采用数值模拟方法研究了静叶尾迹的非定常流动特性,通过改变动叶与静叶之间的轴向间距和动叶的转速,结合不同工况下的等熵图,利用傅里叶变换(FFT)对动叶升力系数和阻力系数进行了频谱变换,并分析了其频谱特性与动静叶间轴向间距和动叶转速之间的关系.结果表明:随着轴向间距的增大,尾迹涡脱落频率变化不大,但功率谱密度变化较大,引起下游叶栅通道熵值增大,导致下游动叶周围能量损失增加;转速的增大使尾迹涡脱落频率增加,功率谱密度变大,同时下游叶栅通道熵值也逐渐增大,表明尾迹涡带来动叶周围更大的能量损失. The unsteady flow characteristics of stator wake are studied by numerical simulation. By changing the axial distance between rotor and stator blades and rotor speed, combining with the isentropic diagrams under different working conditions, FFT), the relationship between the spectral characteristics and the axial distance between the moving and stationary blades and the rotor blade rotation speed is analyzed.The results show that with the increase of the axial distance, the wake Vortex shedding frequency changes little, but the power spectrum density changes greatly, causing the downstream cascade channel entropy increases, resulting in downstream moving blade energy loss increases; speed increases the wake vortex off frequency increases, the power spectral density becomes larger, At the same time, the entropy of the downstream cascade channel also gradually increases, indicating that the wake vortex brings greater energy loss around the moving blades.