Abstract In this study, wind tunnel experiments were used to evaluate the control effect of self-issuing jets on the aerodynamic characteristics of a streamlined single-box girder. Based on the deck thickness, the Reynolds number was set to 1.17 ​× ​105 ​at a zero angle of attack. The time-averaged and fluctuation characteristics of wake velocities, aerodynamic forces, and surface pressures were investigated along the streamwise and spanwise directions. The results indicated that jet slits arranged on the lower inclined panels of a bridge deck can effectively suppress the lift and moment fluctuations, and introduce three-dimensional variations in the wake velocity. The wake velocity profiles exhibit wave-like distributions in the near-wake region along the spanwise direction, and the length of the vortex formation region is elongated by the jet. Furthermore, the frequency along the spanwise direction of the wake decreases considerably. The changes in the near wake affect the upstream flow field around the deck, which reduces and varies the surface pressure along the deck span, resulting in appreciable reductions in the aerodynamic forces.

中文翻译：

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使用自发射流对单箱梁进行被动气动控制

摘要 本研究通过风洞试验研究了自发射流对流线型单箱梁气动特性的控制效果。根据甲板厚度，在零攻角时雷诺数设置为 1.17 × 105。沿流向和展向研究了尾流速度、气动力和表面压力的时均和波动特性。结果表明，布置在桥面下斜板上的射流缝可以有效抑制升力和力矩波动，并引入尾流速度的三维变化。尾流速度剖面在近尾流区沿展向呈波浪状分布，涡旋形成区的长度被射流拉长。此外，沿尾流展向方向的频率显着降低。近尾流的变化会影响甲板周围的上游流场，从而降低和改变沿甲板跨度的表面压力，导致气动力显着降低。