In order to obtain the pressure distribution inside the cavity of drum with labyrinth seal

and understand its aerodynamic characteristics

a three-dimensional model of the flow field channel of drum with labyrinth seal was developed

and the static pressure on the surface of drum with and without eccentricity between the drum and the stator was calculated. Then

the mechanics characteristics of drum under aerodynamic loads was analyzed. The simulation results show that different eccentricities complicate the surface static pressure

and change the circumferential static pressure amplitudes obviously. The amplitude of static pressure with the largest eccentricity increases 3 times compared with that without eccentricity. The maximum fluctuation of drum stress amplitude caused by circumferential static pressure considering eccentricity is about 3%.