INFLUENCE OF DIFFERENT PULSATION SOURCES ON ANGLE OF ATTACK AND UNSTEADY AERODYNAMIC CHARACTERISTICS OF WIND TURBINE

Li Yinran; Wei Kui; Guo Xingduo; Zhang Sucai; Liu Yinhuan

doi:10.19912/j.0254-0096.tynxb.2024-1439

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (12) : 589-598. DOI: 10.19912/j.0254-0096.tynxb.2024-1439

INFLUENCE OF DIFFERENT PULSATION SOURCES ON ANGLE OF ATTACK AND UNSTEADY AERODYNAMIC CHARACTERISTICS OF WIND TURBINE

Li Yinran^1,2, Wei Kui¹, Guo Xingduo¹, Zhang Sucai¹, Liu Yinhuan¹

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Abstract

Four unsteady pulsation sources including turbulence, yaw, shear flow and tower shadow are constructed, and large eddy simulation was used to study the influence of the unsteady pulsation sources on the angle of attack and aerodynamic unsteady characteristics of the wind turbine airfoil. The study shows that under yaw and wind shear conditions, the angle of attack and lift coefficient both show an approximate sine and cosine fluctuation pattern. Under tower shadow conditions, the angle of attack and lift coefficient drop sharply near an azimuth angle of 180°. Under turbulence conditions, the angle of attack shows randomness in both time and space dimensions. Except for wind shear, the fluctuation amplitude of the angle of attack and lift coefficient under other working conditions increases roughly from the tip to the root of the blade. The unsteady pulsation source greatly increases the pressure fluctuations on the leading edge of the pressure side and the suction side, and the increase is more obvious as it approaches the blade tip; In addition, the pressure fluctuation on the suction side of the blade is greater than that on the pressure side. Turbulence is an unsteady pulsation source that induces most significant fluctuations in the blade angle of attack, lift coefficient, and pressure. The incoming velocity spectrum shows a slope of -5/3 in the inertial subrange, while the output power spectrum shows a slope of -11/3. There exists a nonlinear interaction between these two slopes. Furthermore, the pressure fluctuations caused by turbulence near the leading edge exhibit strong periodicity and respond more intensely to large-scale turbulence.

Key words

wind turbines / unsteady / lift / angle of attack / pressure / turbulence

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Li Yinran, Wei Kui, Guo Xingduo, Zhang Sucai, Liu Yinhuan. INFLUENCE OF DIFFERENT PULSATION SOURCES ON ANGLE OF ATTACK AND UNSTEADY AERODYNAMIC CHARACTERISTICS OF WIND TURBINE[J]. Acta Energiae Solaris Sinica. 2025, 46(12): 589-598 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1439

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