结冰对风力发电机叶片模态参数影响的试验研究  

EXPERIMENTAL STUDY ON THE EFFECT OF ICE COATING ON THE MODAL PARAMETERS OF WIND TURBINE BLADES

作　　者：陈红星 崔红梅[1] 李飞宇 CHEN Hongxing;CUI Hongmei;LI Feiyu(College of Mechanical arid Electrical Engineering in Inner Mongolia Agricultural University,Hohhot 010018,China)

机构地区：[1]内蒙古农业大学机电工程学院,呼和浩特010018

出　　处：《内蒙古农业大学学报（自然科学版）》2020年第6期74-78,共5页Journal of Inner Mongolia Agricultural University(Natural Science Edition)

基　　金：国家自然科学基金项目(11262015);内蒙古自治区人才基金;内蒙古农业大学优秀青年科学基金项目(2014XYQ-9)。

摘　　要：风力机叶片结冰后会影响风力发电机组正常工作,甚至会使叶片产生共振折断叶片。为了探究结冰对叶片模态参数的影响,利用脉冲激励法对一个2 kW的玻璃钢风力发电机叶片进行了结冰模态试验,得到了不同结冰状态下叶片的前4阶振型和固有频率,并与没有结冰时叶片的振型和固有频率进行了对比。结果表明,叶片根部结冰对叶片第4阶振型有影响,叶片根部结冰使叶片第4阶振型由扭转振型变为了挥舞振型。叶中和叶根结冰时,叶片前4阶振型的不变。叶片在不同部位结冰时,对叶片固有频率的影响不同。在叶尖处结冰对叶片第1阶固有频率影响最大,降低了5.67%~14.82%,叶中部结冰对叶片第4阶固有频率影响最大,降低了2.95%~10.80%。Wind turbine blades icing affects the normal operation of wind turbines,and even causes the resonance breaking of blades.In order to investigate the influence of icing on the blade modal parameters,the icing modal test was carried out on a 2 kW wind turbine blade by using the impulse excitation method.The first four modes and natural frequencies of the blades under different icing conditions were obtained,and compared with those of the blades without icing.The results showed that icing at the root of the blade has an effect on the fourth modal of vibration of the blade.The icing at the root of the blade makes the fourth mode of vibration of the blade change from torsional mode to flag-wise mode.When the blade iced in different parts,the influence on the natural frequency of the blade is different.Icing at the tip of the blade has the greatest impact on the first natural frequency of the blade,which reduces by 5.67%-14.82%,while icing in the middle of the blade has the greatest impact on the fourth natural frequency of the blade,which reduces by 2.95%~10.80%.

关 键 词：风力机叶片 结冰 模态试验 

分 类 号：TK89[动力工程及工程热物理—流体机械及工程]