| Citation: | LI Yu, LIU Haibo, SUN Dan, et al. Influence of damping ring on the aeroelastic stability of labyrinth seal[J]. Journal of Aerospace Power, 2025, 40（6）：20230817 doi: 10.13224/j.cnki.jasp.20230817
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Considering the aeroelastic instability problem of the labyrinth seal of aeroengine, a model for solving the damped vibration reduction of labyrinth seal was established. Based on the energy method, the influences of the structure parameters of the damping ring and its installation position on the aeroelastic stability of the labyrinth seal were studied, and the mechanism of the influence of the damping ring on the aeroelastic stability of the labyrinth seal was revealed. The results showed that the aerodynamic damping ratio of the first mode and second mode was −0.41% and −0.049%, respectively, without the damper ring, which resulted in aeroelastic instability. However after installation of the damping ring, the aerodynamic damping ratio of the second mode changed from negative to positive, and aerodynamic damping ratio of the first mode was still negative, but the damping ratio value increased, the damping ring improved the aeroelastic stability of the labyrinth seal. When the installation interference of the damping ring was larger, the opening amount was smaller, moreover, when the aerodynamic damping ratio of the labyrinth seal was larger, the aeroelastic stability was better. When the damping ring was installed at the cantilever end, the aerodynamic damping ratio was the largest, meantime the labyrinth seal was the most stable. When the damping ring was installed at the wave node, the aerodynamic damping ratio and the amplitude reduction ratio were the smallest, and then the labyrinth seal stability was poor.
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