叶尖形变与叶尖涡涡量间的关联性研究

摘要

A dynamic numerical simulation model for a horizontal axis wind turbine with a diameter of 1.4 m was established under crosswind conditions base on the unsteady fluid solid coupling algorithm,and the deformation of the blade tip and the tip vortex vorticity were obtained when the blade were in different azimuths at different incoming wind speeds. Research revealed that the deformation of the blade tip and the tip vortex vorticity showed the same trend with the changing of working conditions,and the inflow wind load was the intrinsic correlation cause of the same changing trend between the two.The inflow wind load was not the sole cause of the changing of the tip vortex vorticity, the variation of the pressure difference between the suction surface and the pressure surface caused by the blade deformation can also cause the changing of the tip vortex vorticity. Therefore the changing law between the deformation of the blade tip and the tip vortex vorticity was nonlinear.%基于非稳态流固耦合算法,针对某直径1.4m的分布式水平轴风力机建立了侧风工况下的动态数值仿真模型,获得了不同风速下、不同方位角时,叶尖形变与叶尖涡涡量值随侧风角度的变化规律.研究结果表明,叶尖形变与叶尖涡涡量值随工况而变化的趋势相同;来流风载是叶尖形变与叶尖涡涡量值发生相同变化的内在关联性诱因.研究显示,来流风载并非叶尖涡涡量值发生变化的单一诱因,叶片形变所诱发的叶片吸力面和压力面之间的压力差变化,也会造成叶尖涡涡量值的改变;叶尖形变与叶尖涡涡量值间的变化规律呈非线性特征.