高雷诺数下串列粗糙三圆柱的流致振动试验研究

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Abstract Flow-induced vibration (FIV) of three roughness cylinders arranged in tandem is investigated at high Reynolds number. The influence of the spring stiffness and the spacing ratio on amplitude responses, frequency responses and frequency spectrums of displacement responses is analyzed and discussed. Meanwhile, comparison to the experimental results of two tandem roughness cylinders reveals the influence law of the number of the interference cylinder for FIV of the disturbed cylinder. The results show that in the initial branch, the shielding effect of the upstream cylinder on the downstream cylinder is vigorous, whereas in the upper branch, the phenomenon that the amplitude of the downstream cylinder is higher than that of the upstream cylinder appears. In the upper branch and the transition region, increasing the number of the downstream interference cylinder is able to decrease the oscillation frequency of the upstream cylinder. In the vortex-induced vibration region, the increase in the number of downstream interference cylinder scarcely affects the amplitude of the upstream cylinder. In the galloping region, the increase in the number of upstream interference cylinder tends to reduce the amplitude of the downstream cylinder, and this effect becomes weaker with increasing stiffness. The influence of the spacing ratio on the FIV of three tandem roughness cylinders is obvious.

Key words： vortex-induced vibration galloping three tandem cylinders oscillation responses

Received: 19 April 2023 Published: 28 March 2024

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	LI Huaijun
	SUN Hai

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LI Huaijun,SUN Hai. Experimental investigation on the flow-induced vibration of three tandem roughness cylinders in high Reynolds number flow[J]. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(6): 280-287.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2024/V43/I6/280

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