破碎波作用下单桩式海上风机水动力学数值分析

Numerical Analysis of Hydrodynamic Characteristics ofMonopile-type OWT Under Breaking Wave

[目的]我国南汇、东海、大丰等海上风电场的设计波浪十分接近波浪破碎极限,需要探究浅水水域单桩式海上风机基础受破碎波载荷的动力响应。[方法]利用FAST耦合分析软件,考虑使用波浪拉伸的方式计算波浪力载荷,对单桩式风机在东海海况下的耦合动力响应特性进行分析。[结果]分析结果表明:使用波浪拉伸方式计算破碎波载荷更加接近实际海上风机所受到的载荷,且明显高于不使用拉伸方式计算的破碎波载荷。破碎波更容易激发塔筒的一阶固有频率,风浪联合作用下风机结构动力响应更加显著。[结论]研究成果为我国浅水非线性波浪区域单桩式海上风电的开发提供了一定的参考。

[Introduction]The design waves of Nanhui,Donghai and Dafeng offshore wind farms in China are all in medium water depth and very close to the breaking limit of waves,it is necessary to explore the dynamic response of monopile type offshore wind turbine foundation under breaking wave load in shallow water.[Method]In this paper,FAST full-coupling analysis software was used to calculate the hydrodynamic load by considering the method of wave stretching,the coupling dynamic response characteristics of a monopile type OWT in the East China sea were analyzed.[Result]The analysis results show that the method of wave stretching is effective in calculating the breaking wave load,which is closer to the actual breaking force of the wind turbine.The first order natural frequency of the monopile is more easily excited by the breaking wave,and the dynamic response of the structure is more remarkable under the combined action of wind and waves.[Conclusion]The research results provide a certain reference for the development of monopile type offshore wind power in shallow water nonlinear wave region in China.