为研究风力机柔性叶片预弯和不同后掠几何外形设计对其气弹载荷的影响,利用转动矩阵精确地表征叶素处的气流速度和叶素的位移、方向、振动速度,并对叶素动量模型进行修正建立气弹仿真模型。基于DTU 10 MW叶片分别设计3种不同后掠叶片,对3种叶片进行静力学、动力学和气弹耦合分析。研究叶片弯扭耦合变形对叶片攻角的影响,叶片预弯、后掠引起的气动力臂增大对叶根扭矩的影响。研究发现叶片的弯扭耦合效应受叶片的几何外形影响较大,后掠叶片对降低叶根的挥舞疲劳载荷效果最好,达到-11.14%,但会大幅增大叶根扭转疲劳载荷,预弯叶片会减小叶根的挥舞和扭转疲劳载荷。
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.
关键词
风力机叶片 /
气动弹性 /
疲劳载荷 /
叶素动量模型修正 /
弯扭耦合
Key words
wind turbine blades /
aeroelasticity /
fatigue load /
blade element momentum model correction /
bend-twist coupling
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基金
国家重点研发计划（2022YFB4201200）; 广东省自然科学基金面上项目（2023A1515012096）
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