Thermal analysis of mechanical face seal using analytical approach

Takami, M. Rahimi; Gerdroodbary, M. Barzegar; Ganji, D.D.

doi:10.1016/j.tsep.2017.10.023

Cited by 17 publications

(3 citation statements)

References 37 publications

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“…The reason is that the temperature difference between the outlet and inlet diameters is reduced, which makes the thermal deformation diminish. Simultaneously, it means there is a higher risk of dropping of the opening performance and contact wear failure [5,32].…”

Section: Temperature Fieldsmentioning

confidence: 99%

“…Thermoelastohydrodynamic problems have always played an essential role in the precise design of gas face seals [1][2][3][4][5][6] and other mechanical elements [7][8][9][10] since both thermal distortion and elastic distortion significantly affect sealing performance. However, with the rapid development of pre-cool technology using low-temperature and high-pressure helium gas in hypersonic engines [11,12], there arouses a new thermoelastohydrodynamic lubrication problem, where not only the face distortions [13][14][15][16] but also the real-gas properties [17,18] become nonignorable, since compressibility coefficient, viscosity, and heat capacity vary obviously with decreasing temperature.…”

Section: Introductionmentioning

confidence: 99%

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

2021

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Thermoelastohydrodynamic lubrication behaviors of helium gas T-groove face seals are numerically simulated under conditions of low temperature and high pressure, with the consideration of real-gas properties including compressibility coefficient, viscosity, and heat capacity. It is found that helium gas T-groove face seal presents a sharp divergent deformation at low temperature and high pressure, which makes the opening performance weaken and the leakage rate increase. This result is obviously different from the case of high-temperature gas face seals. As the sealing temperature drops from 300 K to 150 K, the leakage rate increases about 17% and the opening force decreases about 15%. Moreover, with the growth of rotational speed, both the outlet film pressure and the sealing performance present a non-monotonic trend. Specifically, while the rotating speed of moving ring raises from 3000 to 30,000 r·min−1, the leakage rate changes more than 30%, and the opening force is reduced about 10%.

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Section: Temperature Fieldsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2021

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“…DUAN [12] believed that due to friction and wear, the leakage of seals gradually increases over time. TAKAMI [13] used the thermal analysis method to monitor the mechanical seal and explored the influence of thermal conductivity, operating temperature, and the heat convection coefficient on the temperature distribution of the mechanical seal face. LUAN [14] conducted a heat transfer analysis on mechanical seals using fin theory to estimate the contact and surface temperatures between seal rings.…”

Section: Introductionmentioning

confidence: 99%

Tribological Behavior Characterization and Fault Detection of Mechanical Seals Based on Face Vibration Acceleration Measurements

Wang,

Song,

et al. 2023

Lubricants

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A mechanical seal is a common type of rotating shaft seal in rotating machinery and plays a key role in the fluid seal of rotating machinery, such as centrifugal pumps and compressors. Given the performance degradation caused by the wear to the face of the contact mechanical seal during operation and the lack of effective predictive maintenance monitoring methods and evaluation indexes, a method for measuring the acceleration of the mechanical seal face’s vibration was pro-posed. The influence of face performance degradation and rotational speed change on the tribo-logical regime of the mechanical seal was investigated. The proposed fault detection model based on support vector data description (SVDD) was constructed. A mechanical seal face degradation test rig verifies the usability of the proposed method. The results show that in the mixed lubrication (ML) regime, the vibration sensitivity of the face increases with the increase in rotational speed. With the decrease in the face performance, the vibration-sensitive characteristic parameters of the face in-crease and change from the ML regime to the boundary lubrication (BL) regime. The incipient fault detection model can warn about incipient faults of mechanical seals. Here, the axial detection result predicted that maintenance would be required 10.5 months earlier than the actual failure time, and the radial and axial detection results predicted required maintenance 12 months earlier than the actual failure.

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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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Thermal analysis of mechanical face seal using analytical approach

Cited by 17 publications

References 37 publications

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

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

Tribological Behavior Characterization and Fault Detection of Mechanical Seals Based on Face Vibration Acceleration Measurements

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

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