EFFECT OF AIRFOIL CONCAVITY ON AERODYNAMIC NOISE OF WIND TURBINES UNDER GUST INFLOW

Xing Jianfeng; Ma Jianlong; Su Hongjie; Zhang Liru; Zhang Pengyu; Yu Hao

doi:10.19912/j.0254-0096.tynxb.2021-1552

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (4) : 156-162. DOI: 10.19912/j.0254-0096.tynxb.2021-1552

EFFECT OF AIRFOIL CONCAVITY ON AERODYNAMIC NOISE OF WIND TURBINES UNDER GUST INFLOW

Xing Jianfeng¹, Ma Jianlong^1-3, Su Hongjie¹, Zhang Liru^1-3, Zhang Pengyu¹, Yu Hao¹

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Abstract

Based on the instability of natural wind, a gust function was fitted according to the parameters of the wind turbines. Applying a combination of three-dimensional unsteady simulation and experimental verification on a horizontal axis wind turbines with S-shaped airfoil, the influence of airfoil concavity on the wake radiation acoustic spectrum, acoustic radiation propagation, and wake vorticity dissipation under both gust inflow and stable inflow were studied. The results show that the airfoil concavity can effectively reduce the aerodynamic noise of wake, and its fundamental frequency and high harmonic sound pressure level are significantly lower than those of the original blade. With the increase of axial distance, the noise reduction effect of airfoil concavity blade increases gradually, and the maximum sound pressure level is decreased by 3.6 dB at the axial direction of 500 mm. The noise reduction effect of airfoil concavity blade under the gust inflow is greater than that of the stable inflow. The wake vortex of airfoil concavity blade also has a significant decrease, which verifies the effectiveness of airfoil concavity on the aerodynamic noise reduction.

Key words

wind turbines / sound pressure level / vorticity / blades / gust inflow / airfoil concavity

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Xing Jianfeng, Ma Jianlong, Su Hongjie, Zhang Liru, Zhang Pengyu, Yu Hao. EFFECT OF AIRFOIL CONCAVITY ON AERODYNAMIC NOISE OF WIND TURBINES UNDER GUST INFLOW[J]. Acta Energiae Solaris Sinica. 2023, 44(4): 156-162 https://doi.org/10.19912/j.0254-0096.tynxb.2021-1552

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