| Citation: | WANG Junqian, ZHANG Guoyuan, ZHAO Yangyang, et al. Separation speed model and experiment of non-contact high-speed mechanical seal[J]. Journal of Aerospace Power, 2025, 40（7）：20240249 doi: 10.13224/j.cnki.jasp.20240249
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Considering a high-speed turbopump shaft end hydrodynamic non-contact mechanical seal, a new model of separation speed describing the contact state mechanism of the end face was proposed. The influences of the properties of the sealing medium, sealing pressure difference, and groove structure parameters on the separation speed were analyzed. Based on the proposed model, two types of separation sub-models for the mechanical seal with specific end face structures were established. The obtained separation speed was compared with the experimental and literature results, and the relative error was 2.96% and 4.1%. The results showed that the higher inlet pressure and viscosity of the sealing medium indicated the lower separation speed. With the increasing depth of the spiral groove, the separation speed decreased first and then increased, and the groove depth corresponding to the minimum separation speed was consistent with the thickness of the fluid film. The separation speed increased with the spiral groove ratio. As the helix angle increased, the separation speed decreased initially and then rose. The study has important theoretical and practical value for elucidating the separation transformation mechanics of non-contact mechanical seals and designing high-performance seals.
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