Abstract Based on the bionics study of trailing-edge serrations of certain birds, a vortex-induced vibration (VIV) suppression device for marine risers was developed, with double bird-wing-shaped streamers. A water flow simulation experiment was performed on a bare cylinder model as well as cylinder models with different trailing edge profiles and varying streamer lengths, and the model wake flow field was measured using particle image velocimetry. By comparing the corresponding wake streamline diagrams and vorticity, the following points were determined. The double streamer structure can reduce the velocity of the flow field on both sides of the cylinder in the water flow, and the vortex behind the cylinder. The trailing edge profiles of the streamers can affect the VIV, when using trailing-edge serrated streamers, the effect of making the vortex generation lag is more obvious. When the streamer length is approximately four times the cylinder diameter, the vortex suppression effect is improved. Therefore, the bird-wing-shaped VIV suppression device for risers can operate effectively.

中文翻译：

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深水立管涡激振动鸟翼形抑制装置试验研究

摘要 基于对某些鸟类后缘锯齿的仿生学研究，研制了一种双鸟翼形浮标的海洋立管涡激振动（VIV）抑制装置。对裸圆柱模型以及具有不同后缘轮廓和不同拖缆长度的圆柱模型进行了水流模拟实验，并使用粒子图像测速法测量了模型尾流场。通过比较相应的尾流流线图和涡度，确定了以下几点。双流光结构可以降低水流中圆柱体两侧流场的速度，以及圆柱体后面的涡流。当使用后缘锯齿状拖缆时，拖缆的后缘轮廓会影响 VIV，使涡流产生滞后的效果更加明显。当流注长度约为圆柱直径的 4 倍时，涡流抑制效果提高。因此，该立管鸟翼形VIV抑制装置可有效运行。