Abstract
Thermoelastohydrodynamic characteristics of T-groove gas face seals are numerically investigated. The film pressure and temperature fields are calculated with consideration of the elastic and thermal distortions of the rings and the choked flow effect. The temperature difference between the outer radius and the inner radius is about 6K below 1.0MPa, and about 60K above 1.0MPa. Analysis results also show that a convergent gap is formed under 1.0MPa and a divergent gap is formed when the sealing pressure is larger than 1.0MPa. The thermoelastohydrodynamic effect becomes obvious and leads to significant decrease of the opening force when the sealing pressure is larger than 1.0MPa. Besides, the dynamic opening force increases with the increasing rotational speed at low sealing pressures, exceeding 2% in degree in the case of sealing 0.5MPa in the analysis, but it decreases at high pressures, exceeding 6% in degree in the case of sealing 3.0MPa. T-groove gas face seal is more suitable to be applied under conditions of low sealing pressure and high rotational speed.
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