尾流干扰下桥梁斜拉索风荷载的吹气控制

Jet flow control of wind loads on stay cables under wake disturbance

为了降低并列双圆柱(桥梁斜拉索的简化模型)在风荷载作用下的剧烈响应,提出了一种能同时抑制并列双圆柱风荷载的主动流动控制方法。采用数值模拟方法研究了并列双圆柱的流动控制效果,结果表明:并列双圆柱间距比为圆柱直径的3倍时风荷载最大,在圆柱尾部施加吹气速度为来流风速的1.5倍时控制效果显著,可以有效降低风荷载并抑制双柱的漩涡脱落。控制机理在于吹气可以有效减小每个圆柱的尾流宽度,抑制两个尾流的相互作用。

This paper aims to reduce the severe response to the wind load on side-by-side double cylinders(a simplified model of bridge stay cables),and proposes an active flow control method to suppress wind loads concurrently on these cylinders.The numerical simulation method is used to explore the flow control effects on the double cylinders.The results show that the maximum wind load presents at the spacing ratio of the side-by-side two cylinders with 3 times of the cylinder diameter,and the significant control effect appears at the jet flow velocity of 1.5 times of the inflow wind velocity applied to the wake of the cylinders,which effectively reduce the wind loads and suppress the vortex shedding in the double cylinders.The control mechanism is that the jet flow can effectively reduce the wake width of each cylinder and suppress the interaction between the two wake streams.