摘要
以300 W小型水平轴风力机风轮为研究对象,建立风力机模型,针对叶片结构进行动态特性有限元分析,主要通过模态分析研究离心载荷对叶片固有频率的影响。结果表明:通过比较模拟与实验值发现误差小于3%,振型节点在0.2R、0.58R、0.79R、0.88R(R为叶片长)。叶片所受离心载荷增加会导致叶片各阶动态固有频率上升,同时其挥舞振型对应的固有频率受载荷影响较大;离心载荷使叶片受到离心刚化作用,从而会使得叶片截面刚度上升,引起叶片动态固有频率升高。
Taking 300 W small horizontal axis wind turbine as the object of the research,the model of the wind turbine was established,in which the dynamic characteristics of the blade structure were analyzed. Based on modal analysis,the influence of centrifugal load on the natural frequency of blade was studied,the results show that the static natural frequency deviation between emulation values and experimentalvalues is less than 3%,and the node location of blade vibration is at 0.2R,0.58R,0.79R,0.88R. The increase in blade load will lead to the increase in the dynamic natural frequencies of the blade,and the flapwise vibration corresponding to the natural frequency is greatly influenced by load.Centrifugal load strengthens the effect of stress stiffening,leading to rise in the stiffness of blade section and increase in the dynamic natural frequency of the blade.
作者
郭俊凯
张嘉奇
汪建文
米兆国
蔺晓甜
Guo Junkai;Zhang Jiaqi;Wang Jianwen;Mi Zhaoguo;Lin Xiaotian(College of Energy and Power Engineering,Inner Mongolia University of Technology,Hohhot 010051,China;Key Laboratory of Wind Energy and Solar Energy of the Ministry of Education,Hohhot 010051,China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2019年第8期2148-2153,共6页
Acta Energiae Solaris Sinica
基金
国家自然基金(51766014)
内蒙古自然基金重大项目(2016ZD04)
关键词
风力机
数值模拟
模态分析
离心载荷
wind turbine
direct numerical simulation
modal analysis
centrifugal load
