To suppress the vortex-induced vibration (VIV) of long-span bridges, an active flow control method, i.e. the external suction-blowing method (ESBM), is proposed in this study based on the efficiency of the three-dimensional spanwise-varying flow control method and the suction/blowing flow control method. The method can be achieved by cyclically arranging suction and blowing on the undersurface of the bridge. The effectiveness of the method for the vertical and torsional VIV of the bridge sectional model is verified through wind tunnel tests. The test results imply that the best perturbation position of the ESBM is the leading edge of the undersurface of the bridge. For dimensionless spanwise distances of 2–4 with single-hole flow coefficients of 2.27 × 10⁻³–3.03 × 10⁻³ and 1.45 × 10⁻³–1.94 × 10⁻³ during vertical and torsional VIV, respectively, the VIV can be completely suppressed. The results of the wake analysis show that this method can effectively suppress the scale of the spanwise vortex of the bridge, causing the VIV to disappear.

为了抑制大跨度桥梁的涡激振动（VIV），本研究基于三维展向变化的效率，提出了一种主动流动控制方法，即外吸吹法（ESBM）。流量控制方法和吸入/吹气流量控制方法。该方法可以通过在桥的下表面循环设置吸、吹来实现。通过风洞试验验证了该方法对桥梁截面模型的垂直和扭转VIV的有效性。测试结果表明 ESBM 的最佳扰动位置是桥梁下表面的前缘。对于 2-4 的无量纲展向距离，单孔流动系数为 2.27 × 10 ^-3 –3.03 × 10 ^-3和 1.45 × 10^-3 –1.94 × 10 ^{-3 分别}在垂直和扭转VIV期间，VIV可以被完全抑制。尾流分析结果表明，该方法能有效抑制桥梁展向涡的尺度，使VIV消失。