极端海况下半潜式浮式风机运动响应与系泊响应

Response of mooring line and movement response of semi-submersible floating wind turbine under extreme sea conditions

以OC4-DeepCwind半潜式浮式风机为研究对象,利用ANSYS AQWA软件,通过时域耦合法模拟不同海况,在受到波浪、风、流载荷联合作用下,风机的动力响应和系泊响应,讨论极端海况对风机的影响。结果表明,与正常海况相比,极端海况下风机锚链张力的波动范围明显增大,相对最大值为正常海况下的4.98倍,影响系泊系统的稳定性;极端海况下风机卧链长度的相对最小值为正常海况下的1.75%,仅为4.21 m,与荷载作用方向一致的风机锚链变化较为剧烈,为风机的主承载锚链;极端海况下风机的纵荡、垂荡运动均有所增加,相对最大值分别为正常海况下的15.95倍、1.82倍,纵摇偏转变化到最大4.95°,其余方向变化较小,风机重心发生10.19 m的偏移,影响风机的稳定性,干扰风机的正常运行。

Taking the OC4-DeepCwind semi-submersible floating wind turbine as the research object,the paper uses ANSYS AQWA software to study the dynamic response and mooring response of OC4-DeepCwind semi-submersible floating wind turbine under the combined action of wave,wind and current loads by simulating different sea conditions through time-domain coupling method,and discusses the influence of extreme sea conditions on the wind turbine.The results show that compared with normal sea conditions,the fluctuation range of wind turbine anchor chain tension in extreme sea conditions is significantly larger,and the relative maximum value is 4.98 times that in normal sea conditions,which affects the stability of the mooring system.The minimum laid length of mooring cables under extreme sea state is1.75%of the normal sea conditions,which is only 4.21 m.The wind turbine mooring line that is consistent with the direction of load changes dramatically and it is the main bearing mooring line of the wind turbine.Under extreme sea conditions,the wind turbine’s surge and heave motions increase,and the maximum values are 15.95 times and 1.82 times of the normal ones respectively.The pitch deflection changes to the maximum of 4.95°,and the other directions change little.The center of gravity of the wind turbine shifts by 10.19 m,which affects the stability of the wind turbine and interfere with the normal operation of it.