【摘要】 随着风力机叶片日趋长展化,对其抗弯性能的要求也日益提高。受毛竹竹节规律性分布及其隔板支撑竹竿结构的启发,提出在叶片内部添加环形剪切腹板,建立带有环形剪切腹板的叶片受力模型,利用MATLAB软件,以一台750 kW风力机为研究对象进行数值仿真,得到翼型截面惯性矩,最大应力和翼型相对厚度减小量分别随内、外弦长之比和叶片展长的变化趋势。结果表明,叶片根部的抗弯性能显著提高;当内外弦长之比设为0.4时,环形腹板叶片与实心腹板叶片的抗弯强度几乎相同,且环形腹板的使用可以使叶片总质量更轻。更多还原

【Abstract】 As the blades of wind turbines tend to be longer and thinner, the demand for their bending strength is increasing day by day. Inspired by the regular distribution of bamboo node and the node diaphragms supporting the culm, a shear web was proposed to be added inside the blade in this paper. A forced blade model with ring shear webs was set up, and then a numerical simulation was performed on one 750 kW wind turbine by MATLAB software. Subsequently, the changing trends of the inertia moment, the maximum stress and the relative thickness reduction, respectively, along with the ratio of the inner chord length to the outer one and the blade span were gained. It is concluded that the bending strength around the blade root increases greatly. It also indicates that the bending strength of blades with ring shear webs is almost the same as the ones with solid shear webs when the ratio of the inner chord length to the outer one is set as 0.4.Moreover, the use of ring shear webs contributes to lighter blades.更多还原