DYNAMIC STALL CHARACTERISTICS AND FLOW MECHANISM OF WIND TURBINE AIRFOIL UNDER COUPLING OF WIND, WAVE AND CURRENT

Hu Chuanxin; Zhou Tao; Huang Wen; Zhao Lin; Wu Kaiming

doi:10.19912/j.0254-0096.tynxb.2025-1087

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (12) : 370-378. DOI: 10.19912/j.0254-0096.tynxb.2025-1087

DYNAMIC STALL CHARACTERISTICS AND FLOW MECHANISM OF WIND TURBINE AIRFOIL UNDER COUPLING OF WIND, WAVE AND CURRENT

Hu Chuanxin^1,2, Zhou Tao¹, Huang Wen¹, Zhao Lin³, Wu Kaiming⁴

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Abstract

This study employs overset grid technology to numerically simulate the pitch-plunge dynamic stall of the DU93-W-210 airfoil under wind-wave-current coupling. Three conditions are analyzed： pure wind, non-synchronous frequencies （fa≠fw）, and synchronous frequencies （fa=fw）. Results demonstrate the simulation's stability and effectiveness. The coupled input excites additional low-frequency components and increases aerodynamic energy input. Dynamic stall angles decrease progressively： 22.9° （pure wind）>21.7° （non-synchronous）>11.1° （synchronous）. Non-synchronous waves induce early flow separation at high angles of attack, while synchronous coupling causes significantly premature stall. Fluctuating pressure on the airfoil upper surface exhibits wave-like changes, characterized spatially by forward-propagating wave crests with decreasing peaks followed by backward propagation with increasing peaks. Temporally, the sequence of minimum pressure occurrence differs： non-synchronous precedes pure wind, and synchronous precedes non-synchronous. This timing aligns with stall angle variation, indicating that separation bubble evolution （expansion/contraction, trailing-edge vortex drift） governs the stall process.

Key words

wind wave and current combined action / wind turbine / airfoil / dynamic stall / coupled oscillation / overset grid

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Hu Chuanxin, Zhou Tao, Huang Wen, Zhao Lin, Wu Kaiming. DYNAMIC STALL CHARACTERISTICS AND FLOW MECHANISM OF WIND TURBINE AIRFOIL UNDER COUPLING OF WIND, WAVE AND CURRENT[J]. Acta Energiae Solaris Sinica. 2026, 47(12): 370-378 https://doi.org/10.19912/j.0254-0096.tynxb.2025-1087

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