Theoretical and experimental study on static stability of fully partitioned pocket damper seals; ?????????????????????

Zhang, L.; Zhang, W.; Gu, Q.; Lyu, X.; Zhang, S.; Zhang, L; Zhang, W; Gu, Q; Lyu, X; Zhang, S

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Theoretical and experimental study on static stability of fully partitioned pocket damper seals; 贯通式袋型阻尼密封静态稳定性理论与实验研究

Zhang, L.; Zhang, W.; Gu, Q.; Lyu, X.; Zhang, S.

Hangkong Dongli Xuebao/Journal of Aerospace Power 41(4): 20240836

2026

ISSN/ISBN: 1000-8055

Accession: 103620294

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Summary

The stability of damper seal is one of the key factors affecting the security and stability of the turbomachinery rotor. An experimental method was proposed to identify the static stiffness coefficients for fully partitioned pocket damper seal. A fluid domain numeric model was established. And based on experiments and simulation, the static stiffness coefficient, fluid-induced force, and the static stability were studied. The results indicated that at the same eccentricity, with the increase of inlet pressure, the overall fluid-induced force increased first and then decreased, and at the same inlet pressure, with the eccentricity increasing, the static direct stiffness coefficient decreases gradually. When the inlet pressure at 0.321 MPa and the eccentricity is 0.8, the static stiffness coefficient tends to be negative, and at the choked flow condition, negative fluid-induced force and static stiffness coefficient appeared at low eccentricity. There was a pressure difference zero point in the axial pressure distribution at the large and small clearances. The pressure difference before the point produced restoring force, and after the point aggravated the rotor deviation. At the choked condition, the inertia effect caused by the sharp increase of the clearance Mach number in the outlet section was one of the reasons for the static instability.