悬臂杆轴向流动诱导振动的杆尖形状效应

IF 3.4 2区 工程技术 Q1 ENGINEERING, MECHANICAL
Hao Li , Andrea Cioncolini , Shanying Zhang , Hector Iacovides , Mostafa R.A. Nabawy
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引用次数: 0

摘要

通过光学跟踪杆的运动和绘制杆尖周围的瞬时流场图,实验研究了杆尖形状对轴向水流作用下悬臂杆的流动诱导振动的影响。实验装置包括一根安装在管内的垂直悬臂杆。本研究中考虑的杆尖形状包括钝尖和高径比为 0.5、1 和 2 的锥形。实验在 20k 到 100k 的雷诺数范围内进行,采用无夹持和自由夹持两种配置,代表相反的流动方向。使用快速视频图像跟踪捕捉杆尖运动,而杆尖附近的流场则使用粒子图像测速仪(PIV)获得。杆振动动力学主要表现为模糊周期-1 行为,其特点是周期性运动带有混沌成分。在雷诺数较高的情况下,还观察到类似扑腾的振荡和屈曲,这取决于流动方向。流体与结构相互作用的机制包括湍流缓冲和运动诱发的激振。杆尖周围的非稳态流动分离被认为是流动激振的另一个促成机制。在无夹紧配置中,由于尾流区的杆表面积增大,锥尖的非稳流分离更为明显,从而导致更大的振动幅度。在自由夹紧配置中,钝尖的流动分离效应更为突出,因为流线型锥体形状不易产生流动分离。总体而言,在无夹紧配置中,钝尖杆产生的位移较小,而在自由夹紧配置中,锥尖杆产生的位移较小。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Tip shape effects on the axial-flow-induced vibration of a cantilever rod

The influence of tip shape on flow-induced vibration of a cantilever rod subjected to axial water flow is experimentally investigated, through optical tracking of the rod movement and mapping of the instantaneous flow field around the rod tip. The experimental setup consists of a vertical cantilever rod housed within a tube. The rod tip shapes considered in this study include a blunt tip and cones with height-to-diameter ratios of 0.5, 1, and 2. The experiments were conducted across a Reynolds number range between 20k to 100k in both clamped-free and free-clamped configurations, representing opposite flow directions. The rod tip motion was captured using fast video image tracking, whereas the flow field near the rod tip was obtained using particle image velocimetry (PIV). The rod vibration dynamics exhibited a primarily fuzzy period-1 behavior, characterized by a periodic motion with a chaotic component. Flutter-like oscillation and buckling were also observed at higher Reynolds numbers, depending on the flow direction. The mechanisms of fluid-structure interaction involved turbulent buffeting and movement-induced excitations. Unsteady flow separation around the rod tip was identified as a further contributing mechanism to flow excitation. In the clamped-free configuration, unsteady flow separation was more pronounced for the cone tips due to the increased rod surface area in the wake region, leading to larger vibration amplitude. In the free-clamped configuration, flow separation effects were more prominent for the blunt tip, as the streamlined cone shapes were less prone to flow separations. Overall, the rod with a blunt tip resulted in smaller displacement in the clamped-free configuration, while the rods with cone tips led to smaller displacement in the free-clamped configuration.

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来源期刊
Journal of Fluids and Structures
Journal of Fluids and Structures 工程技术-工程:机械
CiteScore
6.90
自引率
8.30%
发文量
173
审稿时长
65 days
期刊介绍: The Journal of Fluids and Structures serves as a focal point and a forum for the exchange of ideas, for the many kinds of specialists and practitioners concerned with fluid–structure interactions and the dynamics of systems related thereto, in any field. One of its aims is to foster the cross–fertilization of ideas, methods and techniques in the various disciplines involved. The journal publishes papers that present original and significant contributions on all aspects of the mechanical interactions between fluids and solids, regardless of scale.
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