The -D numerical simulation was employed to study the dynamic stall of the NREL S809 airfoil using the CFD software. The本文应用CFD软件Fluent 0对NRELS809翼型的二维动态流场进行了数值模拟,得到了翼型攻角在9°～ °范围内按正弦周期变化时的绕流流场。