Further study on blade interactions in counter-rotating axial flow compressor

The unsteady flow field of the counter-rotating axial flow compressor (CRAC) under design condition was time accurately simulated, the unsteady effects between every rotor and guide vane were analyzed, which contains the guide vane/rotor interaction and rotor/rotor interaction. The results indicate that the unsteady mass flow on the interface of two rotors fluctuates stronger than the other two interfaces, so the unsteady interaction between two rotors is the strongest in the CRAC. The unsteady flow field at typical height was analyzed; combined with the unsteady fluctuation intensity, the further design and mechanism of the CRAC was investigated. The unsteady fluctuation intensity increases with the flow direction, the axial distance between the second rotor and the outlet guide vane (OGV) is so short that the unsteady fluctuation intensity at the inlet of the OGV is the strongest.