Dynamic mode decomposition analysis of flow separation control on wind turbine airfoil using leading−edge rod

Junwei Zhong, Jingyin Li and Huizhong Liu

Energy, 2023, vol. 268, issue C

Abstract: The mechanism of a novel passive flow separation control method for a wind turbine, called the leading-edge rod, was investigated using numerical simulation and dynamic mode decomposition (DMD). The 3D unsteady flow fields around the original and controlled airfoils were simulated using the delayed detached eddy simulation (DDES) turbulence model. The results show that the spanwise vortices shedding from the rod alternately induce clockwise and anticlockwise rotating vortices in the boundary layer, which enhance the momentum mixing between the outer and inner layers in the boundary layer. The excited boundary layer suppresses the large-scale flow separation at large angles of attack, which improves the aerodynamic performance of the airfoil. The DMD modes of the controlled airfoil have three types of high-order flow modes: the first one represents the shear vortices shedding from the inner side of the rod; the second one represents the shedding of the vortex street from the rod and the third one represents small-scale vortices shedding from the trailing-edge. Flow reconstruction shows that Mode 1 representing the mean flow plus the representative modes of the three types of high-order flow modes can reconstruct the flow field with acceptable precision.

Keywords: Flow separation control; Wind turbine airfoil; Numerical simulation; Dynamic mode decomposition (search for similar items in EconPapers)
Date: 2023
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:268:y:2023:i:c:s0360544223000506

DOI: 10.1016/j.energy.2023.126656

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