Flow-induced vibration of one-fixed-one-free tandem arrangement cylinders with different mass-damping ratios using wind tunnel experiment
Flow-induced vibration of one-fixed-one-free tandem arrangement cylinders with different mass-damping ratios using wind tunnel experiment
复制标题
不同质量阻尼比一固定一自由串联排列气缸的流激振动风洞实验
DOI：
10.1016/j.jfluidstructs.2020.103019
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发表时间：
2020-07-01
影响因子：
3.6
通讯作者：
Sun, Yuankun
中科院分区：
文献类型：
--
作者：
Hu, Zhongming;Wang, Jiasong;Sun, Yuankun
在雷诺数Re = 4000-48000的风洞中，研究了四种不同质量阻尼参数m*zeta（= 0.184，0.288，0.407，0.719）的弹性安装圆柱在固定圆柱尾流中的流致振动。间距比S/D为1.1至8.0（其中S为中心到中心间距，D为圆柱体直径）。试验中采用了两种初始条件，即静止和加速。分析和讨论了振动幅值响应、振荡频率和涡脱落频率。基于m*zeta S/D和初始条件，计算结果表明，在静止和加速两种情况下，下游圆柱体的振动响应呈现三种状态：纯涡共振（VR）、VR和尾流诱发驰振（WIG）分离以及VR和WIG组合。然而，每个状态发生的S/D将根据m*zeta和初始条件而改变。涡共振、间隙流和非定常涡-结构相互作用都是引起结构振动的主要原因。当间距较小时，从静止到增速都有明显的滞后现象。随着S/D的增加，滞后可以忽略不计，并且对于各种初始条件，振动特性几乎相同。将目前在风洞中进行的高m*zeta与在水洞中进行的低m*zeta的结果进行比较，发现随着m*zeta的增大，振动的幅值和范围逐渐减小。不同的振动方式、振动频率和旋涡脱落频率存在显著差异。(C)2020爱思唯尔有限公司版权所有。
Flow-induced vibration (FIV) of an elastically mounted circular cylinder with four different mass-damping parameters m*zeta (= 0.184, 0.288, 0.407, 0.719) placed in the wake of a fixed one has been studied in a wind channel at Reynolds number Re = 4000-48000. The spacing ratios S/D are from 1.1 to 8.0 (where S is the center-to-center spacing and D is the cylinder diameter). Two initial conditions, from rest' and 'increasing velocity', are used in the test. The vibration amplitude responses, oscillation frequency and vortex shedding frequency are analyzed and discussed. Based on the m*zeta S/D and initial conditions, results indicate that, for both from rest' and Increasing velocity' cases, the downstream cylinder exhibits three regimes of vibration responses: pure VR (vortex resonance), separated VR and wake-induced galloping (WIG), and combined VR and WIG. However, the S/D for the occurrence of each regime will be changed depending on m*zeta and initial conditions. Vortex resonance, gap flow and the unsteady vortex-structure interactions can contribute to the vibrations. When the spacing is small, an obvious hysteresis phenomenon can be observed for from rest' and Increasing velocity'. As S/D increases, the hysteresis can be negligible and the vibration characteristics are nearly the same for various initial conditions. By comparing with the results between high m*zeta performed in wind tunnel at present and low m*zeta in water tunnel, it can be found that, with the increasing of m*zeta , the vibration amplitude and region are gradually decreasing. And the vibration regime, oscillation frequency and vortex shedding frequency are significantly different. (C) 2020 Elsevier Ltd. All rights reserved.