风力机叶片挥舞/摆振的动力失速非线性气弹稳定性研究

研究动力失速风力机叶片的非线性气弹系统的稳定性。叶片结构采用具有挥舞/摆振耦合的典型截面模型,动力失速非线性气动载荷的计算采用基于半经验的ONERA非定常、非线性气动模型。为了减少由于线性化气弹稳定性分析模型带来的误差,直接采用时间域数值积分法,对叶片挥舞/摆振耦合非线性气弹方程组进行数值积分,研究叶片动力失速诱发颤振的稳定性,分析了缩减速度、预尖锥角的影响,并且针对目前文献很少报道的结构阻尼参数的影响问题进行了研究。

Flap/lead-lag nonlinear aeroelastic stability of a wind turbine blade system during dynamic stall

Here, stability of a wind turbine blade nonlinear aeroelastic system during dynamic stall was investigated.The structural model consisted of a typing blade section subjected to flap/lead-lag motion.The aerodynamic loads during dynamic stall were computed using a semi-empirical and nonlinear Onera model.To avoid errors introduced by linearization assumptions, the non-linear time domain integrals were conducted for simulations to evaluate nonlinear aeroelastic behavior of this system.A parametric study on the flutter behavior of the system was performed.The effects of the structural damping parameter not studied in most previous analyses were given.