并联布置立管涡激振动抑制装置试验研究

Experimental Study on Vortex Induced Vibration Suppression Device of Risers in Parallel Arrangement

针对分隔板、控制杆和减振器3种涡激振动抑制装置,在波流水槽中进行不同间距下并联布置立管的裸管试验以及抑振管涡激振动试验研究,对比分析3种抑制装置的抑制效果。试验结果表明:在同一流速条件下,附加抑振装置后立管的振动振幅与裸管相比明显降低,所采用的3种抑振装置在不同程度上均抑制海洋立管的涡激振动;从横向振动最优抑制效果来讲,控制杆的效果最好;从顺流向振动最优抑制效果来讲,控制杆和分隔板的效果好,减振器的效果较弱。综合比较不同工况下各个间距和振动方向的最优抑制效果发现,控制杆的最优抑制效果最好,能够对并联立管横向和顺流向的振动起到很好的抑制效果。

Under different riser spacing, using the vortex induced vibration suppression device of splitter plates, control rods and fairing, both bare risers and risers with suppression of vortex induced vibration in parallel connection is studied in a water tank, optimal suppression effect of three kinds suppression devices is analyzed. When exposed to the same current velocity, the vibration amplitude of risers equipped with suppression devices is conspicuously smaller than that of a bare riser, and VIV suppression devices suppress VIV at different level. The test results show that for the optimal suppression effect of transverse vibration, the optimal suppression effect of control rods is the best; for the optimal suppression effect of in-line vibration, the optimal suppression effect of control rods and splitter plates are the better, and optimal suppression effect of fairing is the weak. Comprehensively comparing the different spacing and vibration direction of the optimal suppression effect, the optimal suppression of control rods is the best and can be good effect for the parallel risers in the transverse and in-line vibration.