Abstract
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%.
Highlights
Helium Gas T-Groove Face Seals.Thermoelastohydrodynamic problems have always played an essential role in the precise design of gas face seals [1,2,3,4,5,6] and other mechanical elements [7,8,9,10] since both thermal distortion and elastic distortion significantly affect sealing performance
When the speed is relatively low, the opening performance increases and the leakage rate decreases with increasing speed
Once the speed becomes large enough, the opening force reduces while the leakage rate increases
Summary
The influence of the gas properties on thermoelastohydrodynamic characteristics of low-temperature helium gas T-groove face seals is significantly important. Oike et al [28,29] investigated the effect of the two-phase flow caused by the decreasing pressure on the sealing performance of the floating-ring sealstemperature, at low temperature, and the experimental resultsthat showed that the leakage rate first low and the experimental results showed the leakage rate first decreases decreases and increases with of thethe increase of the two-phase flow. Film thickness, rotational speed, sealing temperatures, and sealing pressures It providessupport theoretical support for application engineeringand application and experimental of theoretical for engineering experimental research of gasresearch face seals gas face seals at low temperature
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