新型半潜式海上风力机基础水动力特性研究

概念性地设计了一种新型半潜式海上风力机基础,确定了结构的型式和尺寸,对风浪联合作用下不同工况的风力机基础稳性进行了校核.考虑黏性阻尼和二阶波浪力的作用,计算分析了风力机基础的水动力系数、幅频运动以及动力响应特性.结果表明,经过改进的新型风力机基础具有良好的稳性和水动力性能,特别是在垂荡性能上有大幅的提升.波浪入射角度对垂荡的影响不大,但对其他自由度RAOs影响较大.垂荡、横摇和纵摇RAOs均存在一个主峰值和次峰值,但峰值周期均远离波能集中区.此外还发现,不同工况下风浪入射角对风机系统的动力响应和系泊力均有较大影响,相对于工作工况,极端工况下所受风荷载较小,但是系泊力更大.

Research on hydrodynamic characteristics of a new semi-submersible floating foundation for offshore wind turbine

Taking a 5 MW wind turbine of NREL as a model, a new type of floating platform for offshore wind turbine was designed conceptually, the structure and size of the main components were determined, and the intact stability was checked under the combined action of wind and waves. Considering the viscous damping and second-order wave force, the hydrodynamic parameters, amplitude-frequency responses and dynamic responses were calculated and analyzed. The results show that the new semi-submersible offshore wind turbine foundation has good stability and hydrodynamic performance, especially the heave performance has been greatly improved. The wave incidence angle has little effect on heave, but has a greater effect on other degrees of freedom RAOs. Heave, roll and pitch RAOs all have a primary peak and secondary peak, but the peak period is far away from the wave energy concentration area. In addition, it is also found that the incident angle of wind and waves under different working conditions have a greater impact on the dynamic response of the wind turbine system and the mooring force. Compared with the working conditions, the wind load under extreme conditions is smaller, but the mooring force is greater.