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基于ANSYS软件,对某款1500kW大型水平轴风力机叶片的应力特征进行了分析。该水平轴风力机叶片在极限挥舞载荷的作用下,叶片大梁和叶根的整体应力水平比较高,而剪切腹板和翼板上的整体应力水平比较低,这说明叶片大梁和叶根是叶片的主要承力部件,而剪切腹板和翼板主要作用是维持叶片结构的稳定性。另外,在叶根与剪切腹板相接的角点上存在应力集中现象,其最大应力为228MPa,但是,剔除应力集中点后,叶片大梁上的应力比叶根高,叶片大梁中部约1/3区域的应力都比较高,其最大应力为211MPa,平均应力为180MPa左右。此外,该叶片的最大应力仅为所采用的玻纤/环氧复合材料拉伸强度的34.8%,说明该叶片的铺层结构设计是偏于安全的,可以适当提高叶片挂机运行时的额定发电功率。
Based on the ANSYS software, the stress characteristics of a 1500 kW large horizontal axis wind turbine blade are analyzed. Under the action of the limit waving load, the horizontal stress of the blade girder and the root of the blade is relatively high while the overall stress level of the shear web and the blade is relatively low, which shows that the blade girder and the root of the blade are The main bearing component of the blade, while the shear web and the main function of the wing is to maintain the stability of the blade structure. In addition, there is stress concentration at the corner where the root of blade intercepts with the shear web, and its maximum stress is 228 MPa. However, after stress concentration point is removed, the stress on the blade girder is higher than that on the blade root, and about 1 / 3 area are relatively high stress, the maximum stress of 211MPa, the average stress of about 180MPa. In addition, the maximum stress of the blade is only 34.8% of the tensile strength of the glass fiber / epoxy composite used, indicating that the design of the ply structure of the blade is biased to be safe and the rated power generation during the on-hook operation of the blade can be appropriately increased power.