Lubrication film flow control by oriented dimples for liquid lubricated mechanical seals

Meng, Xiangkai; Bai, Shaoxian; Peng, Xudong

doi:10.1016/j.triboint.2014.04.020

Cited by 67 publications

(40 citation statements)

References 31 publications

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“…Arauz and San Andres presented the theoretical model for cryogenic annular seals and carried out the experimental measurements of a liquid and gaseous nitrogen seal [5,6]. In other high-temperature and high-pressure working conditions, special seal testing has also been carried out, such as for the hydrostatic seal for nuclear coolant pumps and the non-contact seal for high-pressure pumps in the petrochemical industry [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Test on a Cryogenic High-Speed Hydrodynamic Non-Contact Mechanical Seal

et al. 2017

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This version is available at https://strathprints.strath.ac.uk/61655/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the Abstract The non-contact mechanical seal of a high-speed turbopump in a liquid rocket engine operates under very harsh conditions (such as rapid start-up, cryogenic, highspeed, high-pressure and low-viscosity sealing fluid). The performance of the seal is very different to the performance under normal running conditions. In this paper, for the sake of safety, an experiment is carried out with liquid nitrogen as the sealing fluid. The experimental results with liquid nitrogen are expected to provide an equivalent seal performance as would be experienced with liquid oxygen and liquid hydrogen rocket engine. The main performance parameters, including face temperatures, leakage, face friction force, and friction coefficients, are measured in the speed-up, stable, and speed-down stages. The results show that in the speed-up stage, with rapidly increasing speed, the local face temperature rises dramatically to even higher than the vaporization temperature of liquid nitrogen, and a two-phase flow phenomenon occurs. In the start-up and stable stages, the friction coefficients are 0.25 and 0.13, respectively. After the test, it was found that the wear thickness of the rotor was 0.2 mm, and serious point corrosion appeared on the surface of the stator.

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Section: Introductionmentioning

confidence: 99%

An Experimental Test on a Cryogenic High-Speed Hydrodynamic Non-Contact Mechanical Seal

et al. 2017

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“…where the individual terms in the stiffness matrix K p and k can be computed by the integration in equation 23. Equation 13combined with the JFO cavitation boundary conditions (5) is solved with a special iterative algorithm proposed in Meng et al 24 According to Stefani and Rebora, 22 the heat flows into the stator and rotor are the functions of the fluid film averaged temperature T m , and the seal end face temperature of the stator and rotor, T R R and T S S , where R and S representing the seal end faces of the rotor and stator. Based on the SUPG finite element method, the energy equation of fluid film (6) can be converted into…”

Section: Energy Equation Of the Liquid Filmmentioning

confidence: 99%

“…In equations (14) to (16), the stiffness matrix K and stiffness vector F can be computed according to the formulas stated in equations (24)…”

Section: Energy Equation Of the Liquid Filmmentioning

confidence: 99%

Thermohydrodynamic analysis on herringbone-grooved mechanical face seals with a quasi-3D model

Meng

Zhao

Shen

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part J:

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A quasi-3D thermohydrodynamic model was introduced to analyze the seal performance of a herringbone-grooved mechanical face seal. In the model, the heat conduction equations of the seal rings and the energy equation of the lubrication film were solved simultaneously by the streamline upwind/Petrov-Galerkin finite element method. The Reynolds equation and the temperature equations were iteratively solved to obtain the liquid film pressure and the temperature distribution. A parameterized study was conducted to analyze the influence of the herringbone grooves' geometry on the opening force, leakage rate, friction coefficient, and temperature rise. The results show that the hydrodynamic analysis overestimates the opening force because the viscous heat reduces the dynamic viscosity. The longer and narrower inner spiral groove gives the smaller leakage rate and the longer outer spiral groove with a smaller spiral angle shows the larger opening force.

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“…Mechanical seals are dynamic sealing devices consisting of a couple of mating rings (the rotor and stator). In addition to their already established applications in pumps and compressors [1], there is a growing demand for mechanical seals used in aerospace industry withstanding increasingly severe working conditions (e.g., high load, high temperature, and high speed) while eliminating or reducing the friction as well as the leakage rate to an acceptable level [2]. In this general trend, surface texturing, through specific patterns fabricated on sealing surface in a controllable way for hydrodynamic effect, has been proposed in tribology literature to improve the interfacial characteristics [3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the effect of typical surface texture patterns on mechanical seal performance

Shi

Wei

Wang

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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Different types of surface texture patterns such as microgrooves and microdimples have a significant effect on mechanical seal performance. However, these patterns have been studied individually for improved performance in previous publications. The purpose of this paper is to investigate the effect of microgrooves and microdimples on friction coefficient and leakage rate. The micro-textured specimens (rotor ring, 304 stainless steel) are prepared by photolithography combined with electrolytic etching technology. The stator specimens are made of silicon carbide (SiC).The experiments are conducted by using a ring-on-ring type high-speed seal test apparatus. Experimental results indicate that the friction coefficient of all textured surfaces is lower than untextured specimens with increasing area density and texture depth, but the reduction of friction is always companied with increased leakage rate. In general, the optimum area density and texture depth are around 15% and 5 µm, respectively. When the area density, S p < 10%, microgrooves result in lower friction coefficient, but when the area density exceeds 10%, elliptical dimples has the lowest friction coefficient. Moreover, microgrooves interpenetrated the inner radius of the rotor ring with α = 45° can obtain lower friction coefficient and leakage rate. These findings provide a design reference for surface texturing on practical engineering applications.

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Lubrication film flow control by oriented dimples for liquid lubricated mechanical seals

Cited by 67 publications

References 31 publications

An Experimental Test on a Cryogenic High-Speed Hydrodynamic Non-Contact Mechanical Seal

An Experimental Test on a Cryogenic High-Speed Hydrodynamic Non-Contact Mechanical Seal

Thermohydrodynamic analysis on herringbone-grooved mechanical face seals with a quasi-3D model

Experimental investigation of the effect of typical surface texture patterns on mechanical seal performance

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