叶片扰流器对风力机性能影响的数值研究

风力发电机组不断向大型化发展,风力机叶片的长度越来越长,为满足其结构要求,需要在叶片内侧采用厚翼型,而厚翼型在大攻角下容易导致流动分离,影响功率输出。本文通过对某一风力机叶片进行数值模拟,分析其近叶根处的流场,发现存在较大的流动分离现象。针对两种工况,在叶片内侧最大弦长位置增加环形扰流器后进行数值模拟,与原始叶片进行比较。结果表明:扰流器可以有效减小叶片内侧的流动分离区域,风速为11 m/s和15 m/s时功率都得到一定程度的提高,扰流器附近截面上的压力分布也有所改善。

Numerical Simulation of Blade Spoiler Effect on Wind Turbine Performance

As the large-scale development of the wind turbine generator system,the wind turbine blade is longer and longer.In order to meet the blade structure strength requirement,thick airfoil is adopted in inboard region,which is more prone to flow separation at large angle of attack and unfavorable to power generation.In this paper,simulation of wind turbine blade was made,in which a large separated zone was observed in inboard region.Simulation of wind turbine blade adding ring spoiler in the position of the maximum chord was also performed and made comparison with the original blade.The results showed that the spoiler could efficiently reduce the flow separation in inboard region,and power generation was promoted at 11 m/s and 15 m/s.The pressure distribution around the spoiler was also better than before.