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首页> 外文期刊>Ocean Engineering >Experimental investigation on the flow-induced vibration of a free-hanging flexible riser by internal unstable hydrodynamic slug flow
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Experimental investigation on the flow-induced vibration of a free-hanging flexible riser by internal unstable hydrodynamic slug flow

机译：内部不稳定流体动力段塞流对自由悬挂式柔性立管流致振动的实验研究

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Unstable hydrodynamic slug flow is extensively encountered in marine risers, resulting in internal flow-induced vibration, which is quite different with the vortex-induced vibration caused by a cross flow. Experiments were performed in an air-water test loop to study the internal slug flow-induced vibration of a free-hanging flexible riser with aspect ratio (the ratio of the length to the diameter of a riser) of 158. A non-intrusive technique of high speed imaging method was employed to record the vibration displacements of the riser model and the flow regime of two-phase mixture in the riser simultaneously. The results show that an in-plane vibration is created by the internal slug flow, and the responses along the two directions in the plane are interdependent to each other. In the considered gas-liquid ratio (the ratio of air flow rate to water flow rate), the second-order mode dominates the response. The hydrodynamic behaviors of slug flow, including the gas-liquid ratio, liquid slug length and superficial velocity, affect the local pressure fluctuation and hence influence the vibration amplitude. The fluid structure interaction is reflected from the same frequencies presenting in the vibration and pressure fluctuation.
机译：在船用立管中普遍遇到不稳定的流体动力弹片流动，导致内部流动引起的振动，这与错流引起的涡旋引起的振动有很大的不同。在空气-水测试回路中进行了实验，以研究纵横比（立管的长度与直径之比）为158的自由悬挂式柔性立管的内部弹团流动引起的振动。一种非侵入性技术用高速成像方法记录了立管模型的振动位移和立管中两相混合物的流动状态。结果表明，内部塞流产生了平面内振动，并且沿平面内两个方向的响应相互依赖。在考虑的气液比（空气流量与水流量的比）中，二阶模式主导了响应。团状流的流体力学行为，包括气液比，团状长度和表观速度，都会影响局部压力波动，从而影响振动幅度。流体结构的相互作用是由存在于振动和压力波动中的相同频率反映出来的。

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