| Citation: | LIU Xiaoyu, WANG Zhili, DING Lei, et al. Seal performance analysis of double-faced gas film in counter-rotating intershafts[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(3): 608-614. doi: 10.13700/j.bh.1001-5965.2016.0216(in Chinese)
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The performance of a double-faced gas film seal system used in counter-rotating intershafts was analyzed. The system's two-degree-of-freedom force balance equation was established. The thickness and force of the film were calculated with finite element method. The seal system's dynamic response to seal disturbance simulated by instantaneous disturbing force and exciting force was solved with the direct numerical simulation. The vibration signal was processed by fast Fourier transform (FFT). The results show that the hydrodynamic-hydrostatic hybrid structure maintains a higher stiffness in a wider thickness range and improves the seal system performance with a good stability. When disturbed by instantaneous force, the seal system's convergence time is impacted by the mass ratio of track and sealing ring. When the exciting force's frequency is not the natural frequency, the seal system is in good stability. Exciting force with resonance frequency strengthens the vibration, increases the leakage and even damages system stability. Thus, this situation should be avoided in the design.
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