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An Experimental Investigation on Characteristics of Flow Field of Wake Galloping

机译：尾流舞动流场特性的实验研究。

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The characteristics of the wake galloping phenomenon are evaluated for twin circular cylinders viarntwo-dimensional wind tunnel tests. The twin cylinders are deployed parallel, which simulates thernclosely spaced stay cables of a cable-stayed bridge. At first, the upstream and downstreamrndisplacements of the cylinder are observed with varying center-to-center distance between the tworncylinders. As a result, the occurrence of the wake galloping is very sensitive to the change of centerto-rncenter distance between the two cylinders. The wake galloping is observed at the downstreamrncylinder for small center distances of three to six times the diameter of the cylinder. As the spacingrnratio increases, wake galloping is weakened gradually, and disappeared for spacing ratio over sevenrntimes the diameter of the cylinder. The overall results conformed to the conventional design practicernfor the wake galloping of parallel cables. Next, flow visualization tests with a particle imagernvelocimetry equipment are conducted by varying the spacing ratio to investigate on characteristicsrnof a flow field of wake galloping. Test results show that there is a complex interaction betweenrnshear layer and the downstream cylinder when the cylinders are closely located and wind velocity isrnover the critical velocity of wake galloping. This flow-structure-interaction causes aerodynamic liftrnforce on the downstream cylinder, which is synchronized with a motion of downstream cylinder.rnWhen the spacing ratio is high enough not to induce wake galloping, however, the shear layer is notrnobserved and the overall flow seems to induce a buffeting vibration on downstream cylinder.
机译：通过二维风洞试验评估了双圆柱的尾流驰gall现象的特征。双圆柱平行布置，模拟斜拉桥紧密间隔的斜拉索。首先，观察圆柱体的上游和下游位移，并改变两个斜度轴之间的中心距。结果，尾部疾驰的发生对两个气缸之间的中心距的变化非常敏感。在下游斜纹衬套观察到尾流疾驰时，中心距是圆柱直径的三到六倍。随着间距比的增大，尾部的舞动逐渐减弱，并且随着间距的变化在圆柱体直径的七倍内消失。总体结果与传统设计的平行电缆尾波驰conform一致。接下来，通过改变间距比，用粒子图像测速仪进行流动可视化测试，以研究尾部疾驰流场的特性。试验结果表明，当汽缸紧靠位置且风速绕过尾流驰critical的临界速度时，剪切层与下游汽缸之间存在复杂的相互作用。这种流动-结构-相互作用在下游气缸上产生气动升力，该气动升力与下游气缸的运动同步。当间距比足够高而不会引起尾流疾驰时，剪力层就不能被观察到，总的流动似乎在下游气缸上产生抖振。

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