浮式螺旋型垂直轴风机动力响应计算研究

Dynamic response calculation investigation on a helical type floating vertical axis wind turbine

随着海上风电逐渐向深海发展,浮式风机成为了更经济的选择。浮式螺旋型风机是传统直叶片垂直轴风机的变异优化。本文针对一种三叶片5 MW浮式螺旋型垂直轴风机的动力响应进行研究。将浮式基础处理成刚体,将柔性塔柱与叶片处理成弹性体,之后基于一种松耦合方法建立整机计算模型,编写了数值求解程序。考虑随机波与湍流风,计算风浪联合作用下的风机动力响应,并与直叶片垂直轴风机进行了对比。结果表明,相较于直叶片风机,螺旋型风机可以显著减小气动转矩的波动,浮式基础的运动几乎没有区别,此外,螺旋型风机塔顶变形和叶片振动明显小于直叶片风机。

As the offshore wind power gradually moving into deeper water,floating wind turbines are considered as the more economical choices.Helical type floating wind turbine is an optimization of traditional straight-bladed vertical axis wind turbines.This paper presents the dynamic responses of a 5 MW helical type floating vertical axis wind turbine with three blades.The floating foundation is dealt with as a rigid body,and the tower and blades are considered as flexible bodies.A slack coupled modeling method is used to establish the computational model of the wind turbine system,and the numerical calculation code is programed.The dynamic responses of the wind turbine are calculated under combined turbulent wind and irregular waves,and the comparative study is conducted with straight-bladed vertical axis wind turbine.Results show that the aerodynamic torque fluctuations of the helical type wind turbine could be restrained significantly compared with the straight-bladed wind turbine,motions of floating foundation have no apparent difference.Furthermore,the deformations of the tower top point and blade of the helical type wind turbine are obviously smaller than those of the straight-bladed wind turbine.This study could provide a reference on the design of helical type floating vertical axis wind turbines.