均匀流场中串列阶梯圆柱流致振动实验研究

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Abstract Flow-induced vibration of two tandem stepped cylinders in uniform flow is investigated experimentally in the range of Reynolds number from 570 to 5000, with the coverage ratio of the stepped cylinders being R=50% and the spacing ratio being D/d =1.5. In the experiments, the upstream cylinder is fixed and the downstream cylinder vibrates freely in the cross-flow direction. Four spacing ratios of s/D* = 2, 4, 8 and 16 are investigated with the in-phase and out-of-phase arrangements of the upstream and downstream cylinders being considered. The results show that the spacing ratio has a significant effect on the interaction between the tandem stepped cylinders, and a change in spacing ratio alters the gap flow pattern between the cylinder which leads to the different vibration characteristics of the downstream cylinder. For the out-of-phase arrangement of the tandem cylinders, the downstream cylinder undergoes wake-induced vibration when the spacing ratio is small and the reduced velocity is high. That is, the amplitude increases significantly with the increasing reduced velocity. However, when the spacing ratio s/D* ≥ 8, the influence of the geometry shape phase is negligible.

Key words： tandem cylinders stepped cylinder flow-induced vibration spacing ratio

Received: 23 August 2022 Published: 28 July 2023

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	Articles by authors
	JI Chunning1
	ZHANG Yan1
	YIN Tong1
	ZHAO Yawei1
	YUAN Dekui2
	XU Dong1

Cite this article:

JI Chunning1,ZHANG Yan1,YIN Tong1, et al. Experimental study on the flow-induced vibration of two tandem stepped cylinders in uniform flow[J]. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(14): 278-286.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2023/V42/I14/278

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