大型化风力机叶片质量的快速增加将导致系统结构遭受诸多挑战,故有必要针对风力机叶片开展轻量化设计。论文提出应用于风力机叶片的内肋结构,参考植物叶脉及飞机机翼建立四种不同内肋构型,结合铺层设计实现叶片轻量化,并对叶片在极端风况不同偏航角下结构性能进行分析以验证其可靠性。结果表明：较传统叶片,平行内肋叶片分别减重2.81%与3.37%,而叶脉仿生内肋叶片重量分别降低6.9%和7.7%,且所有叶片均能满足刚度、强度和稳定性的结构需求；叶脉内肋叶片的挥舞位移较传统叶片均减小,而四种内肋结构叶片的摆振位移均增加；叶脉仿生内肋叶片的表面最大应力增大,平行内肋叶片表面最大应力减小；各内肋叶片腹板最大应力均增加,但并未超出材料极限；仿生叶脉内肋叶片屈曲因子有所降低,但总体仍满足稳定性要求。

The rapid increase in the mass of large-scale wind turbine blades will lead to many challenges to the system structure, so it is necessary to carry out lightweight design for wind turbine blades. In this paper, the inner rib structure applied to wind turbine blades is proposed. Four different inner rib configurations are established with reference to plant veins and aircraft wings. The blade lightweight is realized by combining the ply design, and the structural performance of the blade under different yaw angles in extreme wind conditions is analyzed to verify its reliability. The results show that compared with the traditional blade, the weight of the parallel inner rib blade is reduced by 2.81 % and 3.37 % respectively, while the weight of the vein bionic inner rib blade is reduced by 6.9 % and 7.7 % respectively, and all the blades can meet the structural requirements of stiffness, strength and stability. The flapping displacement of the inner ribbed blade is smaller than that of the traditional blade, while the shimmy displacement of the four inner ribbed blades is increased. The maximum stress on the surface of the bionic inner rib blade increases, and the maximum stress on the surface of the parallel inner rib blade decreases. The maximum stress of each inner rib blade web increases, but does not exceed the material limit; the buckling factor of the bionic inner rib blade is reduced, but the overall stability still meets the stability requirements.

TK83

国家自然科学(52106262,52376204)；上海市IV类高峰学科-能源科学与技术-上海非碳基能源转换与利用研究院建设项目。Fund-supported Project: National Natural Science Foundation of China (52106262,52376204);the construction project of Shanghai Institute of Non-Carbon-based Energy Conversion and Utilization, Shanghai IV Peak Disciplines-Energy Science and Technology.