Experimental results show that under the effect of the rotor wake, the dominant frequencies of pressure fluctuations on stator blades are the rotor blade passing frequency (BPF) and its harmonics.
实验结果表明：在转子尾迹的影响下，静子叶片表面的波动频率是转子的尾迹频率及其倍频。
These low frequency spectrum lines are basically the harmonics of the rotor shaft frequency and the blade-passing frequency.
并且这些低频线谱基本上都是转子轴频和叶频的谐波分量。
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