The correlation of the three excitation forms (up-stream blade rows wakes

inlet distortion and rotating stall)was studied to analyze complex flow field of the blade role. The experimental samples were obtained by a single-stage low speed axial compressor test rig.Research focused on analysis of these three types of periodical excitation

employed autocorrelation and cross-correlation approach.Experimental results show that there is high correlation between excitation signals

and the correlation degree rely heavily on even signal. In addition

there is lower amplitude of cross-correlation frequency than amplitude of autocorrelation signal;There is low magnitude correlation among three excitations

correlation mainly exist in the first two of the even degree signal.