风浪流中涡激共振对Spar型浮式风机运动响应的影响

Effect of vortex-induced resonance on motion response of Spar-type FOWT under wind current and wave

以Spar型浮式风机为研究对象,研究涡激力对于浮式风机系统运动的影响。对多体动力学软件FAST进行二次开发,加入涡激力的计算接口,实现了在平台涡激、波激、空气动力载荷及系泊联合作用下的Spar浮式风机系统的运动响应的计算。计算了在风、浪、流联合作用下,频率锁定现象发生时,Spar基础的运动响应,分析了风浪下Spar风机运动响应的涡激运动特性,并研究了不同的入流角度的影响。结果表明:考虑涡激力后,Spar基础的横荡运动明显增大;风浪流同向时,风浪的存在会抑制流载荷引起的横荡在涡泄频率的运动;在流与风浪垂直时,会激发Spar基础的更大的纵荡运动响应。

Taking Spar-type offshore wind turbine as the object of study, the influence of vortex excited forces on the motions of floating offshore wind turbine system is studied. The calculation interface of vortex induced force is added into the software FASTv8 by second development. This enables the calculation of the kinematic response of the Spar under the combined action of vortex excited force, wave excitation force, aerodynamic load and mooring force. Under the combined action of wind, wave and current, the motion response of Spar when frequency locking occurs is calculated. Then, the characteristics of the vortex excited motion of Spar under wind and wave and the influence of different inflow angles are analyzed. The analysis shows： after considering the vortex induced forces, the sway motion of the Spar increases obviously; when the wind, wave and current are in the same direction, the addition of wind waves will suppress the motion of the sway caused by the flow load at the vortex shedding frequency; in the condition that the current is perpendicular to that in the wind and wave, the Spar is excited to produce a larger heave motion response comparing to the condition that the wind, wave and current are in the same direction.