Frequency-domain analysis of unsteady pressure in multi-stage transonic compressor

In order to reveal the frequency spectrum structure of unsteady pressure in multi-stage transonic compressor case, three-dimensional unsteady solver has been developed based on three-dimensional Denton steady solver. Steday and Unsteady numerical simulation have been conducted on multi-stage transonic compressor near stall point, then frequency-domain analysis of unsteady pressure have been conducted on three typical radial sections. Frequency-domain research make researchers analyze the unsteady flow field from a new perspective, researchers can see some of the phenomena that are difficult to see in the time domain, such as numerical reflection at outlet. The trailing edge of stator vane will be affected by large unsteady aerodynamic force, if downstream rotor works under transonic conditions. The spectrum structure of the rear stage of the multi-stage compressor is more abundant, the amplitude component at fourfold BPF is still large, and it needs to be considered in the selection of the dynamic pressure sensor.