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The possibility to apply the active hub-flap control method,which is a proven rotating stall control method for a single-stage compressor,to a 3-stage axial compressor is experimentally discussed,where complex rotating stall inception processes are observed.The research compressor is a 3-stage one and could change the stagger angle settings for rotor blades and stator vanes.Sixteen rotor blade/stator vane configuration patterns were tested by changing stagger angle for the stator vanes.By measurement of surface-pressure fluctuation,stall inception proc- esses are investigated and the measured pressure fluctuation data is used as a predictive signal for rotating stall. The experimental results show that the stall detection system applied to active hub-flap control in a single-stage compressor could be usefully applied to that in a 3-stage compressor with a more complex stall inception process.
The possibility to apply the active hub-flap control method, which is a proven rotating stall control method for a single-stage compressor, to a 3-stage axial compressor is experimentally discussed, where complex rotating stall inception processes are observed. Research compressor is a 3-stage one and could change the stagger angle settings for rotor blades and stator vanes.Sixteen rotor blade / stator vane configuration patterns were tested by changing stagger angle for the stator vanes.By measurement of surface-pressure fluctuation, stall inception proc - esses are investigated and the measured pressure fluctuation data is used as a predictive signal for rotating stall. The experimental results show that the stall detection system applied to active hub-flap control in a single-stage compressor could be usefully applied to that in a 3-stage compressor with a more complex stall inception process.