AN EXPERIMENTAL STUDY OF FLUCTUATING LIFT ON A SQUARE-SECTION CYLINDER OSCILLATING TRANS-VERSELY IN A UNIFORM STREAM
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摘要: 本文对均匀流中静止方柱和横向强迫振动的方柱进行了实验研究。实验雷诺数范围为 3×10~3～10~4,振幅与柱截面宽度之比 A/D 达到0.7,实验折合速度范围为 4.5≤V_r≤12。文章重点研究了较高振幅振动柱的锁定现象、波动升力与柱位移之间的相位变化,讨论了方柱涡激振荡、驰振和气动稳定性问题。对流场进行的流动显示,清晰地显示出锁定区涡脱落过程、近尾迹流场随振动频率和振幅的演化规律,从而对振动柱波动升力与相位变化的物理机制获得进一步认识。Abstract: Experiments on a square-sertion cylinder fixed and forced to oscillate transversely in uniform stream were conducted in a water tank. The Reynolds number of the experiments is in the range 3·103 to 104, the amplitude to side length ratio A/D is up to 0.7 and the range of reduced velocity 4.5≤Vt≤12.This study aims at investigating the lock-in phenomenon, fluctuating lift and the phase shift between fluctuating lift and displacement of the oscillating cylinder. The problems on the aeroelastic instability rela...
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Key words:
- oscillating cylinder /
- fluctuating force /
- vortex-shedding /
- near-wake /
- lock-in
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