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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >An experimental study on axial-flow-induced vibration of confined flexible rods with sequenced transverse rib roughness
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An experimental study on axial-flow-induced vibration of confined flexible rods with sequenced transverse rib roughness

机译：具有测序横向肋粗糙度轴向流量诱导的轴向流动诱导振动的实验研究

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摘要

Experiments were conducted with the aim of studying the dynamic behavior of vertical flexible silicon rods with clamped ends and different sequenced transverse rib roughness along their length. The rods were subjected to confined axial flow. In general, the rods have similar characteristics regarding their spatial oscillation with varying dimensionless flow velocities. Dynamic instability via high-mode flutter developed at a high flow velocity, which is characterized as a clockwise whirling motion of the first to the fourth modes. The transition from lower flutter mode to higher flutter mode was accompanied by a wave that traveled along the rods. Finally, high flow velocities led to a chaotic motion in all the rods. In this article, the onset of rod instability for the rib roughness rods is considered the beginning of the first-mode clockwise whirling motion, unlike the onset divergence that appears on a smooth-surfaced rod with no ribs. The experimental results revealed that there is a non-negligible dependence between the ribs' pitch ratio and the critical flow velocity value at the onset of rod instability, which the rod destabilizes by increasing the friction factor according to the rib optimum pitch geometric at p/e congruent to 8.
机译：通过研究垂直柔性硅棒与夹紧端的动态行为的目的进行实验，以及沿其长度的不同测序的横向肋粗糙度。杆受到限制的轴流。通常，杆具有关于它们具有不同无量纲流速的空间振荡的类似特性。通过高流速开发的高模式颤动的动态不稳定性，其特征在于第一至第四模式的顺时针旋转运​​动。从较低颤动模式到更高的颤动模式的过渡伴随着沿杆行进的波。最后，高流速导致所有杆中的混沌运动。在本文中，肋粗糙度杆的杆不稳定性的发作被认为是第一模式顺时针旋转运​​动的开始，与出现在没有肋骨的光滑表面杆上的起始发散情况不同。实验结果表明，在杆不稳定性的发作时，肋条的俯仰比和临界流速值之间存在不可忽略的依赖性，通过根据P / e一致到8。

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