A novel aerodynamic measure, an arch mounted leeward of a circular cylinder, is proposed to reduce drag and mitigate vortex shedding for a circular cylinder. To confirm the validity of the proposed measure, the aerodynamic forces were measured through a force meter at the end of a cylinder, the wind pressure was measured at seven cross-sections of the cylinder, and elastically mounted cylinders were also tested. The results show that the arch significantly reduces drag and fluctuating lift by mitigating the vortex shedding in the subcritical Reynolds number range when the proper central angle is selected for the arch. The arch creates a higher base pressure at the leeward side and induces a pressure exchange and spanwise axial flow. This influence is extended along the length of the cylinder by the axial flow due to the strong correlation in the wake in the subcritical regime. Therefore, the arch lowers the base pressure and disrupts the formation of vortex shedding.

提出了一种新颖的空气动力学措施，即安装在圆柱体的背风处，以减少阻力并减轻圆柱体的涡流脱落。为了确认所建议措施的有效性，通过气缸端部的测力计测量了空气动力，在气缸的七个横截面处测量了风压，并对弹性安装的气缸进行了测试。结果表明，当为拱门选择合适的中心角时，拱门通过减轻亚临界雷诺数范围内的涡旋脱落而显着降低了阻力和起伏。拱形在背风侧产生较高的基本压力，并引起压力交换和翼展方向的轴向流动。由于在亚临界状态下尾流中的强相关性，这种影响通过轴向流动沿汽缸的长度扩展。因此，拱形降低了基础压力并破坏了涡旋脱落的形成。