Study of the fluid film vaporization in the interface of a mechanical face seal

Migout, F.; Brunetière, Noël; Tournerie, Bernard

doi:10.1016/j.triboint.2015.05.029

Cited by 32 publications

(14 citation statements)

References 20 publications

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“…Frictional heat is supposed to transfer through seal rings without considering heat dissipation by fluid leakage and the heat emission by radiation. 21 Deformation is investigated by thermal stress analysis, a coupled method of steady-state thermal dynamic and structural static analysis. Primary sealing interface is set as the frictional contact, and parting surface contacts are frictionless.…”

Section: Basic Settings and Loadingsmentioning

confidence: 99%

Thermomechanical coupled analysis of split mechanical seal under different rotation speeds

Sun

2016

Advances in Mechanical Engineering

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Numerical analysis is employed to investigate the influence of parting surface and combined thermal factor (rotation) on deformation of split mechanical seal. Parting surface takes little effect on the temperature distribution, verified by comparison experiment. Shaft rotation speed does not much affect the radial temperature gradient of the seal end faces but can raise the temperature when being increased. The simulated model turns to a drum, with the parting surfaces, close to the primary sealing interface presenting a convergent taper, becoming open-shaped. Increasing rotation dramatically intensifies the seal end face deformation of both split stationary and rotating seal rings and slightly increases the convergent taper size of the primary sealing interface. However, it takes little effect on the parting surface deformation. Compared with integral mechanical seal, parting surfaces distinctly reduce the primary sealing interface cone as well as the seal end face deformation of both split seal rings.

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Section: Basic Settings and Loadingsmentioning

confidence: 99%

Thermomechanical coupled analysis of split mechanical seal under different rotation speeds

Sun

2016

Advances in Mechanical Engineering

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“…Lebeck et al comprehensively described the seal mechanism and heat transfer regimes of mechanical face seals. Peng et al, Takami et al, and Migout et al theoretically analyzed the seal performance and the effect factors, whereas Zhang et al and Blasiak and Kundera used numerical methods to investigate the thermal characteristics of the face sealing ring and the dynamic properties of the seal structure. Besides, a lot of researching works have been conducted on the lubricating characteristics of mechanical face seals .…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on sealing behaviors of an extremely high‐speed two‐stage impellers structure in cryogenic rockets

Xie

et al. 2018

Asia-Pacific J Chem Eng

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Aiming at a high‐speed‐impeller mechanical seal structure that plays a significant role in the oxidant turbopump of cryogenic rocket systems, the computational fluid dynamic approach is introduced to analyze its working performance, including the phase distribution in the flow channel, the cooling effect of the frictional element, and the sealing function as well as the power consumptions of the impellers. The established periodic 3D model, which could simultaneously account for the turbulent flow, coupled heat transfer, cavitation, and evaporation, as well as the change of thermophysical properties, was successfully verified by the experimental data. The results show that the sealing ability of a totally liquid‐filled impeller would increase with increasing rotational speed, blade size, and density of the working fluid. After the rotational speed increasing over a certain value (14,000 r/min in this case), a dynamically steady gas–liquid interface would be maintained at the Impeller II's blades, which indicates the completely effective sealing of liquid. Meanwhile, the friction surface could be effectively cooled by this two‐stage leakage cooling scheme, and its maximum temperature could be stably controlled at the rated speed. Based on the good sealing performance and effective cooling, this high‐speed‐impeller seal structure was proved to be feasible and available for cryogenic rocket systems.

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“…Currently, researchers generally explain the characteristics of the mechanical seal face using the mechanism of fluid friction film formation, the exchange flow theory of boundary friction and lubrication, the dry friction mechanism and the thermohydrodynamic effect theory, etc. [6][7][8][9][10][11][12]. The above theories can only explain the mechanism of partial face sealing, while in practice, the end faces are under the joint action of friction, deformation, flowing deformation, corrosion and other factors.…”

Section: Introductionmentioning

confidence: 99%

Characteristics analysis of mechanical seal face based on thermo-hydrodynamic effect

Zhang¹,

Zhang²

2018

IJHT

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The thermo-hydrodynamic effect of the non-contact mechanical seal includes the liquid film flow characteristics and heat transfer characteristics of the seal face. It is of great practical significance to study the effects of friction and thermal deformation on the liquid film flow characteristics and heat transfer characteristics of the mechanical seal. This paper obtains the governing equation of the liquid film flow characteristics of the mechanical seal based on the momentum conservation and mass conservation equations, and then studies the thermohydrodynamic effect mechanism of the mechanical seal face through the coupling analysis of the interactions between the mechanical seal ring and the liquid film. The research results show that the mechanical seal face is deformed under the action of friction and mechanical force, and the liquid film flow characteristics of the end face changes. The liquid film pressure of the parallel flow channel increases linearly along the axial direction, and the liquid film pressure of the non-parallel flow channel exhibits a non-linear increase in a "convex" or "concave" direction; the leakage rate of the parallel flow channel is the smallest, followed by that of the convergent flow channel and then that of the divergent one. The liquid film bearing capacity of the convergent channel is the largest and that of the divergent one is the smallest. Overall, the performance of the parallel flow channel is the most stable. When the mechanical seal face is only subjected to the friction of the liquid film, the larger the angular frequency, the smaller the thickness of the liquid film, and the more heat generated by the friction. The heat transfer coefficient of the rotating ring is much greater than that of the stationary ring, so the heat absorption of the former is also significantly higher than that of the latter. The research results can provide theoretical reference for the study of the non-contact mechanical seal mechanism and the practical application of the thermo-hydrodynamic effect.

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Study of the fluid film vaporization in the interface of a mechanical face seal

Cited by 32 publications

References 20 publications

Thermomechanical coupled analysis of split mechanical seal under different rotation speeds

Thermomechanical coupled analysis of split mechanical seal under different rotation speeds

Numerical investigation on sealing behaviors of an extremely high‐speed two‐stage impellers structure in cryogenic rockets

Characteristics analysis of mechanical seal face based on thermo-hydrodynamic effect

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