采用模型试验方法,研究了雷诺数为2.5×103~2×104范围内张力腿平台的涡激运动问题。试验中设计了一套考虑水平和垂向系泊刚度的锚泊方案,捕捉到涡激运动中的“锁定”和“两支”等现象。试验结果表明:横流向和顺流向均发生了频率锁定现象,横向达到锁定范围的折合速度为Ur = 4.0~7.0,顺流向为Ur = 6.0~7.0,且横向运动居主导地位。在Ur≤4.0的非锁定区,涡激升力模型满足斯特哈尔关系;而当Ur>4.0时,该公式不再适用。试验结果也表明:流向角是影响平台运动轨迹的关键因素,当流向角为0°时,平台运动呈正“8字形”;15°时,运动轨迹为“香蕉形”;45°时,为略向左侧弯曲的扁“8字形”。
Abstract
In order to study vortex induced motions(VIM) of tension leg platform(TLP), the model test was carried out in the range of Reynolds number 2.5×103~2×104. The lock-in and two phase phenomena were caught by considering horizontal and vertical stiffness in the designed mooring program. The results show that both the transverse and in-line directions occured frequency-locking, and the transverse motion has the predominate position. In this Reynolds number range, the corresponding lock-in region in transverse direction is for Ur=4.0~7.0 and in-line direction is for Ur=6.0~7.0. The left force model satisfy strouhal relations under Ur≤4.0. While it is no longer suitable under Ur>4.0. It is also revealed that the current incidences is the key factors influencing the motion trace. It has the ‘8-shaped’ track under 0°incidences, while in 15°incidences it has the ‘banana-shaped’, and the flat ‘8-shaped’ bending to the left in 45°incidences.
关键词
涡激运动 /
张力腿平台 /
模型试验 /
锁定区 /
折合速度
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Key words
VIM /
TLP platform /
model test /
lock-in region /
reduced velocity
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