| Citation: | YAO Minglong, ZHANG Wanfu, ZHOU Qinghui, et al. Experimental study on the dynamic characteristics of scallop damper seals[J]. Journal of Aerospace Power, 2025, 40（10）：20230774 doi: 10.13224/j.cnki.jasp.20230774
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The dynamic characteristics of scallop damper seals play a crucial role in influencing the operational stability of the system in the presence of fluid-induced excitation forces acting on the rotor. The impedance method was employed to experimentally identify the dynamic characteristic coefficients of scallop damper seals. Experiments were conducted to investigate the variations in these coefficients under different inlet pressures (0.141, 0.181 MPa) and speeds (1 800, 2 400, 3 000 r/min). The obtained findings were subjected to a comparative analysis with numerical computations derived from computational fluid dynamics (CFD). The findings showed that the numerical results agreed well with the experimental results. The numerical errors were less than 15% under variable speed and 50% under variable pressure. The experimental damping coefficient results were slightly higher than the theoretical results, while the stiffness coefficient exhibited the opposite behavior. The direct stiffness exhibited a positive correlation with rotational speed and inlet pressure, whereas it displayed a negative correlation with vortex frequency. Conversely, effective damping showed a positive correlation with inlet pressure and vortex frequency at low frequencies (
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