Experimental results show that under the effect of the rotor wake, the dominant frequencies of pressure fluctuations on stator blades are the rotor bladepassingfrequency (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。
2
These low frequency spectrum lines are basically the harmonics of the rotor shaft frequency and the blade-passingfrequency.