【摘要】 针对海洋工程柱式结构在实际水流中受到涡旋和流体力作用可能导致破坏的问题，为其附加整流罩以控制尾流，设计并完成基于PIV技术的流场特性研究实验方案。探究不同流速下光滑圆柱的流场情况；保持雷诺数Re=3 900不变，改变顶角角度(60°/90°/120°)、来流攻角角度(0°/30°/45°/60°/180°)和连接方式(固定/旋转),研究整流罩的流场情况；将整流罩与光滑圆柱的升阻力测量结果及尾流场涡量图对比。实验结果表明，整流罩能够有效保护内部柱式结构，其中顶角为60°的旋转整流罩对升阻力和涡脱频率的抑制效果最明显。更多还原

【Abstract】 To address the issue of vortex and hydrodynamic forces that may cause damage to cylindrical marine structures in practical flow conditions, a fairing was attached to control the wake flow. An experimental study based on particle image velocimetry(PIV) technology was designed and conducted to investigate the flow field characteristics. The flow field around a smooth cylinder was examined under different flow velocities. While maintaining a constant Reynolds number(Re=3900), the effects of fairing geometry, including apex angle(60°/90°/120°), incoming flow attack angle(0°/30°/45°/60°/180°), and connection methods(fixed/rotating), were studied. The lift and drag measurements and the vorticity maps of the wake flow were compared between the fairing-equipped cylinder and the smooth cylinder. The experimental results demonstrated that the fairing effectively protects the internal cylindrical structure. Among the tested configurations, the rotating fairing with a 60° apex angle exhibited the most significant suppression of lift and drag forces as well as vortex shedding frequency.更多还原