Abstract：An adaptive labyrinth seal was developed to improve traditional labyrinth seal wear-resistant capabilities in harsh conditions. A numerical model shows that the floating force is mainly generated by the uneven pressure distribution in the radial clearances of the seal. For gas seals, the hydrostatic effect caused by the pressure difference is the dominant factor for the conditions used in this study, rather than the hydrodynamic effect. The model was also used to analyze the effects of the eccentricity, the groove width and the inlet throttle length on the floating force and leakage rate. Experimental results then show that the sealing capability of this adaptive labyrinth seal is 2.3-3.1 times better than that of a traditional labyrinth seal. In addition, the sealing ring of the adaptive labyrinth seal can float for pressure differences of 0.05-0.30 MPa and responds quickly to changes in the surrounding conditions.
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2022, Vol. 62 
