A solution model of the rotor dynamic characteristics for taper clearance hole-pattern damper seal using unsteady transient solution combined with mesh deformation technique was established. The influences of taper degrees and whirling frequencies on the leakage rates

rotor dynamic characteristics

and suppression vibration mechanism of taper hole-pattern damper seal were studied. Results showed that

the leakage straight-through effect of the hole-pattern damper seals was enhanced by taper clearance

which increased the leakage rates. The leakage rates of convergent-clearance hole-pattern damper seals were less than the divergent-clearance hole-pattern damper seals when there was the same average seal clearance. The stiffness coefficients increased with the increase of taper degrees

while there was an opposite trend for the damping coefficients under the same whirling frequency of the rotor. The convergent-taper hole-pattern damper seals had large posi tive direct stiffness

and increased the natural frequency of rotor system

while divergent-taper hole-pattern damping seals had large negative direct stiffness. The convergent-taper hole-pattern damping seals had large effective stiffness and cross-over frequency

and small effective damping. The divergent-taper hole-pattern damper seals had large effective damping

small efective stiffness and cross-over frequency. The concentricity and the natural frequency of rotor system should be considered when design of taper clearance hole-pattern damper seals.