Abstract: In order to validate the concept of two generations unsteady flow type-unsteady natural fow type(UNFT)and unsteady cooperative flow type(UCFT)-in axial flow compressor proposed by authors, numerical simulation and experiments are done.It can be seen from the results of numerical simulation that the space-time structure of unsteady flow would translate from chaotic state to orderly state and the time-average performance of flow field can be improved greatly when UCFT is realized.These conclusions also have been validated by our experiments of acoustical excitation and PIV measurement.

Key words: flow type, unsteady separate flow, unsteady natural flow type(UNFT), unsteady cooperative flow type(UCFT), axial flow compressor