针对水平轴风力机桨叶片, 在结冰条件下进行了三维有限元模态仿真, 并对桨叶片结冰后是否能引起桨叶片 结构共振进行分析, 对桨叶片固有频率进行了对比。根据研究内容, 首先确定桨叶片的几何参数, 并通过Pro / E 软 件绘制叶片的三维实体图。主要通过Fluent 软件对三维桨叶片进行结冰模拟, 之后采用ANSYS 结构分析软件对 结冰后的桨叶片进行仿真, 提出分块法Blo ck Lanczos 对叶片进行重力预应力模态分析, 应用多体动力学的方法, 材 质采用玻璃钢, 确定叶片的各阶模态振型、频率、最大变形量, 得出了叶片的前10 阶模态数值与分析结果, 并对结果 进行了分析比较。结果显示结冰后叶片的主要振动形式为摆振和挥舞, 有较强的抗扭转能力, 设计中应加强叶片的 弯曲刚度, 这为风力机叶片的设计和优化提供了参考。

In this paper , a three2dimensio nal f inite element model of the blade o f w ind turbine with hor izontal ax is w as car ried o ut under the icing co ndit ions. The resonance of impeller blade str ucture was analyzed under the icing conditio ns and the natura l f re2 quency of blade w as compar ed. Accor ding to the research content, t he g eometr ic parameter s of the impeller blades wer e deter2 mined, and the 3D so lid draw ing o f the blades w as per formed using the Pr o/ E softw are. The Fluent soft war e w as used to simu2 late the icing conditio ns of thr ee2dimensional blade, and the ANSYS st ructur e analysis so ftw are was used to simulate the f rozen blade. The Lanczo s Blo ck was used to perfo rm the analy sis o f g rav itatio na l pr elo ad of the blade. The multi2body dynamics meth2 o d w as used to determine the v ibration t ype, mode, and max imum displacement of each or der of blade. The numerical simulatio n and analysis results of the first 102or der o f blade wer e o btained and compar ed. The r esults show ed that the main vibrat ion mode of the blade is shimmy and w aving , and the blade has a stro ng resistance ability to to rsio n. Therefo re, t he desig n o f blade sho uld st reng then t he bending rig idity , w hich pr ovides refer ence for the desig n and o pt imizatio n o f wind turbine blade.

国家科技支撑计划项目( 2007BAF12B01)