| Citation: | REN Guozhe, TANG Hongyuan, YAN Yang, et al. Study on oil flow and leakage characteristics of bearing chamber graphite sealing structure considering cavitation effect[J]. Journal of Aerospace Power, 2026, 41（4）：20240319 doi: 10.13224/j.cnki.jasp.20240319
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To investigate the impact of graphite sealing structures on the flow and leakage characteristics of lubricating oil, four slotting schemes were proposed for conventional graphite sealing structures. A comprehensive approach was employed to examine the influences of different structural parameters and working condition parameters on the flow characteristics of lubricating oil in the graphite sealing gap of bearing chambers, taking into account the cavitation effect. The results indicated that the omission of the cavitation effect led to a phenomenon where pressure was negative in the sealing gap when oil vaporisation occurred under conditions lower than the saturated vapor pressure. This was contrary to objective reality. However, the consideration of the cavitation effect eliminated this negative pressure phenomenon. Therefore, it is essential to consider cavitation when studying lubricating oil flow characteristics in a graphite sealing gap. When lubricating oil was employed as the flow medium, it was observed that the resultant force derived from case resistance and shear force, which arose from negative slotting of graphite and positive slotting of the square rotor, was directed from the sealing cavity to the bearing cavity in an axial component direction. This facilitated pumping lubricating oil into the bearing cavity, effectively inhibiting leakage and achieving a seal. Conversely, if the groove direction was opposite, the axial pumping effect could direct lubricating oil from the bearing cavity to the sealing cavity, exacerbating leakage from the bearing cavity. This situation should be avoided during the design process.
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