Analysis of dynamic characteristics of spiral groove liquid film seal under thermal–fluid–solid coupling

Yu, Bo; Hao, Minghui; Xinhui, Sun; Wang, Zengli; Liu, Fuyu; Li, Yongfan

doi:10.1108/ilt-01-2021-0026

Cited by 5 publications

(4 citation statements)

References 24 publications

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“…Assuming convection at the boundary between the fluid film and the solid (based on the principle of energy conservation), the two-dimensional energy equation in the fluid film can be established as follows [23,24]:…”

Section: Thermal Analysis In Fluid Filmmentioning

confidence: 99%

Thermo-Fluid–Structural Coupled Analysis of a Mechanical Seal in Extended Loss of AC Power of a Reactor Coolant Pump

Park,

Hong,

Jun

et al. 2024

Lubricants

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We proposed a numerical method to investigate the thermo-fluid–structural coupled characteristics of a mechanical seal of a reactor coolant pump (RCP), especially during extended loss of AC power (ELAP) operation. We developed a finite element program for the general Reynolds equation, including the turbulence effect to calculate the pressure, opening force, and leakage rate of fluid lubricant and the two-dimensional energy equation to calculate the temperature distribution of the fluid lubricant. We verified the accuracy of the developed program by comparing the simulated temperature distribution and leakage rate of this study with those of previous research. Heat conduction and elastic deformation due to pressure and temperature changes at the seal structure were analyzed using an ANSYS program. The results showed that temperature more significantly affected the elastic deformation of the seal structure near clearance than pressure both under normal and ELAP operating conditions. High temperature and pressure of the coolant under ELAP operating conditions deform the seal structure, resulting in a much smaller clearance of the fluid film than normal operating condition. However, even with a small clearance under ELAP operation, the leakage rate slightly increases due to the high internal pressure of the coolant. This research will contribute to the development of robust mechanical seals for RCPs by accurately predicting the characteristics of mechanical seals, especially when the RCP is operating under ELAP.

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Section: Thermal Analysis In Fluid Filmmentioning

confidence: 99%

Thermo-Fluid–Structural Coupled Analysis of a Mechanical Seal in Extended Loss of AC Power of a Reactor Coolant Pump

Park,

Hong,

Jun

et al. 2024

Lubricants

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show abstract

“…Substituting the equations (4) and (5) into equations (1)–(3), the perturbation Reynolds equation considering cavitation is obtained as follows 29,30 : Substituting the perturbation in z , x and y direction into equation (6), the perturbation Reynolds equations considering cavitation in z , x and y direction are obtained as follows: …”

Section: Theoretical Modelmentioning

confidence: 99%

“…where p kj (k = z, α, β; j = i, r,) are the perturbation pressure in z, x and y direction. Substituting the equations ( 4) and ( 5) into equations ( 1)-( 3), the perturbation Reynolds equation considering cavitation is obtained as follows 29,30 :…”

Section: Mathematical Modelmentioning

confidence: 99%

Static and dynamic characteristics of a Rayleigh-steps mechanical seal with reverse steps

Wang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part J:

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This paper presents a Rayleigh-steps mechanical seal with reverse steps (RS-MS), and the governing equation was solved by the finite difference method (FDM). The effects of angular misalignment, working condition parameters, and film thickness on sealing performance were discussed, including the opening force, cavitation ratio, leakage rate, frictional torque, stiffness and damping coefficients. The results indicate that the cavitation phenomenon in the reverse step groove can restrain the leakage, while it also affects the stability of the seal. The angular misalignment makes the seal have greater stiffness and damping coefficients. The stiffness and damping coefficients decrease rapidly with the increase of the film thickness, and the dynamic stability of the mechanical seal decreases with the increase of the film thickness, which is not conducive to the stable operation of the seal. The research results can guide the optimization design of mechanical seals.

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“…Jiang et al (2019Jiang et al ( , 2020 improved the stability of dry gas seals by enhancing the film stiffness via the surface textures. Yu et al (2021) indicated that the stability of spiral groove seals can be enhanced by thermoplastic deformation. Hao et al (2018) and Yang et al (2016) conducted research on the dynamic characteristics of spiral groove seals with different groove structures, surface topographies and working conditions.…”

Section: Introductionmentioning

confidence: 99%

Analysis of dynamic characteristics of liquid-lubricated mechanical face seals with inclined elliptical grooves

Fuyu,

Bo,

Yongfan

et al. 2023

ILT

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Purpose The purpose of this paper is to study the dynamic characteristics of mechanical face seals with liquid-lubricated inclined elliptical grooves. Design/methodology/approach The steady-state and perturbation Reynolds control equations of liquid films were established. The film pressure and the liquid film dynamic coefficients were obtained, impacts of groove structures on the liquid film dynamic characteristic coefficients were analyzed. Findings The analysis results indicate that the axial dynamic stiffness and damping coefficients of the liquid film seal with inclined elliptical grooves are far greater than those of the angular directions. Furthermore, the dynamic stiffness coefficient of the liquid film with the nonclosed inclined elliptical grooves is higher than those with the closed grooves, whereas the dynamic damping coefficient of the liquid film is lower. Originality/value The effects of inclined elliptical groove structures on the dynamic characteristics of the liquid film seal are investigated. The results presented are expected to enrich the theoretical basis of optimizing the dynamic performance of liquid film seals with textures.

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Analysis of dynamic characteristics of spiral groove liquid film seal under thermal–fluid–solid coupling

Cited by 5 publications

References 24 publications

Thermo-Fluid–Structural Coupled Analysis of a Mechanical Seal in Extended Loss of AC Power of a Reactor Coolant Pump

Thermo-Fluid–Structural Coupled Analysis of a Mechanical Seal in Extended Loss of AC Power of a Reactor Coolant Pump

Static and dynamic characteristics of a Rayleigh-steps mechanical seal with reverse steps

Analysis of dynamic characteristics of liquid-lubricated mechanical face seals with inclined elliptical grooves

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