Labyrinth seal vibrates as nodal diameter along the circumference, the reducing of aerodynamics damping in some mode makes the stability of the system reduced, even makes the system unstable.

• 该装置沿周向作节径型振动，在某些模态时，密封气体的气动阻尼可能为负值，使整个系统稳定性下降，甚至出现不稳定状态。