Spar风电平台涡激运动特性研究

Characteristics of Vortex-Induced Motions of Spar-Type Floating Wind Turbine

本文研究了无侧板单立柱Spar风电平台在不同约化速度(U_(r))下的涡激运动特征。基于计算流体动力学进行数值模拟,采用剪应力运输(Shear Stress Transport,SST)k-ω湍流模型模拟漩涡脱落,通过自编动力积分程序和重叠网格实现涡激运动的实时流固耦合,对U_(r)为2~14时的平台涡激运动响应进行计算,分析涡激运动模式随U_(r)演变的规律,定性分析物理模型试验不满足雷诺数(Re)相似对涡激运动结果的影响。结果显示:平台分别在U_(r)=3.5~4.5和U_(r)=5~10时发生了纵荡和横荡锁频;物理模型试验不满足Re相似,高估了平台所受的黏性力。通过数值计算得出的平台涡激运动特性可为Spar风电平台相关设计分析与试验提供参考。

The characteristics of vortex-induced motions(VIM)of a Spar-type wind turbine without helical strakes are studied under the conditions of different reduced velocities(U_(r)).Based on the computation of fluid dynamics,the vortex shedding is simulated using the k-ω turbulent model of shear stress transport(SST),and the real-time flow-solid coupling of the vortex-induced motions is realized by self-compiled dynamic integration program and overlapping grid method.Through the calculation of Spar's VIM response at reduced velocity U_(r)=2-14,the change law of the VIM mode with reduced velocity are studied,and the effect of the dissatisfying of Reynolds number similarity of the physical model tests on the calculation results of VIM is analyzed qualitatively.The results show that the Spar-type wind turbine experiences a surge and a sway frequency lock-in at U_(r)=3.5-4.5 and U_(r)=5-10,respectively;and that the dissatisfying of Reynolds number similarity of the physical model tests overestimates the viscous force suffered by the Spar.The VIM characteristics of the Spar-type wind turbine obtained by the numerical calculations can provide a reference for the design and test of the Spar-type floating wind turbine.