Experimental study of measurement of free oscillations of a cylinder with fin in wind tunnel under different Reynolds

Document Type : Original Article

Authors

• Hayatollah Adavi ¹
• Hassan Isvand ²
• Arash shams taleghani ¹

¹ Aerospace Research Institute, Tehran, Iran

² Department of Aerospace Engineering, Shahid Sattari Aeronautical University

10.22067/jacsm.2023.80578.1157

Abstract

The purpose of this study is to investigate the behavior of a cylinder with three fins in the presence of free air flow. This study aims to investigate the unsteady aerodynamic flow with respect to its practical significance in aviation. Considering the degree of freedom of movement within the geometry and the complexity of the vortex masses that cause instability, it is essential to accurately predict the different dynamic behaviors. We have investigated the dynamic behavior of the model with different length ratios, free flow speeds, and angles of attack. According to the results of the study, rotational and oscillating behaviors, as well as a combination of both, are observed, and they are dependent upon the geometrical characteristics of the model, such as the ratio of the length of the plates to the radius of the cylinder, as well as the angle of attack When the aspect ratio and free flow speed are low, the motion pattern is damped around 60 degrees and the motion regime is oscillatory in nature, which changes to rotational motion as the aspect ratio and flow speed increase. The maximum oscillation or rotation is related to the initial angle of attack of zero degrees. It has been observed that rotational motion regimes occur with an increase in the longitudinal ratio and free flow speed at low initial angles of attack.

Keywords

• Unsteady flow
• Oscillatory and rotational movements
• Reynolds number
• Strouhal number

Main Subjects

• Aerodynamics

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References

1. Feng, “The measurement of vortex induced effects in flow past stationary and oscillating circular and d-section cylinders, M.S thesis,” The University of British Columbia, Canada, 1968.
2. Amandolese, and P. Hemon, “Vortex-induced vibration of a square cylinder in wind tunnel,” Journal of Comptes Rendus Mecanique, vol. 338, no. 1, pp. 12-17. 2010,
3. Umemura, T. Yamaguchi, and K. Shiraki, “On the vibration of Cylinders caused by Karman Vortex,” Bulletin of Japan Society of Mechanical Engineering, vol.14, no.75, pp. 929-936, 1971.
4. Sarpkaya, “Vortex-induced vibrations, A selective review,” Journal of Applied Mechanics, vol. 46, no. 2, pp. 241-258. 1979.
5. Sarpkaya, “A critical review of the intrinsic nature of vortex induced vibration,” Journal of Fluids and Structures, vol. 19, no. 4, pp. 389-447. 2004.
6. H. Scanlan, and R. Rosenbaum, “Introduction to the study of Aircraft Vibration and Flutter,” Mineola: Dover, 1968.
7. Lin, “ On the vortex shedding around a circular cylinder modulated by ambient density stratification,” Ocean Engineering, vol. 266, 15 December 2022.
8. Xu, H. Wang, Y. Deng, X. Shen, L. Geng, K. Liu, and D. Zhang, “ Nonlinear vortex dynamic analysis of flow-induced vibration of a flexible splitter plate attached to a square cylinder,” Ocean Engineering, vol. 264, 15 November 2022
9. Song, Z. Liu, A. Rønnquist, P. Nåvik, and Z. Liu “Contact wire irregularity stochastics and effect on high-speed railway pantograph–catenary interactions,” IEEE Transactions on Instrumentation and Measurement, vol. 69, no.10, pp.8196–8206. 2020
10. Song, Z. Wang, Z. Liu, and R. Wang, “A spatial coupling model to study dynamic performance of pantograph-catenary with vehicle-track excitation,” Mechanical Systems and Signal Processing, vol. 151, 107336. 2021
11. Wang, L. Geng, L. Ding, H. Zhu, and D. Yurchenko, “The state-of-the-art review on energy harvesting from flow-induced vibrations,” Applied Energy, vol. 267, 114902. 2020
12. Wang, Z. Su, H. Li, L. Ding, H. Zhu, and O. Gaidai, “Imposing a wake effect to improve clean marine energy harvesting by flow-induced vibrations,” Ocean Engineering, vol. 208, p.107455. 2020
13. Jafari, F. Hou, and A. Abdelkefi, “Wind-induced vibration of structural cables,” Nonlinear Dynamics, vol. 100, no.1, pp. 351–421, 2020.
14. Xu, H. Yu, M. Zhang, and Y. Han, “Experimental study on aerodynamic characteristics of a large-diameter ice-accreted cylinder without icicles,” Journal of Wind Engineering and Industrial Aerodynamics, vol. 208, p.104453, 2021.
15. Bao, Y. Lin, W. Chen, C. Kyu Rheem, and X. Li, “Numerical investigation of wake and flow-induced vibrations of a rotating cylinder in flow,” Ocean Engineering, vol. 262, 15 October 2022.
16. Hong , and G. Son, “Numerical simulation of cavitating flows around an oscillating circular cylinder,” Ocean Engineering, vol. 226, 15 April 2021.
17. Ali, M.D. Islam, and I. Janajreh, “Flow over rotationally oscillating heated circular cylinder at low Reynolds number,” Ocean Engineering, vol. 265, 1 December 2022.
18. Jauvtis, and C.H.K. Williamson, “Vortex-induced vibration of a cylinder with two degrees of freedom,” Journal of Fluids and Structures, vol. 17, pp.1035–1042, 2003.
19. L. Pontaa, and H. Arefb, “Numerical experiments on vortex shedding from an oscillating cylinder,” Journal of Fluids and Structures Journal of Fluids and Structures, vol. 22, no. 3 pp. 327–344, 2006.