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Description
Liquid hydrogen piston pumps are widely used for transferring liquid hydrogen due to their low investment, low power consumption and high flow rate. To maintain high efficiency in working condition, it is essential to prevent internal leakage. Labyrinth seals, which are a form of non-contact sealing, have a simple structure, low wear and allow for thermal deformation. They are not limited by fluid temperature and generate less friction heat. In recent years, research on labyrinth seals has primarily focused on their structural parameters, with more emphasis on testing their static sealing performance and less on the leakage of the dynamic system. This paper establishes a two-dimensional transient model of a labyrinth seal which takes into account the reciprocating motion of the piston to predict transient leakage in a liquid hydrogen piston pump. The article analyses the sealing performance of a labyrinth seal with square cavity using overlapping mesh and dynamic mesh techniques to simulate its reciprocating motion. The differences between the static and dynamic models, as well as between the labyrinth and clearance seals are compared through the simulated results. The influence of key parameters on the sealing performance is also examined. As the pressure inside the cylinder increases, the leakage rate increases. To reduce the leakage rate, it is recommended to increase the number of the square cavity and use square cavities with an appropriate length-to-height ratio.
| Submitters Country | P.R. China |
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