分离盘对Spar型浮式风力机涡激运动抑制特性的试验与数值研究

EXPERIMENTAL AND NUMERICAL STUDY OF SUPPRESSION EFFECT OF SPLITTER PLATE ON VORTEX-INDUCED MOTIONS OF SPAR-TYPE FLOATING OFFSHORE WIND TURBINE

涡激运动是导致浮式结构系泊系统疲劳破坏的重要原因,该文利用模型试验和数值仿真方法,开展尾侧分离盘对Spar型浮式风力机主浮体结构涡激运动抑制机理的研究。主要探讨分离盘长度L/D对风力机涡激运动特性的影响规律。研究发现,分离盘长度L/D=0时,涡激响应随折合速度的增加呈现明显的上部分支、锁定区及去同步化分支3阶段,结构发生涡激共振问题;当分离盘长度L/D≥0.2时,风力机不再发生涡激共振现象,且当分离盘长度L/D≥0.4时其抑制效果达70%以上。同时发现分离盘结构能诱发Spar型浮式风力机的艏摇运动。结果表明,分离盘对Spar型浮式风力机的涡激运动响应有明显的抑制效果。

Vortex induced motion(VIM)is an important cause for fatigue damage of the mooring system of floating structures.The present work studies the suppression effect of the splitter plate on the VIMs of the Spar-type floating offshore wind turbine(FOWT)through model tests and numerical simulations.The influences of the length of splitter plate L/D on the VIM characteristics are focused.It is found that at the splitter plate length of L/D=0,the intensification of vortex-induced responses with the increased velocity manifests three sub-stages(i.e.,upper branch,lock-in region and desynchronization)and the vortex-induced resonance occurs.When the splitter plate length is L/D≥0.2,the vortex-induced resonance does not occur anymore,and more specifically,the suppression on VIMs reaches over 70%when the splitter plate length is L/D≥0.4.It is also found that the splitter plate can induce yaw motions of the Spar-type FOWT.Results show that the splitter plate has a significant suppression effect on the VIMs of Spar-type FOWT.