三维角联锁机织与双轴向经编复合材料风力机叶片弯扭耦合特性对比分析

A comparative analysis of bending-torsion coupling characteristics of three-dimensional angle interlocking woven and biaxial warp knitted composite blade

研究了由三维角联锁机织与双轴向经编玻纤织物增强的复合材料叶片其增强体结构对叶片弯扭耦合特性的影响,选用NACA4415为基础翼型,设计了功率为2 kW、长1.9 m风力机叶片,应用Ansys软件数值模拟叶片应变特性,基于节点位移法分析了铺层结构对叶片弯扭耦合特性影响,进而得出增强体结构对叶片变形特性的影响规律。结果表明:在相同集中载荷作用下,同种几何形状的叶片由挠度均随叶片展向递增,并呈非线性相关;铺层结构对叶片的弯扭耦合效应影响较明显,新型结构的三维角联锁机织复合材料风力机叶片等效弯扭耦合系数为0.0616,约为传统的双轴向经编复合材料风力机叶片的2.8倍。

In this paper,the influence of the composite blade reinforcement structure of three-dimensional angle interlocking weaving and biaxial warp knitting glass fiber fabric on the bending-torsional coupling characteristics of the blade is studied.Taking a 2 kW wind turbine blade as the research object,the software Ansys was used to numerically simulate the blade strain characteristics and based on the nodal displacement method,the bending-torsional coupling characteristics of the laminate structure to the blade were analyzed to learn about the influence of the reinforcement structure on the blade deformation characteristics.The results show that under the same concentrated load,the deflection of the blades with the same geometry increases with the blade span,and is nonlinearly correlated.The layup structure has a significant influence on the bending-torsional coupling effect of the blade.The equivalent bending-torsional coupling coefficient of the composite wind turbine blade is 0.0616,which is about 2.8 times that of the traditional biaxial warp-knitted composite wind turbine blade.