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Modélisation numérique du comportement thermo-aéro-dynamique des garnitures d'étanchéité pour gaz réels hautes pressions

Abstract : The mechanical face seals ensure the sealing of rotating shafts. The increase in operating conditions led to the development of gas face seals functioning without face contact, separated by a thin fluid film. Friction between the ring of the face seal, and thus wear, is avoided.
The bibliographical study reveals that few work on the gas faces seals with high pressures were carried out. The characteristics of a flow at high pressure are examined and the important points of the model are defined: real gases, inertia effects, thermal effects, choked flow. With high pressures, the behaviour of the gas differs from that of a perfect gas, a real gas model is thus developed. The equation of Reynolds for a compressible fluid is modified in order to take into account the inertia effects. The thermal effects in the flow are also introduced into the model. The choked flow at the exit of fluid film is solved by an original method. The solid distortions and the thermal coupling are taken into account by the method of the influence coefficients. The finite element method is used for the discretization of the equations and an iterative algorithm allows the determination of the fields of pressure and temperature. The comparison with an analytical solution and experimental data validates the model. The influence of the model of gas is presented. The parametric study undertaken with the numerical model makes it possible to study the influence of the inertia effects on the flow compared to the dominated viscous flow. Finally, the coupling between fluid and solids is studied. This analysis shows that the face distortions influence the behaviour of the face seals.
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Contributor : Sébastien Thomas <>
Submitted on : Tuesday, June 5, 2007 - 3:22:30 PM
Last modification on : Wednesday, March 20, 2019 - 2:14:10 PM
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  • HAL Id : tel-00135573, version 2

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Sébastien Thomas. Modélisation numérique du comportement thermo-aéro-dynamique des garnitures d'étanchéité pour gaz réels hautes pressions. Autre. Université de Poitiers, 2006. Français. ⟨tel-00135573v2⟩

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