The effects of stator-rotor axial spacing on the vibration stress of rotor blade were investigated by numerical simulation method. With use of the CFD program

the unsteady flow of compressor rotor blade row under the action of the wake of the front stator vanes was simulated

then structural dynamic response analysis under loading with the dynamic pressure of finite element model

which was got by interpolation procedures

was presented. Results indicate that under the examined range of axial spacing

the rotor blade vibration stress decreases with the increase of axial spacing because the wake intensity is weakening along the direction of flow

which has a great contribution to the fluctuations of pressure of blade surface.