Experiment Research On Active Suppression Of Rotating Stall In Axial Flow Compressor

In this paper, the study objective of the active suppression experiment is a two-stage low-speedaxial compressor. First of all, it is necessary to understand the process phenomenon of the stallinception occurrence of the compressor. Therefore an experimental study on the development processof stall has been carried on. By installing high natural frequency pressure transducers incircumferential and axial directions, this dissertation investigates the stall inception of a two-stage lowspeed axial flow compressor. Using Spectral Analysis, Wavelet Transform and S Transform dataprocessing methods, the pressure signals of inlet and outlet and inter-stage of compressor is analyzed.And analyze the compressor inlet pressure signal by Spatial Fourier Transform, the result clearlyshows the development process of the first harmonic coefficient and the second harmonic coefficient.Secondly, set up an active control system, including of the signal source which is consisted of6highnatural frequency pressure transducers located around the inlet of the compressor, the computer as thecontroller, and the actuator by means of air injection. Then, active suppression experimented on thecompressor at different rotor speeds. The result shows that active suppression extends the stabilitymargin of compressor effectively, however, it’s more effective at low-speed. Finally, activesuppression experimented on the compressor which has already stalled, by increasing the valveopening slowly and successfully made it drop out from rotating stall. The result shows that activesuppression can promote the compressor drop out from rotating stall.