow, liquid slug length, and liquid inventory along the riser, presenting a resonance between the oscillation and the fluid pressure fluctuation.

中文翻译：

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柔性悬链线立管严重段塞流引起的非线性动力学行为

在一个小规模的空气-水测试回路中进行了一项实验，以研究纵横比（立管长度与其内径）为 200 的柔性悬链管隔水管的剧烈段塞流引起的振动。悬链管隔水管的振动位移为以及内部流动特征由高速相机同时捕获。在立管严重段塞循环过程中观察到三个阶段，包括段塞形成、气体井喷和过渡阶段。柔性悬链线立管的时空动力学行为与严重段塞流阶段、液塞长度和沿立管的液体存量密切相关，呈现振荡与流体压力波动之间的共振。