| Citation: | LIU Yong, ZHANG Jiqiang, YAN Fangchao. Self-sealing analysis of beam seal fittings in hydrogen transmission pipelines based on multi-scale contact model[J]. Journal of Aerospace Power, 2026, 41（X）：20250447 doi: 10.13224/j.cnki.jasp.20250447
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To evaluate the feasibility of beam seal fittings as connectors for aviation hydrogen pipelines, an analysis of the self-sealing performance of beam seal fittings was conducted. A multi-scale finite element model of the beam seal fitting, incorporating the surface topography characteristics of rough sealing surfaces, was established. Based on this model, simulations were performed to calculate the real contact area and contact pressure in the sealing region under various working conditions. The law of the self-sealing performance of beam seal fittings varying with preload force, sealing medium temperature, and medium pressure was investigated. The results indicated that the self-sealing performance of beam seal fittings was primarily attributed to the sealing performance of the first seal. An increase in axial preload force and sealing medium pressure enhanced the self-sealing effect and improved the sealing performance of the first seal. In contrast, the temperature of the fluid medium had no significant impact on self-sealing performance, as the sealing performance of both the first and second seals remained largely unchanged within the investigated temperature range. The findings demonstrated the stability of the sealing performance of beam seal fittings across a wide temperature range and their adaptability to high-pressure environments.
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