Spoiler plate effects on the suppression of vortex-induced motions of a single circular cylinder
Spoiler plate effects on the suppression of vortex-induced motions of a single circular cylinder
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DOI：
10.1016/j.oceaneng.2020.107569
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发表时间：
2020-08
影响因子：
5
通讯作者：
V. Bianchi;L. S. Silva;F. Cenci;S. Hirabayashi;Hideyuki Suzuki;Rodolfo T. Gonçalves
中科院分区：
文献类型：
--
作者：
V. Bianchi;L. S. Silva;F. Cenci;S. Hirabayashi;Hideyuki Suzuki;Rodolfo T. Gonçalves
已经提出了几种方法来减轻海上结构物上的涡激运动（Vim），例如使用边条、分流板和扰流板。在减缓装置中，扰流板仍然没有得到充分的探讨。针对这种情况，进行了扰流板抑制低展弦比圆柱涡激运动的参数化实验研究。实验是在拖曳水池中进行的。所测试的圆柱体具有1.5的纵横比（L/D），其通常用于半潜式（SS）平台的单柱和柱。通过改变扰流板展弦比（A R，S）、沿圆柱垂直轴沿着有扰流板的环数（n L）和每个环的扰流板数（n D），对几种构型进行了研究。研究的折合速度从1到12不等，雷诺数从12，500到95，000不等。结果表明，发生了一个designation的旋涡脱落，这导致了显着减少的线和横向振幅。此外，与裸圆柱体相比，最大改进情况下的阻力降低约50%，证明了这种缓解装置的潜在解决方案。
Several methodologies have been proposed to mitigate vortex-induced motions (VIM) on offshore structures, such as the use of strakes, splitter plates, and spoiler plates. Among the mitigation devices, spoiler plates remain insufficiently explored. Given the situation, a parametric experimental investigation was undertaken to investigate the suppression of vortex-induced motions of a circular cylinder with a low aspect ratio using spoiler plates. The experiments were carried out in a towing tank. The circular cylinder tested had an aspect ratio (L/D) of 1.5, which is typically employed in monocolumns and columns of semi-submersible (SS) platforms. Several configurations were investigated by changing the spoiler plate aspect ratio (A R, S), the number of rings with spoiler plates along the vertical axis of the cylinder (n L), and the number of spoiler plates per ring (n D). The reduced velocities investigated varied from 1 to 12, and the Reynolds number from 12,500 to 95,000. The results demonstrated the occurrence of a desynchronization of the vortex shedding, which led to a significant reduction of the in-line and transverse amplitudes. Moreover, a decrease in drag forces of approximately 50% occurred for the most improved case, compared with a bare cylinder, demonstrating a potential solution for this mitigation device.