Study on the Rotordynamic Performance of a Novel Anti-stagnation Labyrinth Seal
- Resource Type
- Article
- Authors
- Zhang, Wanfu; Gu, Qianlei; Wang, Tengxi
- Source
- Journal of Vibration Engineering & Technologies; 20240101, Issue: Preprints p1-12, 12p
- Subject
- Language
- ISSN
- 25233920; 25233939
Purpose: A novel structure of anti-stagnation labyrinth seal was proposed in this paper. An opposed jet suppressing the circumferential flow was generated in seal cavities with pressure-driven micro-nozzles on adjacent seal teeth. Methods: The theoretical identification approach for rotordynamic coefficients based on the infinitesimal theory was applied to predict rotordynamic coefficients of annular gas seals. The effects of the layout of anti-stagnation nozzles, inlet pressure and rotational speed on rotordynamic characteristics were investigated using a computational fluid dynamics (CFD) method. Results: Compared with that of the traditional labyrinth seal, the new seal possesses better stability with a 200% increase in the effective damping coefficients at high whirling frequency. Compared with those in the middle and downstream position, nozzles installed in the upstream of the seal can effectively improve the dynamic stability of the system. Conclusions: The anti-stagnation labyrinth seal shows better stability performance for higher inlet pressure and rotational speed. The leakage flow rate of the anti-stagnation labyrinth seal is slightly higher (an increase of less than 4%) than that of the original labyrinth seal.