中文摘要：

流固耦合条件下风力机的叶片变形及振动分析对大型风力机的安全具有重要意义。采用k-SST紊流模型和滑移网格技术,对美国国家可再生能源实验室5 MW海上风力机叶片进行了流固耦合计算分析。结果表明：叶片在额定风速流固耦合作用下会发生挥舞方向、摆振方向变形和扭转变形,越接近叶梢,叶片变形就越大而且变形呈非线性分布,而在叶片中段容易出现应力集中区;考虑叶片流固耦合作用时叶片所受到的持续平均气动力略大于未考虑叶片流固耦合作用时的情况;叶片流固耦合作用使叶片气动攻角、扭矩增大;而叶片攻角增大是导致叶片扭矩增大的主要原因。

英文摘要：

The analysis of blade deformation and vibration under fluid-structure interaction is of great significance for the security of large wind turbine. Fluid-structure interaction computation analysis was carried out on the blade of a 5 MW offshore wind turbine under NREL using the k-co SST model and sliding meshes. The results show that blade deformation will occur on flap-wise direction, edge-wise direction and torsional direction under the rated wind speed fluid-structure interaction effect, and the deformation increases approaching to the blade tip with non-linear distribution. The area of stress concentration is likely to occur in the middle of the blade. The average aerodynamic force with fluid-structure interaction being taken into account is slightly higher than that without consideration of it. Aerodynamic attack angle and torque of blade increase under fluid-structure interaction. The increase of attack angle is the main reason for the increase of torque.