摘要
涡激振动是导致深海隔水管疲劳失效的重要因素。为有效控制隔水管涡激振动,提出了利用分离盘控制涡激振动的方法。对加装0.25～2.0倍隔水管直径的分离盘后的隔水管流动进行了二维数值模拟。研究了亚临界状态下各种模型旋涡脱落的流场结构、脱落模态、隔水管升阻力系数和旋涡泄放频率的变化特征。结果表明:分离盘加装前与经典的实验和计算结果吻合很好;不同尺寸的分离盘对隔水管涡激振动控制效果具有明显差异;当分离盘的长度为1.0至1.5倍的隔水管直径时,平均阻力系数可以减小20%,尾迹涡街的频率也有了较大的减小,达到控制涡激振动的最优效果。
Vortex-induced vibration （VIV） is an important factor causing deep-sea riser fatigue failure. In order to effectively control riser VIV, installation of a splitter plate on the riser was proposed. Tow-dimensional numerical simulation on the flow past risers with different splitter plates of the length to the diameter, L/D=0.25-2.0 was carried out. On a sub-critical state of the various models, the vortex shedding flow structure, shedding mode, drag coefficient, lift coefficient and the vortex discharge frequency characteristics were studied. It was shown that the results of the riser model without splitter plate made-good agreement with those of the classic experiment and calculations; the effect on the control of VIV of risers by attaching splitter plate of different sizes presented a significant difference. When the splitter plate was the length of 1.0 to 1.5 times the riser diameter, the drag and lift coefficient can be reduced by 20 and 8 percent, respectively, and the frequency of vortex shedding decrease by some degree to achieve the optimal effect of VIV control.
出处
《水动力学研究与进展（A辑）》
CSCD
北大核心
2009年第1期43-48,共6页
Chinese Journal of Hydrodynamics
基金
国家高技术研究发展计划项目(2008AA09Z310)
关键词
隔水管
涡激振动
分离盘
旋涡脱落
数值模拟
riser
vortex-induced vibration
splitter plate
vortex shedding
numerical simulation.
