Thermoelastohydrodynamic Characteristics of Low-Temperature Helium Gas T-Groove Face Seals

Zhu, Delei; Yang, Jinglei; Bai, Shaoxian

doi:10.3390/ma14112873

Cited by 7 publications

(2 citation statements)

References 34 publications

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“…In a study by Lin et al (2022) on ball valve oil seals for low-temperature applications, they observed variable shrinkage of the oil seal attributed to non-uniform temperature distribution from the ball valve, leading to alterations in contact characteristics. Zhu et al (2021) conducted numerical simulations of the thermal behavior of end seals at low temperatures, taking into account factors such as compression coefficient and heat capacity and identified a sharp, transient deformation of the end seals at low temperatures, resulting in an increased leakage rate.…”

Section: Introductionmentioning

confidence: 99%

Deformation mechanism and dimension optimization methods of PTFE oil seals for shafts in a wide temperature range cycle

Xing,

Zhai,

et al. 2023

ILT

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Purpose This paper aims to study the deformation mechanism of polytetrafluoroethylene (PTFE) oil seal under a wide temperature range cycle. Design/methodology/approach This study categorizes the oil seal operation into three states: assembly, heating-up and cooling. The deformation equation for the oil seal is developed for each state, considering the continuity between them. The investigation of the oil seal’s deformation trends and mechanisms is performed using the ANSYS Workbench. Findings The assembling process results in a radial shrinkage of the skeleton, causing the centroid to move toward the axis. During heating-up, the outer diameter of the skeleton slightly expands, whereas the inner diameter sharply contracts toward the axis, leading to a further reduction in the centroid’s distance from the axis. Upon cooling, both the inner and outer diameters continue to contract toward the axis, causing the centroid to persist in its movement toward the axis. Consequently, after undergoing a heating-up and cooling cycle ranging from 20°C to 180°C, the outer diameter of the PTFE oil seal reduces by 0.92 mm from its original deformation, ensuring minimal contact between the skeleton and housing. As a result of the reduced static friction torque at the skeleton, the oil seal rotates along the shaft. Originality/value The deformation mechanism of PTFE oil seals under a wide temperature range cycle was investigated, aiming to address the concerns related to the rotation along the shaft and leakage. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-05-2023-0142/

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Section: Introductionmentioning

confidence: 99%

Deformation mechanism and dimension optimization methods of PTFE oil seals for shafts in a wide temperature range cycle

Xing,

Zhai,

et al. 2023

ILT

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“…The face seal is a form of sealing widely used in aero-engines to achieve gas-liquid medium isolation in complex oil and gas working environments [1][2][3][4][5]. In order to reduce sealing wear, micro-grooves were proposed to improve sealing surfaces.…”

Section: Introductionmentioning

confidence: 99%

Gas–Liquid Mass Transfer Behavior of Upstream Pumping Mechanical Face Seals

et al. 2022

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For gas–liquid medium isolation seals in aero-engines, the upstream pumping function of directional grooves provides an effective way to realize the design of longer service life and lower leakage rate. However, this produces a new problem for gas–liquid mass transfer in the sealing clearance. This study establishes an analytical model to investigate the gas–liquid mass transfer behavior and the change rule for the opening force of mechanical face seals with elliptical grooves. Compared with traditional studies, this model considers not only the gas–liquid transfer but also the cavitation effect. The results obtained show that with the increase of rotational speed, the gas medium transferred from the inner low-pressure side to the outer high-pressure side. In addition, the leakage rate of the liquid medium from the outer high-pressure side to the inner low-pressure side increased with the growth of sealing clearance, rotational speed and seal pressure. The upstream pumping effect of the gas medium with elliptical grooves not only led to a state of gas–liquid mixed lubrication in the sealing surfaces, but also significantly increased the opening capacity of the seal face. This research may provide a reasonable basis for the design of upstream pumping mechanical face seals.

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Heat dissipation and energy transfer performance of helium face seal with spiral grooves at cryogenic condition

Yang

Chen

et al. 2023

Applied Thermal Engineering

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Thermoelastohydrodynamic Characteristics of Low-Temperature Helium Gas T-Groove Face Seals

Cited by 7 publications

References 34 publications

Deformation mechanism and dimension optimization methods of PTFE oil seals for shafts in a wide temperature range cycle

Deformation mechanism and dimension optimization methods of PTFE oil seals for shafts in a wide temperature range cycle

Gas–Liquid Mass Transfer Behavior of Upstream Pumping Mechanical Face Seals

Heat dissipation and energy transfer performance of helium face seal with spiral grooves at cryogenic condition

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