某型风力发电机组叶片的双向流-固耦合探究

Research on Bidirectional Fluid-structure Coupling of Wind Turbine Generator System Blades

为探究风力发电机组叶片的压力、应力、应变与变形的分布特征,探明叶片的危险薄弱部位,揭示其分布特征的内在机制,基于ANSYS Workbench环境平台,采用双向流-固耦合方法对某型风力发电机组叶片的流场与固体场进行耦合计算,探究叶片在耦合场中的压力、应力、应变与变形规律,为叶片的结构优化设计制造与疲劳断裂寿命计算等提供理论方法支撑。结果如下:叶片在外界风速流场中的压力分布与实际工况相符;叶片的最大应力、应变位置位于叶片的根部,应力与应变呈现"根高尖低"的分布特点;最大变形位置位于叶片的尖端处,变形呈现"半径化梯度性减小"的分布特点。以上研究结果可为叶片的安全检查、定期维修与优化改进等提供参考,具有实际工程价值。

To explore the distribution characteristics of pressure,stress,strain and deformation of wind turbine generator system blades,find out the dangerous weak parts of the blades,and reveal the internal mechanism of their distribution characteristics,based on ANSYS Workbench platform,the bidirectional fluid-structure coupling method was used to calculate the flow field and solid field of a certain type of wind turbine generator system blades.The laws of the pressure,stress,strain,and deformation of the blade in the coupling field were explored,which provided theoretical support for the structural optimization design and manufacturing and fatigue fracture life calculation of the blade.The results show that the pressure distribution of the blade in the external wind speed field is consistent with the actual working conditions;the maximum stress and strain of the blade are located at the root of the blade,and the distribution characteristics of the stress and strain are"root high and tip low";the maximum deformation position is located at the tip of the blade,and its deformation presents the characteristics of"radial-gradient reduction".The above research results can provide reference for blade safety inspection,regular maintenance and optimization improvement,and have practical engineering value.