Suppression of vortex-induced vibration of a circular cylinder by a passive-jet flow control

• Published in: Journal of wind engineering and industrial aerodynamics Vol. 199; p. 104119
• Main Authors: Chen, Wen-Li, Chen, Guan-Bin, Xu, Feng, Huang, Ye-wei, Gao, Dong-Lai, Li, Hui
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.04.2020
• Subjects: Linear correlation analysis; Passive jets; Reynolds shear stress; Vortex-induced vibration; Passive jets; Linear correlation analysis; Reynolds shear stress; Vortex-induced vibration
• ISSN: 0167-6105; 1872-8197
• DOI: 10.1016/j.jweia.2020.104119

In this study, vortex-induced vibrations (VIVs) of a spring system-supported circular cylinder model are suppressed via passive-jet flow control in wind tunnel experiments. A laser displacement measurement system is employed to obtain the vibration response of the test model with and without a passive-jet control scheme. The results indicate that the VIV oscillation amplitudes and frequency lock-in ranges of the controlled models are smaller than those of the baseline case. In addition to the vibration measurements, the pressure distribution in the test model is measured with a digital pressure measurement system. According to the surface pressure results, the mean pressures of the leeward surface are lifted, and the root-mean-square (RMS) pressures on the cylinder surface are suppressed compared with those of the baseline case. Moreover, in the controlled cases, the mean drag and lift fluctuations are remarkably alleviated, and the Reynolds shear stress in the cylinder wake decreases considerably. All results indicate that the effectiveness of the passive-jet flow control in this investigation is determined by the spacing of two neighboring jet pipes. Moreover, a linear correlation analysis of the surface pressures reveals that the correlation of the external surface pressure is tremendously disturbed by the passive-jet flow control. The passive-jet flow control by jet pipe equipping on the periphery of a elastically-supported circular cylinder forms the windward suction and leeward jets to interrupt the strongly correlation of external surface pressure on the test model and suppress the quasi-periodic vortex shedding process in the cylinder wake. As a result, the vortex-induced vibrations of the circular cylinder are mitigated. [Display omitted] •A passive-jet flow control method was investigated to suppress the vortex-induced vibrations of a circular cylinder.•A notable reduction in the fluctuations of both surface pressures and aerodynamic coefficients were achieved.•The periodic vortex shedding was alleviated, and the separation point was shifted with the passive-jet flow control.