【摘要】 基于鸟类翅膀尾缘锯齿外形的仿生学研究,提出了一种带有双羽翼形飘带结构的海洋钻井隔水管涡激振动抑制装置。对裸圆柱模型和带有不同尾缘外形、不同长度双飘带结构的圆柱模型进行水流模拟实验,应用粒子图像测速技术测量模型的尾迹流场,得到相应的尾迹流线图和涡量图。通过比较分析得:双飘带结构能有效减少水流中圆柱模型后方的旋涡,且飘带尾缘外形能影响圆柱周围的流场,尾缘锯齿形飘带可使旋涡的产生滞后。飘带长度为圆柱直径四倍左右时对旋涡的抑制效果较好。因此,羽翼形涡激振动抑制装置能有效抑制水下隔水管的涡激振动。更多还原

【Abstract】 Based on the bionics study on trailing-edge serrations of some birds, a vortex-induced vibration suppression device for marine risers was put forward with double bird-wing shaped streamers. The water flow simulation experiment was performed on the model of a bare cylinder model and cylinder models with different trailing edge profiles and different lengths of streamers, and the wake flow field of the model was measured using the particle image velocimetry. By comparing the corresponding wake streamline diagrams and vorticity diagrams, the following conclusions were found. The double streamers structure can effectively reduce the vortex behind the cylindrical model in the water flow, and the trailing edge profiles of streamers can affect the flow field around the cylinder. When using trailing edge serrated streamers, the generation of vortex will lag. When the length of the streamers are about four times the diameter of the cylinder, the effect of vortex suppressing is better. Therefore, the bird-wing shaped vortex-induced vibration suppression device for risers is efficient and of good working performance.更多还原