An active suction-jet flow control method was employed to suppress vortex-induced vibrations (VIVs) of a single-box girder based on a wind tunnel test. The flow structure around a fixed model was measured by time-resolved particle image velocimetry (PIV), and the stability of the flow field was evaluated in the controlled and uncontrolled cases according to the solution of the Orr–Sommerfeld equation. The PIV results show that the maximum value and distribution region of the turbulence kinetic energy were alleviated. The linear stability analysis indicates that the unsteady flow of the controlled cases was pushed downstream. The vibration response and flow structures of vertical and torsional vortex-induced vibrations (V- and T-VIVs) were then investigated. The results show that the amplitudes of V-VIVs and T-VIVs were greatly suppressed by the active suction-jet slit, and the momentum coefficient at 0.0301 had the most-effective control. Moreover, time-resolved PIV was utilized to investigate the flow structures of the baseline and optimal control cases. The results indicate that the vortex dissipation behind the optimal control case was accelerated, and the topological structure in the wake changed. The vortex contours show that the jet flow strongly interacted with the separated layer and alleviated the interaction of shear flow from the upper and lower surfaces, thereby weakening the unsteady aerodynamic force acting on the test model and mitigating the VIVs. Furthermore, a test of the flutter performance indicated that the critical velocity of flutter in the optimal case improved slightly.

基于风洞试验，采用主动吸射流控制方法抑制单箱梁的涡激振动（VIV）。通过时间分辨粒子图像测速法（PIV）测量固定模型周围的流动结构，并根据Orr-Sommerfeld方程的解在受控和非受控情况下评估流场的稳定性。PIV结果表明湍流动能的最大值和分布区域得到缓解。线性稳定性分析表明受控工况的非定常流动被推向下游。然后研究了垂直和扭转涡激振动（V-和 T-VIV）的振动响应和流动结构。结果表明，主动吸射狭缝极大地抑制了V-VIVs和T-VIVs的振幅，其中0.0301的动量系数控制最有效。此外，时间分辨 PIV 被用来研究基线和最佳控制案例的流动结构。结果表明，最优控制工况后涡耗散加速，尾流拓扑结构发生变化。涡流等值线表明，射流与分离层强烈相互作用，减轻了上下表面剪切流的相互作用，从而减弱了作用在试验模型上的非定常气动力，减轻了VIV。此外，对颤振性能的测试表明，在最佳情况下颤振的临界速度略有提高。