INVESTIGATION OF INFLUENCE OF PRE-BEND AND BACKWARD SWEPT GEOMETRIES ON WIND TURBINE BLADE LOADS CONSIDERING BEND-TWIST COUPLING

Ma Xinwen; Sun Jingwei; Chen Yan; Peng Xianghua

doi:10.19912/j.0254-0096.tynxb.2024-0449

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (9) : 1-10. DOI: 10.19912/j.0254-0096.tynxb.2024-0449

INVESTIGATION OF INFLUENCE OF PRE-BEND AND BACKWARD SWEPT GEOMETRIES ON WIND TURBINE BLADE LOADS CONSIDERING BEND-TWIST COUPLING

Ma Xinwen^1~3, Sun Jingwei^1,2, Chen Yan^1,2, Peng Xianghua⁴

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Abstract

To investigate the effects of pre-bend and varying backward swept geometrical design on the aeroelastic loads of flexible wind turbine blades, a rotation matrix was utilized to accurately describe the airflow velocity, blade displacement, orientation and vibration velocity at blade elements, which were introduced to modify the blade element momentum model and ultimately form an aeroelastic simulation model. Based on the DTU 10 MW blade, three blades with different backward swept geometries were designed, and static, dynamic, and aeroelastic coupling analyses were conducted on each blade variant. The study explores the effects of bend-twist coupling deformations on the blade angle of attack and the influence of increased aerodynamic force arms due to pre-bend and backward swept geometric design on root torque. The study reveals that the bend-twist coupling effects of the blades are significantly influenced by the blade's geometric shape. The backward swept blade shows the best performance in reducing flap-wise root fatigue loads by up to -11.14%, albeit significantly increasing the torsional root fatigue loads. Conversely, the pre-bend blade demonstrates a decrease in both flapwise and torsional root fatigue loads.

Key words

wind turbine blades / aeroelasticity / fatigue load / blade element momentum model correction / bend-twist coupling

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Ma Xinwen, Sun Jingwei, Chen Yan, Peng Xianghua. INVESTIGATION OF INFLUENCE OF PRE-BEND AND BACKWARD SWEPT GEOMETRIES ON WIND TURBINE BLADE LOADS CONSIDERING BEND-TWIST COUPLING[J]. Acta Energiae Solaris Sinica. 2025, 46(9): 1-10 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0449

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