A novel bluff-body control concept by using combined windward-and-leeward jets was introduced to modify the wake-vortex patterns and suppress the aerodynamic forces acting on a circular cylinder. Wind tunnel investigations are performed at a subcritical Reynolds number of Re = 3.33 × 10⁴, which is a typical Re level that the wind-induced cable vibrations usually occur. The strength and effectiveness of active control in the present study are characterized with a dimensionless equivalent jet momentum coefficient C_µ. The particle image velocimetry (PIV) technique is employed to measure the wake flow patterns of the baseline and controlled cylinders to reveal the great modifications of active control to the cylinder wake. Except for PIV tests, surface pressure measurements are also conducted to obtain the pressure distribution around the cylinder surface so as to estimate the aerodynamic forces, i.e., drag and lift forces acting on the baseline and controlled cylinders. Pressure measurement results demonstrate clearly the control effectiveness and the wake flow topologies obtained by PIV system help to uncover the mechanism of windward-and-leeward jet control.

Graphical abstract

中文翻译：

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用稳定的迎风和背风射流控制的截面电缆模型的压力分布、空气动力和尾涡演化

通过使用组合迎风和背风射流引入了一种新颖的钝体控制概念，以修改尾涡模式并抑制作用在圆柱上的空气动力。风洞研究在 Re = 3.33 × 10 ⁴的亚临界雷诺数下进行，这是风致电缆振动通常发生的典型 Re 水平。本研究中主动控制的强度和有效性以无量纲等效射流动量系数C _{µ 为特征}. 采用粒子图像测速 (PIV) 技术测量基线和受控气缸的尾流模式，以揭示主动控制对气缸尾流的重大修改。除了 PIV 测试外，还进行表面压力测量以获得圆柱表面周围的压力分布，以估计空气动力，即作用在基线和受控圆柱上的阻力和升力。压力测量结果清楚地证明了控制有效性，PIV 系统获得的尾流拓扑有助于揭示迎风和背风射流控制机制。

图形概要