Based on the unsteady cooperative flow

when the exciting frequency was kept

asymmetric wake impact effect (WIE) could make better performance than the symmetric circumferential distribution.The author studied the mechanism of the asymmetric WIE.Firstly

the way of intermittent cooperative flow caused by intermittent jet in one passage was discussed to learn the trait of the intermittent cooperative flow.Secondly

a two-dimensional computational fluid dynamic (CFD) simulation of a 1/4 low speed compressor mid-span flow field was analyzed.The space-time structure of the compressor was studied.And then the asymmetric inlet guide vane (IGV) affection on that was studied.Thirdly

an experiment was designed to prove the result get from the former research.The result is the circumferential distribution of IGV decides the space-time structure of the downstream rotor flow field.The length of the excitation decides the effect of the WIE

and the dispersed IGV can improve the quantity of the space-time structure of the flow field and reduce the loss of the compressor.