Analysis of dynamic stall control on a pitching airfoil using dynamic mode decomposition

被引:1
作者
Zhong, Junwei [1 ,2 ]
Li, Jingyin [3 ,4 ]
Liu, Huizhong [1 ,2 ]
机构
[1] Jiangxi Univ Sci & Technol, Sch Mech & Elect Engn, Ganzhou, Peoples R China
[2] Jiangxi Univ Sci & Technol, Jiangxi Prov Engn Res Ctr Mech & Elect Min & Met, Ganzhou, Peoples R China
[3] Xi An Jiao Tong Univ, Sch Energy & Power Engn, Xian, Peoples R China
[4] Xi An Jiao Tong Univ, Dept Fluid Machinery & Engn, 28 Xianning Western Rd, Xian 710049, Shaanxi, Peoples R China
基金
中国国家自然科学基金;
关键词
Dynamic stall; wind turbine airfoil; numerical simulation; dynamic mode decomposition; WAKE;
D O I
10.1177/09576509231177103
中图分类号
O414.1 [热力学];
学科分类号
摘要
Dynamic mode decomposition (DMD) technology is used to analyze the control of dynamic stall on a pitching S809 airfoil using an off-surface rod. The unsteady flows around the original and the controlled airfoil are simulated by using the SST k-omega turbulence model. With the introduction of the off-surface rod, the hysteresis effect of the dynamic stall process of the original airfoil is considerably reduced, and the clockwise sub-loop of the pitching moment coefficient is eliminated. The improvement of the dynamic stall process is beneficial to the safe and high-efficiency operations of wind turbine. The coherent structure of the unsteady flow fields are decoupled by the DMD method compiled by an in-house code in MATLAB. Results reveal that the hysteresis effect is dominated by mode 2 with a pitching frequency and mode 3 with twice the pitching frequency. The global energy of the two modes is reduced by the off-surface rod, which alleviates the hysteresis effect for the original airfoil.
引用
收藏
页码:1699 / 1714
页数:16
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