摘要
风机叶片是风力发电系统的关键部件之一,由于其外形大、工序复杂,铺层过程中很容易产生褶皱。褶皱会对产品的性能产生不可忽略的影响。当玻纤铺设松散时,就会出现复合层褶皱,如果玻纤方向偏离15,°,玻纤强度就会降低约50%,。褶皱出现在主复合层将造成叶片的破裂。风电叶片的叶根区域是所有载荷的汇集区,载荷大、受力复杂且容易出现褶皱。为有效评估褶皱对疲劳性能的影响,对2,MW复合材料风电叶片叶根铺层结构进行模拟。结果表明:对于复合材料风电叶片,叶根区域褶皱高宽比达到0.1时,随循环次数增加,疲劳强度呈显著下降趋势。对于存在褶皱的试验件,随着疲劳循环次数的增多,疲劳循环载荷的均值、极值、载荷幅值均明显降低。
Wind turbine blade is one of the main parts of wind turbine system. Due to large outline and complicatedprocess,the blade is prone to wrinkles during placement, which will have nonignorable effects on blade performance. Ifglass fibers are loose,wrinkles will appear and if the fibers deviate 15,°,the strength will reduce by 50%. Once wrinklesappear on the main composite layer, blade fracture will become inevitable. As the converging point of all loads,blade rootarea is under complicated stresses and is prone to wrinkles. To evaluate influences of wrinkles on fatigue resistance of 2.0MW composite wind turbine blade, this paper simulates the blade root layering structure. The results showed that the fatigueresistance decreased obviously as cycle times grew when the depth-width ratio of blade root area reached 0.1. For the samplewith wrinkles,the average value,extreme value and load amplitude of fatigue cyclic loading decreased sharply as fatiguecycles grew.
出处
《天津科技》
2015年第7期64-65,67,共3页
Tianjin Science & Technology
关键词
复合材料
风电叶片
褶皱
机械性能
composite material
wind turbine blade
wrinkle
fatigue resistance
