The flow-induced motion (FIM) of an elastically mounted square-section cylinder is experimentally investigated over a wide range of Reynolds numbers (1.5 × 10⁴ < Re < 7.0 × 10⁴). A 14 m long towing tank water channel and a carrier are designed to facilitate the investigation of FIM at high velocities. The cylinder is limited to a transverse oscillation and is carried inside the water channel. The effect of cylinder orientation on FIM is studied by performing experiments for two angles of attack (45° and 0°). The experiments are performed for two different spring stiffness to consider the influence of the natural frequency on the response of the system. Since the water has been allowed to stay calm between the tests, experiments are conducted with zero disturbance of the fluid flow around the cylinder. The experimental setup has shown promising results for a circular cylinder in our previous studies. The results for the diamond cylinder (square-section cylinder with a 45° angle of attack) indicate that FIM only consists of vortex-induced vibration (VIV) and the oscillation in the upper branch occurs in a wider range of reduced velocities compared with the circular cylinder. It can be concluded that a diamond cylinder is a better option for having synchronization in a wider range of water velocities for the purpose of energy extraction in VIV-based ocean energy conversion devices.

在宽范围的雷诺数（1.5×10 ⁴ < Re <7.0×10 ⁴）。设计了一条14 m长的拖船水道和一个运载工具，以方便在高速下对FIM进行研究。圆柱体受到横向振动的限制，并被承载在水通道内。通过对两个迎角（45°和0°）进行实验，研究了圆柱方向对FIM的影响。针对两种不同的弹簧刚度进行了实验，以考虑固有频率对系统响应的影响。由于在两次测试之间已经允许水保持平静，因此在气缸周围的流体流动受到零干扰的情况下进行了实验。在我们以前的研究中，实验装置已显示出令人鼓舞的结果。菱形圆柱体（具有45°迎角的方形圆柱体）的结果表明，FIM仅由涡流诱发的振动（VIV）组成，并且与之相比，上部分支中的振荡发生在更宽的降低速度范围内圆柱体。可以得出结论，为了在基于VIV的海洋能转换设备中提取能量，金刚石圆柱体是在更广泛的水速范围内进行同步的更好选择。