Control of two-degree-of-freedom vortex-induced vibrations of a circular cylinder using a pair of synthetic jets at low Reynolds number: Influence of position angle and momentum coefficient

被引:26
作者
Wang, Haibo [1 ,2 ]
Ding, Lin [1 ,2 ]
Zhang, Li [1 ,2 ]
Zou, Qunfeng [1 ,2 ]
Wu, Chunmei [1 ,2 ]
机构
[1] Chongqing Univ, Key Lab Low Grade Energy Utilizat Technol & Syst, Minist Educ China, Chongqing, Peoples R China
[2] Chongqing Univ, Sch Energy & Power Engn, 174 Shazheng St, Chongqing 400044, Peoples R China
基金
中国国家自然科学基金;
关键词
Vortex-induced vibration; Two-degree-of-freedom; Circular cylinder; Synthetic jets; Active control; FLOW-INDUCED VIBRATION; FREE-SURFACE; SUPPRESSION; WAKE; SEPARATION;
D O I
10.1016/j.ijheatfluidflow.2019.108490
中图分类号
O414.1 [热力学];
学科分类号
摘要
In order to understand the effects of synthetic jets on the active control of two-degree-of-freedom (2DOF) vortex-induced vibrations (VIVs) of a circular cylinder, a series of numerical simulation were carried out at Reynolds number of 150. The synthetic jet excitation frequency was fixed at five times of the natural frequency of the cylinder in still water. The influence of two key parameters of synthetic jets, the position angle (a) and the momentum coefficient (Cu), on 2DOF VIVs was analyzed. Results indicated that both in-flow oscillation and cross-flow oscillation can be suppressed when the synthetic jets with sufficient momentum coefficient were positioned at the circular cylinder's leeward side (0 degrees <= alpha <= 75 degrees). When Cu = 4, 15 degrees <= alpha <= 60 degrees, the reductions of cross-flow and in-flow oscillation amplitudes were all larger than 99% and 70%, respectively. Besides, the inflow oscillation frequency was locked-in to the excitation frequency of synthetic jets when the in-flow oscillation was effectively suppressed. A symmetric wake can be observed when the cross-flow oscillation was completely suppressed, and the 2P + 2S vortex pattern can be observed when Cu = 4, alpha =165 degrees and 180 degrees.
引用
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页数:15
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