UNSTEADY RESPONSE OF A CIRCULAR CYLINDER UNDER WAKE-INDUCED EXCITATION FROM A FIXED UPSTREAM CYLINDER

被引：0
|
作者：
Assi, Gustavo R. S. [1 ]
Bearman, Peter W. [1 ]
Meneghini, Julio R. [2 ]
机构：
[1] Univ London Imperial Coll Sci Technol & Med, Dept Aeronaut, London, England
[2] Univ Sao Paulo, NDF Dept Mech Engn, Sao Paulo, Brazil
来源：
FLOW-INDUCED VIBRATION | 2008年
基金：
巴西圣保罗研究基金会;
关键词：
D O I：
暂无
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The present paper discusses the wake-induced vibrations of the downstream cylinder of a tandem pair with separation of 4 diameter from centre to centre. The upstream cylinder is fixed and the downstream one is elastically mounted in a rig with low structural mass and damping which is free to oscillate in the cross-flow direction. Oscillations are observed for reduced velocities as high as 35, reaching levels of amplitude greater than 2 diameters. We believe that wake-induced vibrations are excited by the dynamics of the wake coming from the upstream cylinder rather than the mean velocity profile approaching the downstream cylinder alone. The excitation mechanism has its origin in the lower pressure region induced by the vortices as they approach the downstream cylinder, generating an unsteady force that sustains the vibrations.
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页码：279 / +
页数：2
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