In order to better understand the vortex-induced vibration mechanism of multiple cylinders, this article takes a relatively simple case of two staggered circular cylinders as the embarkation point and investigates their vortex-induced vibration characteristics by model test. The experimental Reynolds number ranges from 22,000 to 88,000. The in-line gap L is set as 3.0D, 3.6D, 4.2D and 5.5D in turn, and the cross-flow gap T is set as 0.7D, 1.1D, 1.5D, 1.9D, 2.3D and 2.7D, respectively. By measuring the vibrating response in model test, the response differences between the two staggered cylinders and the isolated cylinder and the effects of the gaps are discussed. The results indicate that the variation trend of response of the upstream cylinder with reduced velocity is basically similar to that of the isolated cylinder. However, the downstream cylinder shows some great differences. When the in-line gap ratio L/D is 3.6, the cross-flow amplitude curve of downstream cylinder changes from “single peak” to “double peaks” with the increase in cross-flow gap ratio T/D, and in-line amplitude curve even shows four different kinds of forms. When L/D is increasing, maximum amplitudes of the downstream cylinder in two directions also show an increasing trend, and the wake galloping phenomenon even appears in some conditions. Generally, the case of staggered cylinders is a generalized combination of two circular cylinders in tandem and side-by-side arrangements, and this article has extended the research scope of the double-cylinder vortex-induced vibration to arbitrary flow direction.

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两个交错圆柱体的耦合横流和同轴涡激振动响应的实验研究

为了更好地理解多圆柱体的涡激振动机理，本文以一个相对简单的两个圆柱体交错的案例为起点，通过模型试验研究了它们的涡激振动特性。实验雷诺数的范围从 22,000 到 88,000。排列间隙L依次设置为3.0D、3.6D、4.2D和5.5D，横流间隙T设置为0.7D、1.1D、1.5D、1.9D、2.3D和2.7D ， 分别。通过测量模型试验中的振动响应，讨论了两个交错圆柱体和孤立圆柱体的响应差异以及间隙的影响。结果表明，上游圆柱体的响应随速度降低的变化趋势与孤立圆柱体的响应变化趋势基本相似。然而，下游气缸表现出一些很大的差异。当管内间隙比 L/D 为 3.6 时，下游筒体横流幅值曲线随横流间隙比 T/D 的增加由“单峰”变为“双峰”。幅度曲线甚至呈现出四种不同的形式。当L/D增大时，下游圆柱体在两个方向上的最大振幅也呈现增大趋势，在某些情况下甚至出现尾流奔腾现象。一般情况下，交错圆柱体的情况是两个圆柱体串联和并列排列的广义组合，本文将双圆柱体涡激振动的研究范围扩展到任意流动方向。随着横流间隙比T/D的增加，下游筒体横流幅度曲线由“单峰”变为“双峰”，直列式幅度曲线甚至呈现出四种不同的形式。当L/D增大时，下游圆柱体在两个方向上的最大振幅也呈现增大趋势，在某些情况下甚至出现尾流奔腾现象。一般情况下，交错圆柱体的情况是两个圆柱体串联和并列排列的广义组合，本文将双圆柱体涡激振动的研究范围扩展到任意流动方向。随着横流间隙比T/D的增加，下游筒体横流幅度曲线由“单峰”变为“双峰”，直列式幅度曲线甚至呈现出四种不同的形式。当L/D增大时，下游圆柱体在两个方向上的最大振幅也呈现增大趋势，在某些情况下甚至出现尾流奔腾现象。一般情况下，交错圆柱体的情况是两个圆柱体串联和并列排列的广义组合，本文将双圆柱体涡激振动的研究范围扩展到任意流动方向。当L/D增大时，下游圆柱体在两个方向上的最大振幅也呈现增大趋势，在某些情况下甚至出现尾流奔腾现象。一般情况下，交错圆柱体的情况是两个圆柱体串联和并列排列的广义组合，本文将双圆柱体涡激振动的研究范围扩展到任意流动方向。当L/D增大时，下游圆柱体在两个方向上的最大振幅也呈现增大趋势，在某些情况下甚至出现尾流奔腾现象。一般情况下，交错圆柱体的情况是两个圆柱体串联和并列排列的广义组合，本文将双圆柱体涡激振动的研究范围扩展到任意流动方向。