Abstract Wind tunnel tests were conducted to investigate the effect of the self-issuing jet flow control on the vortex-induced vibrations (VIVs) of a streamline single-box girder at various angles of attack (AOAs). Spanwise periodic passive slits were symmetrically arranged on the windward and leeward lower inclined panels of the girder. The Reynolds number varied from 4.19 × 104 to 1.14 × 105, and the AOA varied from −5.0°to 5.0°with increments of 2.5°. The vibration response characteristics of the girder with different slit arrangements were discussed, and the interactions between the shedding Karman vortices (KVs) and passive jets were investigated. The results show that the self-issuing jet control method could effectively suppress the VIV; the slits on the upper part of the lower inclined panel showed the best effect (Case I) at various AOAs. In addition, the large shedding KV were modified into two kinds of vortices: a reduced shedding KV and standing vortex at the trailing bottom corner of the girder. When the shedding vortex generation was displaced downstream, a second instability occurred in the near-wake. The self-issuing jets worked better at positive AOAs because more than one slit rows controlled the shedding vortices. Finally, the flutter performance of the single-box girder with self-issuing jets was investigated; Case I had a positive effect on the flutter behaviour at AOAs of −2.5°to 5°; the same flutter performance was observed at −5°.

中文翻译：

---

自发射流法抑制不同攻角单箱梁涡激振动

摘要 进行风洞试验以研究自发射流控制对流线型单箱梁在不同攻角 (AOA) 涡激振动 (VIV) 的影响。梁的迎风和背风下斜板上对称布置展向周期性被动缝。雷诺数从 4.19 × 104 变化到 1.14 × 105，AOA 从-5.0°到 5.0°变化，增量为 2.5°。讨论了具有不同狭缝布置的梁的振动响应特性，并研究了脱落卡门涡（KV）与被动射流之间的相互作用。结果表明，自发射流控制方法能有效抑制VIV；下倾斜面板上部的狭缝在各种迎角下显示出最佳效果（案例 I）。此外，将大脱落KV修改为两种涡：减小脱落KV和大梁后底角处的立涡。当脱落涡流向下游移动时，近尾流发生了第二次不稳定。自发射流在正迎角时效果更好，因为不止一排狭缝控制了脱落的涡流。最后，研究了带自发射流的单箱梁的颤振性能；案例 I 对 -2.5° 至 5° 的迎角处的颤振行为产生了积极影响；在 -5° 处观察到相同的颤振性能。第二次不稳定发生在近醒时。自发射流在正迎角时效果更好，因为不止一排狭缝控制了脱落的涡流。最后，研究了带自发射流的单箱梁的颤振性能；案例 I 对 -2.5° 至 5° 的迎角处的颤振行为产生了积极影响；在 -5° 处观察到相同的颤振性能。第二次不稳定发生在近醒时。自发射流在正迎角时效果更好，因为不止一排狭缝控制了脱落的涡流。最后，研究了带自发射流的单箱梁的颤振性能；案例 I 对 -2.5° 至 5° 的迎角处的颤振行为产生了积极影响；在 -5° 处观察到相同的颤振性能。