| Citation: | FAN Rufeng, ZHAO Huan, REN Guozhe, et al. Influence of rotor micro-texture on oil leakage flow characteristics of circular graphite seal[J]. Journal of Aerospace Power, 2025, 40（6）：20240102 doi: 10.13224/j.cnki.jasp.20240102
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Circular graphite seal structures with spiral groove, triangle groove and V-groove rotor micro-texture were designed. Numerical solution models for leakage flow characteristics of circular graphite seal with rotor micro-texture were established based on two-phase flow theory. On the basis of verifying the accuracy of numerical methods, the flow field characteristics and leakage characteristics of circular graphite seal with three rotor micro-texture were analyzed under different inlet pressures and rotor speeds. The influence of rotor micro-texture on the dynamic pressure effect and cavitation phenomenon of the circular graphite seal was studied, and the influence mechanism of rotor micro-texture on the oil leakage flow characteristics of the circular graphite seal was revealed. The results showed that with the increase of inlet pressure, the peak pressure and leakage of the rotor micro-texture circumference graphite seal increased linearly, and the gas phase volume fraction decreased. The peak pressure of the spiral groove structure was the largest, which increased by 21.37% compared with the V-groove structure. The rotor speed had great influence on the pressure peaks of the three micro-textures, but little influence on the gas phase volume fraction, with the maximum increase of 12.63%. Spiral groove structure had the best sealing performance and dynamic pressure effect, which can effectively reduce the friction and wear of graphite ring. The leakage flow characteristics of circular graphite seals can be analyzed more accurately by using the two-phase flow theory method because of the dynamic pressure effect and cavitation in the seal gap.
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