Zhu Delei, Yang Jing, Bai Shaoxian
College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310023, China.
Materials (Basel). 2021 May 27;14(11):2873. doi: 10.3390/ma14112873.
Thermoelastohydrodynamic lubrication behaviors of helium gas T-groove face seals are numerically simulated under conditions of low temperature and high pressure, with the consideration of real-gas properties including compressibility coefficient, viscosity, and heat capacity. It is found that helium gas T-groove face seal presents a sharp divergent deformation at low temperature and high pressure, which makes the opening performance weaken and the leakage rate increase. This result is obviously different from the case of high-temperature gas face seals. As the sealing temperature drops from 300 K to 150 K, the leakage rate increases about 17% and the opening force decreases about 15%. Moreover, with the growth of rotational speed, both the outlet film pressure and the sealing performance present a non-monotonic trend. Specifically, while the rotating speed of moving ring raises from 3000 to 30,000 r·min-1, the leakage rate changes more than 30%, and the opening force is reduced about 10%.
考虑到包括压缩系数、粘度和热容在内的真实气体特性，对氦气T型槽端面密封在低温高压条件下的热弹流润滑行为进行了数值模拟。研究发现，氦气T型槽端面密封在低温高压下呈现出急剧的发散变形，这使得开启性能减弱，泄漏率增加。该结果与高温气体端面密封的情况明显不同。当密封温度从300K降至150K时，泄漏率增加约17%，开启力降低约15%。此外，随着转速的增加，出口膜压力和密封性能均呈现非单调趋势。具体而言，当动环转速从3000提高到30000r·min-1时，泄漏率变化超过30%，开启力降低约10%。
