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Numerical Investigation on Static and Rotor-Dynamic Characteristics of Convergent-Tapered and Divergent-Tapered Hole-Pattern Gas Damper Seals

1
Liaoning Key Lab of Advanced Test Technology for Aerospace Propulsion System, Shenyang Aerospace University, Shenyang 110136, China
2
School of Power and Energy, Northwestern Polytechnical University, Xi’an 710072, China
3
Department of Aeronautics and Astronautics, Fudan University, Shanghai 200433, China
*
Author to whom correspondence should be addressed.
Materials 2019, 12(14), 2324; https://doi.org/10.3390/ma12142324
Received: 1 May 2019 / Revised: 12 July 2019 / Accepted: 19 July 2019 / Published: 21 July 2019
(This article belongs to the Section Advanced Materials Characterization)
To study the influence of taper seal clearance on the static and rotor-dynamic characteristics of hole-pattern damper seals, this paper develops three-dimensional transient computational fluid dynamic methods, which comprise single-frequency and multi-frequency elliptical orbit whirl model, by the transient solution combined with a mesh deformation technique. Through the investigations, it is illustrated that: (1) In the present paper, the leakage rates of convergent-tapered hole-pattern damper seals are less than divergent-tapered hole-pattern damper seals for the same average seal clearance, and the maximum relative variation reaches 16%; (2) Compared with a constant clearance hole-pattern damper seal, the maximum relative variation of the rotor-dynamic coefficients is 1,865% for nine taper degrees in this paper; (3) Convergent-tapered hole-pattern damper seals have smaller reaction forces and effective damping coefficient, larger cross-over frequency, and direct stiffness coefficient, while divergent-tapered damper seals have the opposite effects; (4) Divergent-tapered hole-pattern damper seals alleviate the rotor whirl because of a larger effective damping coefficient when the rotor system has large natural frequency and small eccentricity. Convergent-tapered damper seals provide both sealing and journal bearing capabilities at the same time, and are more advantageous to the stability of the rotor system when rotor eccentricity is the main cause of rotor instability. View Full-Text
Keywords: hole-pattern damper seals; taper seal clearance; static characteristics; rotor-dynamic characteristics; rotor stability hole-pattern damper seals; taper seal clearance; static characteristics; rotor-dynamic characteristics; rotor stability
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MDPI and ACS Style

Sun, D.; Li, S.-Y.; Zhao, H.; Fei, C.-W. Numerical Investigation on Static and Rotor-Dynamic Characteristics of Convergent-Tapered and Divergent-Tapered Hole-Pattern Gas Damper Seals. Materials 2019, 12, 2324. https://doi.org/10.3390/ma12142324

AMA Style

Sun D, Li S-Y, Zhao H, Fei C-W. Numerical Investigation on Static and Rotor-Dynamic Characteristics of Convergent-Tapered and Divergent-Tapered Hole-Pattern Gas Damper Seals. Materials. 2019; 12(14):2324. https://doi.org/10.3390/ma12142324

Chicago/Turabian Style

Sun, Dan, Sheng-Yuan Li, Huan Zhao, and Cheng-Wei Fei. 2019. "Numerical Investigation on Static and Rotor-Dynamic Characteristics of Convergent-Tapered and Divergent-Tapered Hole-Pattern Gas Damper Seals" Materials 12, no. 14: 2324. https://doi.org/10.3390/ma12142324

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