A Parametric Study on Friction Instabilities in Mechanical Face Seals

Valigi, Maria Cristina; Braccesi, Claudio; Logozzo, Silvia

doi:10.1080/10402004.2015.1121311

Cited by 19 publications

(20 citation statements)

References 33 publications

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“…Mechanical face seals are found in many devices with rotating parts, such as pumps, blowers, mixers, and other specific equipment [1][2][3]. In this study, a mechanical face seal of an automotive cooling water pump is investigated, with a particular focus on friction instabilities [4,5].…”

Section: Introductionmentioning

confidence: 99%

A Wear Simulation Method for Mechanical Face Seals under Friction Instability Conditions

Wang

Zhang

et al. 2020

Applied Sciences

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Mechanical face seals are crucial components of automotive cooling water pumps and affect the safe operation of the pump. This article focuses on the effect of friction instabilities on the wear of the seals. Friction instabilities, such as stick-slip, occur when the axle is decelerated or operated at a low speed. Based on previous studies, a simulation model is proposed of a mechanical face seal that considers the interaction of asperities of non-Gaussian surfaces and the heat transfer between the sealing rings. According to the Archard wear equation, a numerical wear simulation is performed, and the wear distance rate and wear time rate are obtained. A comparison of the contact pressure of the Gaussian and non-Gaussian surfaces indicates that the latter is more likely to generate high contact pressure, thereby producing more significant wear. The viscous shear heat and frictional heat due to asperity contact decrease with an increase in the thickness of the tapered film. As the shaft decelerates, the wear distance rate increases with an increase in the axial stiffness. The axial damping only affects the duration of the oscillations. The wear time rate decreases with an increase in the torsional stiffness and torsional damping. The results of this research provide guidelines for estimating the wear of mechanical seals when friction instabilities occur.

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Section: Introductionmentioning

confidence: 99%

A Wear Simulation Method for Mechanical Face Seals under Friction Instability Conditions

Wang

Zhang

et al. 2020

Applied Sciences

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“…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 . In recent years, many researchers also have devoted much effort to the structural optimism of face seals …”

Section: Introductionmentioning

confidence: 99%

“…Besides, a lot of researching works have been conducted on the lubricating characteristics of mechanical face seals. 14,15 In recent years, many researchers also have devoted much effort to the structural optimism of face seals. [16][17][18][19] The sealing function of the dynamic seal part is achieved by rotating impellers, which has the similar theory with the centrifugal pump.…”

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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“…The lubricated fluid is incompressible and Reynolds equation is taken into account for smooth surfaces [26].…”

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confidence: 99%

“…Mechanical seals usually work under mixed lubrication regime. The asperities interact with each other and are in a quasi-static process so that the squeeze term can be neglected [26] in the evaluation of the fluid pressure.…”

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confidence: 99%

Lubrication and Wear Characteristics of Mechanical Face Seals under Random Vibration Loading

Wang

Zhang

et al. 2020

Materials

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The service life of mechanical face seals is related to the lubrication and wear characteristics. The stable analytical methods are commonly used, but they cannot address effects of random vibration loading, which, according to experimental studies, are important factors for lubrication and wear of mechanical face seals used in air and space vehicles. Hence, a dynamic model for mechanical face seals is proposed, with a focus on the effects of random vibration loading. The mechanical face seal in the axial direction is described as a mass-spring-damping system. Spectrum analysis specified for random vibration is then performed numerically to obtain the response power spectral density (PSD) of the mechanical face seal and calculate the root mean square (RMS) values under random vibration conditions. A lumped parameter model is then developed to examine how dynamic parameters such as stiffness and damping affect the lubrication regimes of mechanical face seals. Based on the dynamic model and Archard wear equation, a numerical wear simulation method is proposed. The results elucidated that the increase of input acceleration PSDs, the decrease of axial damping, and the increase of axial stiffness lead to the probability of the mechanical face seal operating under full film lubrication regime increase and finally the decrease of wear. This research provides a guideline for improving the adaptability of mechanical face seals under random vibration environments.

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A Parametric Study on Friction Instabilities in Mechanical Face Seals

Cited by 19 publications

References 33 publications

A Wear Simulation Method for Mechanical Face Seals under Friction Instability Conditions

A Wear Simulation Method for Mechanical Face Seals under Friction Instability Conditions

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

Lubrication and Wear Characteristics of Mechanical Face Seals under Random Vibration Loading

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