Experimental Investigation of Disturbing the Flow Field on the Vortex-Induced Vibration of Deepwater Riser Fitted with Gas Jetting Active Vibration Suppression Device
Experimental Investigation of Disturbing the Flow Field on the Vortex-Induced Vibration of Deepwater Riser Fitted with Gas Jetting Active Vibration Suppression Device
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DOI：
10.1007/s13344-020-0031-7
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发表时间：
2020-06
影响因子：
1.6
通讯作者：
Pengfei Li;Zhen-xing Jiang;Yu Liu;Yu Wang;Haipeng Guo;Fei Wang;Yong-bo Zhang
中科院分区：
文献类型：
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作者：
Pengfei Li;Zhen-xing Jiang;Yu Liu;Yu Wang;Haipeng Guo;Fei Wang;Yong-bo Zhang
在波流组合水槽中开展了射流式主动减振装置对深海立管涡激振动扰动效果的实验研究。设计了将喷管水平固定在立管前端的减振装置。通过改变三种不同的激励间距和多级流出速度，研究了不同激励间距下主频率、无因次位移等动态响应参数的影响规律，探索了扰动抑制的机理和敏感特性。研究结果表明：激励间距的变化使得气幕以不同的速度和角度进入强扰动流区域，激励间距与折减速度的耦合关系是进入强扰动流区域实现最优扰动抑制的关键因素。在强扰动流区，气幕对主频的影响明显受流速影响，而振动位移在同幅值下稳定，受流速影响较弱。气幕能有效扰动涡脱落的形成，破坏立管强烈的非线性耦合振动，达到较好的抑振效果。在弱扰流区，立管尾部涡长延长，立管强非线性耦合振动逐渐恢复，装置的抑振效果逐渐减弱。
An experimental investigation on the disturbance effect of jet-type active vibration suppression device on vortex-induced vibration of deep-sea riser was carried out in the wave-flow combined flume. The vibration suppression device was designed in which the jet pipe was horizontally fixed to the front end of the riser. By varying three different excitation spacings and multi-stage outflow velocities, the influence law of the dominant frequency, dimensionless displacement and other dynamic response parameters was studied under different excitation spacings, and the mechanism and sensitive characteristics of the disturbance suppression were explored. The results indicate that the variation of excitation spacing makes gas curtain enter the strong disturbed flow region at different velocities and angles, and the coupling relationship between excitation spacing and reduced velocity is the key factor to enter the strong disturbed flow region to achieve the optimal disturbance suppression. In the strong disturbed flow region, the influence of gas curtain on the dominant frequency is obviously affected by the flow velocity, while the vibration displacement is stable at the same amplitude and is weakly affected by the flow velocity. Gas curtain can effectively disturb the formation of vortex shedding, destroy the strong nonlinear coupled vibration of the riser, and achieve better vibration suppression effect. In the weak disturbed flow region, the vortex length of the riser tail is prolonged, the strong nonlinear coupled vibration of the riser is gradually restored, and the vibration suppression effect of the device gradually decreases.