半潜式海上风力机流固耦合特性分析

Analysis of Fluid-Structure Coupling Characteristics of Semi-submersible Offshore Wind Turbines

根据美国国家可再生能源实验室给出的风力机数据,利用Pro E软件建立5 MW半潜式海上风力机模型,通过仿真软件进行双向流固耦合模拟,探究基于双向流固耦合半潜式风力机风轮在耦合作用时产生的形变及等效应力应变情况。通过分析风力机自存状态以及不同风浪条件下风力机的运行情况可知:作为风力机最重要的部分,风力机叶轮随着转速增大,产生的形变增大,同时形变峰值会越早出现;风轮最大等效应力出现于运行初始阶段,随着时间的推移,应力最终稳定在一定范围内;风力机的形变程度随风速的增大而增大;在风力机运行过程中系泊缆随浮筒一起做周期性运动。研究结果可为海上半潜式风力机安全稳定运行提供参考,同时为设计海上半潜式风力机提供借鉴。

Based on the wind turbine data provided by the American National Renewable Energy Laboratory(NREL), the manuscript was used ProE to establish a 5 MW offshore semi-submersible wind turbine model. A two-way fluid-structure coupling simulation through simulation software was conducted. The research was based on the deformation and equivalent stress of the two-way fluidstructure coupling semi-submersible wind turbine blade during the coupling action. The shutdown state of the wind turbine and the operation of the wind turbine under different wind and wave conditions were analyzed. The analysis shows that the blade is the most important part of the wind turbine.As the speed of impeller increases, the deformation increases,and the peak value shifts to the left. The maximum equivalent stress of the wind wheel appears in the initial stage of operation. As time goes by, the stress finally stabilizes within a certain range. The degree of deformation of the blade increases with the increase of wind speed. During the operation of the wind turbine, the mooring line moves periodically with the float foundation. This research provides a reference for the safe and stable operation of offshore semisubmersible wind turbines, and at the same time provides a reference for the design of offshore semi-submersible wind turbines.